Integrating data layer DAOs

Change-Id: I6bebf14768841f0fc9a224d933c059cfc50f9943

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/NiADatabase.kt

@@ -23,15 +23,15 @@ import com.google.samples.apps.nowinandroid.core.database.dao.AuthorDao
 import com.google.samples.apps.nowinandroid.core.database.dao.EpisodeDao
 import com.google.samples.apps.nowinandroid.core.database.dao.NewsResourceDao
 import com.google.samples.apps.nowinandroid.core.database.dao.TopicDao
+import com.google.samples.apps.nowinandroid.core.database.model.AuthorEntity
+import com.google.samples.apps.nowinandroid.core.database.model.EpisodeAuthorCrossRef
+import com.google.samples.apps.nowinandroid.core.database.model.EpisodeEntity
+import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceAuthorCrossRef
+import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceEntity
+import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceTopicCrossRef
+import com.google.samples.apps.nowinandroid.core.database.model.TopicEntity
 import com.google.samples.apps.nowinandroid.core.database.util.InstantConverter
 import com.google.samples.apps.nowinandroid.core.database.util.NewsResourceTypeConverter
-import com.google.samples.apps.nowinandroid.core.model.entities.AuthorEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.EpisodeAuthorCrossRef
-import com.google.samples.apps.nowinandroid.core.model.entities.EpisodeEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceAuthorCrossRef
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceTopicCrossRef
-import com.google.samples.apps.nowinandroid.core.model.entities.TopicEntity
 
 @Database(
     entities = [

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/dao/AuthorDao.kt

@@ -19,7 +19,7 @@ package com.google.samples.apps.nowinandroid.core.database.dao
 import androidx.room.Dao
 import androidx.room.Insert
 import androidx.room.Query
-import com.google.samples.apps.nowinandroid.core.model.entities.AuthorEntity
+import com.google.samples.apps.nowinandroid.core.database.model.AuthorEntity
 import kotlinx.coroutines.flow.Flow
 
 /**

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/dao/EpisodeDao.kt

@@ -19,8 +19,9 @@ package com.google.samples.apps.nowinandroid.core.database.dao
 import androidx.room.Dao
 import androidx.room.Insert
 import androidx.room.Query
+import com.google.samples.apps.nowinandroid.core.database.model.EpisodeEntity
+import com.google.samples.apps.nowinandroid.core.database.model.PopulatedEpisode
 import com.google.samples.apps.nowinandroid.core.model.data.Episode
-import com.google.samples.apps.nowinandroid.core.model.entities.EpisodeEntity
 import kotlinx.coroutines.flow.Flow
 
 /**
@@ -29,7 +30,7 @@ import kotlinx.coroutines.flow.Flow
 @Dao
 interface EpisodeDao {
     @Query(value = "SELECT * FROM episodes")
-    fun getEpisodesStream(): Flow<List<Episode>>
+    fun getEpisodesStream(): Flow<List<PopulatedEpisode>>
 
     @Insert
     suspend fun saveEpisodeEntities(entities: List<EpisodeEntity>)

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/dao/NewsResourceDao.kt

@@ -19,8 +19,9 @@ package com.google.samples.apps.nowinandroid.core.database.dao
 import androidx.room.Dao
 import androidx.room.Insert
 import androidx.room.Query
+import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceEntity
+import com.google.samples.apps.nowinandroid.core.database.model.PopulatedNewsResource
 import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceEntity
 import kotlinx.coroutines.flow.Flow
 
 /**
@@ -29,7 +30,7 @@ import kotlinx.coroutines.flow.Flow
 @Dao
 interface NewsResourceDao {
     @Query(value = "SELECT * FROM news_resources")
-    fun getNewsResourcesStream(): Flow<List<NewsResource>>
+    fun getNewsResourcesStream(): Flow<List<PopulatedNewsResource>>
 
     @Query(
         value = """
@@ -37,7 +38,7 @@ interface NewsResourceDao {
         WHERE id IN (:filterTopicIds)
     """
     )
-    fun getNewsResourcesStream(filterTopicIds: Set<Int>): Flow<List<NewsResource>>
+    fun getNewsResourcesStream(filterTopicIds: Set<Int>): Flow<List<PopulatedNewsResource>>
 
     @Insert
     suspend fun saveNewsResourceEntities(entities: List<NewsResourceEntity>)

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/dao/TopicDao.kt

@@ -19,7 +19,7 @@ package com.google.samples.apps.nowinandroid.core.database.dao
 import androidx.room.Dao
 import androidx.room.Insert
 import androidx.room.Query
-import com.google.samples.apps.nowinandroid.core.model.entities.TopicEntity
+import com.google.samples.apps.nowinandroid.core.database.model.TopicEntity
 import kotlinx.coroutines.flow.Flow
 
 /**

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/AuthorEntity.kt

@@ -14,12 +14,13 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.entities
+package com.google.samples.apps.nowinandroid.core.database.model
 
 import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.Index
 import androidx.room.PrimaryKey
+import com.google.samples.apps.nowinandroid.core.model.data.Author
 
 /**
  * Defines an author for either an [EpisodeEntity] or [NewsResourceEntity].
@@ -38,3 +39,9 @@ data class AuthorEntity(
     @ColumnInfo(name = "image_url")
     val imageUrl: String,
 )
+
+fun AuthorEntity.asExternalModel() = Author(
+    id = id,
+    name = name,
+    imageUrl = imageUrl,
+)

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/EpisodeAuthorCrossRef.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.entities
+package com.google.samples.apps.nowinandroid.core.database.model
 
 import androidx.room.ColumnInfo
 import androidx.room.Entity

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/EpisodeEntity.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.entities
+package com.google.samples.apps.nowinandroid.core.database.model
 
 import androidx.room.ColumnInfo
 import androidx.room.Entity

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/NewsResourceAuthorCrossRef.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.entities
+package com.google.samples.apps.nowinandroid.core.database.model
 
 import androidx.room.ColumnInfo
 import androidx.room.Entity

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/NewsResourceEntity.kt

@@ -14,12 +14,14 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.entities
+package com.google.samples.apps.nowinandroid.core.database.model
 
 import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.ForeignKey
 import androidx.room.PrimaryKey
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType
 import kotlinx.datetime.Instant
 
 /**
@@ -47,5 +49,17 @@ data class NewsResourceEntity(
     val url: String,
     @ColumnInfo(name = "publish_date")
     val publishDate: Instant,
-    val type: String,
+    val type: NewsResourceType,
+)
+
+fun NewsResourceEntity.asExternalModel() = NewsResource(
+    id = id,
+    episodeId = episodeId,
+    title = title,
+    content = content,
+    url = url,
+    publishDate = publishDate,
+    type = type,
+    authors = listOf(),
+    topics = listOf()
 )

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/NewsResourceTopicCrossRef.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.entities
+package com.google.samples.apps.nowinandroid.core.database.model
 
 import androidx.room.ColumnInfo
 import androidx.room.Entity

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/PopulatedEpisode.kt

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.database.model
+
+import androidx.room.Embedded
+import androidx.room.Junction
+import androidx.room.Relation
+import com.google.samples.apps.nowinandroid.core.model.data.Episode
+
+/**
+ * External data layer representation of an NiA episode
+ */
+data class PopulatedEpisode(
+    @Embedded
+    val entity: EpisodeEntity,
+    @Relation(
+        parentColumn = "id",
+        entityColumn = "episode_id"
+    )
+    val newsResources: List<NewsResourceEntity>,
+    @Relation(
+        parentColumn = "id",
+        entityColumn = "id",
+        associateBy = Junction(
+            value = EpisodeAuthorCrossRef::class,
+            parentColumn = "episode_id",
+            entityColumn = "author_id",
+        )
+    )
+    val authors: List<AuthorEntity>
+)
+
+fun PopulatedEpisode.asExternalModel() = Episode(
+    id = entity.id,
+    name = entity.name,
+    publishDate = entity.publishDate,
+    alternateVideo = entity.alternateVideo,
+    alternateAudio = entity.alternateAudio,
+    newsResources = newsResources.map(NewsResourceEntity::asExternalModel),
+    authors = authors.map(AuthorEntity::asExternalModel)
+)

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/PopulatedNewsResource.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.database.model
+
+import androidx.room.Embedded
+import androidx.room.Junction
+import androidx.room.Relation
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
+
+/**
+ * External data layer representation of a fully populated NiA news resource
+ */
+data class PopulatedNewsResource(
+    @Embedded
+    val entity: NewsResourceEntity,
+    @Relation(
+        parentColumn = "episode_id",
+        entityColumn = "id"
+    )
+    val episode: EpisodeEntity,
+    @Relation(
+        parentColumn = "id",
+        entityColumn = "id",
+        associateBy = Junction(
+            value = NewsResourceAuthorCrossRef::class,
+            parentColumn = "news_resource_id",
+            entityColumn = "author_id",
+        )
+    )
+    val authors: List<AuthorEntity>,
+    @Relation(
+        parentColumn = "id",
+        entityColumn = "id",
+        associateBy = Junction(
+            value = NewsResourceTopicCrossRef::class,
+            parentColumn = "news_resource_id",
+            entityColumn = "topic_id",
+        )
+    )
+    val topics: List<TopicEntity>
+)
+
+fun PopulatedNewsResource.asExternalModel() = NewsResource(
+    id = entity.id,
+    episodeId = entity.episodeId,
+    title = entity.title,
+    content = entity.content,
+    url = entity.url,
+    publishDate = entity.publishDate,
+    type = entity.type,
+    authors = authors.map(AuthorEntity::asExternalModel),
+    topics = topics.map(TopicEntity::asExternalModel)
+)

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/TopicEntity.kt

@@ -14,11 +14,12 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.entities
+package com.google.samples.apps.nowinandroid.core.database.model
 
 import androidx.room.Entity
 import androidx.room.Index
 import androidx.room.PrimaryKey
+import com.google.samples.apps.nowinandroid.core.model.data.Topic
 
 /**
  * Defines a topic a user may follow.
@@ -37,3 +38,10 @@ data class TopicEntity(
     val description: String,
     val followed: Boolean,
 )
+
+fun TopicEntity.asExternalModel() = Topic(
+    id = id,
+    name = name,
+    description = description,
+    followed = followed,
+)

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/util/Converters.kt

@@ -18,6 +18,7 @@ package com.google.samples.apps.nowinandroid.core.database.util
 
 import androidx.room.TypeConverter
 import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType
+import com.google.samples.apps.nowinandroid.core.model.data.asNewsResourceType
 import kotlinx.datetime.Instant
 
 class InstantConverter {
@@ -36,10 +37,5 @@ class NewsResourceTypeConverter {
         value?.let(NewsResourceType::name)
 
     @TypeConverter
-    fun stringToNewsResourceType(name: String?): NewsResourceType = when (name) {
+    fun stringToNewsResourceType(name: String?): NewsResourceType = name.asNewsResourceType()
-        null -> NewsResourceType.Unknown
-        else -> NewsResourceType.values()
-            .firstOrNull { type -> type.name == name }
-            ?: NewsResourceType.Unknown
-    }
 }

core-domain/build.gradle

@@ -39,11 +39,13 @@ android {
 
 dependencies {
     implementation project(':core-model')
+    implementation project(':core-database')
     implementation project(':core-datastore')
     implementation project(':core-network')
 
     testImplementation project(':core-testing')
 
+    implementation libs.kotlinx.datetime
     implementation libs.kotlinx.coroutines.android
     implementation libs.kotlinx.serialization.json
 

core-domain/src/main/java/com/google/samples/apps/nowinandroid/core/domain/model/Author.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.domain.model
+
+import com.google.samples.apps.nowinandroid.core.database.model.AuthorEntity
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkAuthor
+
+fun NetworkAuthor.asEntity() = AuthorEntity(
+    id = id,
+    name = name,
+    imageUrl = imageUrl
+)

core-domain/src/main/java/com/google/samples/apps/nowinandroid/core/domain/model/Episode.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.domain.model
+
+import com.google.samples.apps.nowinandroid.core.database.model.EpisodeEntity
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkEpisode
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkEpisodeExpanded
+
+fun NetworkEpisode.asEntity() = EpisodeEntity(
+    id = id,
+    name = name,
+    publishDate = publishDate,
+    alternateVideo = alternateVideo,
+    alternateAudio = alternateAudio,
+)
+
+fun NetworkEpisodeExpanded.asEntity() = EpisodeEntity(
+    id = id,
+    name = name,
+    publishDate = publishDate,
+    alternateVideo = alternateVideo,
+    alternateAudio = alternateAudio,
+)

core-domain/src/main/java/com/google/samples/apps/nowinandroid/core/domain/model/NewsResource.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.domain.model
+
+import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceEntity
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkNewsResource
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkNewsResourceExpanded
+
+fun NetworkNewsResource.asEntity() = NewsResourceEntity(
+    id = id,
+    episodeId = episodeId,
+    title = title,
+    content = content,
+    url = url,
+    publishDate = publishDate,
+    type = type,
+)
+
+fun NetworkNewsResourceExpanded.asEntity() = NewsResourceEntity(
+    id = id,
+    episodeId = episodeId,
+    title = title,
+    content = content,
+    url = url,
+    publishDate = publishDate,
+    type = type,
+)

core-domain/src/main/java/com/google/samples/apps/nowinandroid/core/domain/model/Topic.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.domain.model
+
+import com.google.samples.apps.nowinandroid.core.database.model.TopicEntity
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkTopic
+
+fun NetworkTopic.asEntity() = TopicEntity(
+    id = id,
+    name = name,
+    description = description,
+    followed = followed
+)

core-domain/src/main/java/com/google/samples/apps/nowinandroid/core/domain/repository/FakeTopicsRepository.kt

@@ -18,9 +18,9 @@ package com.google.samples.apps.nowinandroid.core.domain.repository
 
 import com.google.samples.apps.nowinandroid.core.datastore.NiaPreferences
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkTopic
 import com.google.samples.apps.nowinandroid.core.network.NiaDispatchers
 import com.google.samples.apps.nowinandroid.core.network.fake.FakeDataSource
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkTopic
 import javax.inject.Inject
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow

core-domain/src/test/java/com/google/samples/apps/nowinandroid/core/database/model/PopulatedEpisodeKtTest.kt

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.database.model
+
+import com.google.samples.apps.nowinandroid.core.model.data.Author
+import com.google.samples.apps.nowinandroid.core.model.data.Episode
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType.Video
+import kotlinx.datetime.Instant
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class PopulatedEpisodeKtTest {
+    @Test
+    fun populated_episode_can_be_mapped_to_episode() {
+        val populatedEpisode = PopulatedEpisode(
+            entity = EpisodeEntity(
+                id = 0,
+                name = "Test",
+                publishDate = Instant.fromEpochMilliseconds(1),
+                alternateAudio = "audio",
+                alternateVideo = "video"
+            ),
+            newsResources = listOf(
+                NewsResourceEntity(
+                    id = 1,
+                    episodeId = 0,
+                    title = "news",
+                    content = "Hilt",
+                    url = "url",
+                    type = Video,
+                    publishDate = Instant.fromEpochMilliseconds(1),
+                )
+            ),
+            authors = listOf(
+                AuthorEntity(
+                    id = 2,
+                    name = "name",
+                    imageUrl = "imageUrl"
+                )
+            ),
+        )
+        val episode = populatedEpisode.asExternalModel()
+
+        assertEquals(
+            Episode(
+                id = 0,
+                name = "Test",
+                publishDate = Instant.fromEpochMilliseconds(1),
+                alternateAudio = "audio",
+                alternateVideo = "video",
+                newsResources = listOf(
+                    NewsResource(
+                        id = 1,
+                        episodeId = 0,
+                        title = "news",
+                        content = "Hilt",
+                        url = "url",
+                        type = Video,
+                        publishDate = Instant.fromEpochMilliseconds(1),
+                        authors = listOf(),
+                        topics = listOf()
+                    )
+                ),
+                authors = listOf(
+                    Author(
+                        id = 2,
+                        name = "name",
+                        imageUrl = "imageUrl"
+                    )
+                ),
+            ),
+            episode
+        )
+    }
+}

core-domain/src/test/java/com/google/samples/apps/nowinandroid/core/database/model/PopulatedNewsResourceKtTest.kt

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.database.model
+
+import com.google.samples.apps.nowinandroid.core.model.data.Author
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType.Video
+import com.google.samples.apps.nowinandroid.core.model.data.Topic
+import kotlinx.datetime.Instant
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class PopulatedNewsResourceKtTest {
+    @Test
+    fun populated_news_resource_can_be_mapped_to_news_resource() {
+        val populatedNewsResource = PopulatedNewsResource(
+            entity = NewsResourceEntity(
+                id = 1,
+                episodeId = 0,
+                title = "news",
+                content = "Hilt",
+                url = "url",
+                type = Video,
+                publishDate = Instant.fromEpochMilliseconds(1),
+            ),
+            episode = EpisodeEntity(
+                id = 4,
+                name = "episode 4",
+                publishDate = Instant.fromEpochMilliseconds(2),
+                alternateAudio = "audio",
+                alternateVideo = "video",
+            ),
+            authors = listOf(
+                AuthorEntity(
+                    id = 2,
+                    name = "name",
+                    imageUrl = "imageUrl"
+                )
+            ),
+            topics = listOf(
+                TopicEntity(
+                    id = 3,
+                    name = "name",
+                    description = "description",
+                    followed = true,
+                )
+            ),
+        )
+        val newsResource = populatedNewsResource.asExternalModel()
+
+        assertEquals(
+            NewsResource(
+                id = 1,
+                episodeId = 0,
+                title = "news",
+                content = "Hilt",
+                url = "url",
+                type = Video,
+                publishDate = Instant.fromEpochMilliseconds(1),
+                authors = listOf(
+                    Author(
+                        id = 2,
+                        name = "name",
+                        imageUrl = "imageUrl"
+                    )
+                ),
+                topics = listOf(
+                    Topic(
+                        id = 3,
+                        name = "name",
+                        description = "description",
+                        followed = true,
+                    )
+                )
+            ),
+            newsResource
+        )
+    }
+}

core-domain/src/test/java/com/google/samples/apps/nowinandroid/core/domain/model/NetworkEntityKtTest.kt

@@ -14,16 +14,15 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model
+package com.google.samples.apps.nowinandroid.core.domain.model
-
+
-import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType.Article
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkAuthor
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkAuthor
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkEpisode
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkEpisode
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkEpisodeExpanded
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkEpisodeExpanded
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkNewsResource
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkNewsResource
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkNewsResourceExpanded
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkNewsResourceExpanded
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkTopic
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkTopic
-import com.google.samples.apps.nowinandroid.core.model.network.asEntity
 import kotlinx.datetime.Instant
 import org.junit.Assert.assertEquals
 import org.junit.Test
@@ -60,15 +59,16 @@ class NetworkEntityKtTest {
 
     @Test
     fun network_news_resource_can_be_mapped_to_news_resource_entity() {
-        val networkModel = NetworkNewsResource(
+        val networkModel =
-            id = 0,
+            NetworkNewsResource(
-            episodeId = 2,
+                id = 0,
-            title = "title",
+                episodeId = 2,
-            content = "content",
+                title = "title",
-            url = "url",
+                content = "content",
-            publishDate = Instant.fromEpochMilliseconds(1),
+                url = "url",
-            type = NewsResourceType.Article.displayText,
+                publishDate = Instant.fromEpochMilliseconds(1),
-        )
+                type = Article,
+            )
         val entity = networkModel.asEntity()
 
         assertEquals(0, entity.id)
@@ -77,17 +77,18 @@ class NetworkEntityKtTest {
         assertEquals("content", entity.content)
         assertEquals("url", entity.url)
         assertEquals(Instant.fromEpochMilliseconds(1), entity.publishDate)
-        assertEquals(NewsResourceType.Article.displayText, entity.type)
+        assertEquals(Article, entity.type)
-
+
-        val expandedNetworkModel = NetworkNewsResourceExpanded(
+        val expandedNetworkModel =
-            id = 0,
+            NetworkNewsResourceExpanded(
-            episodeId = 2,
+                id = 0,
-            title = "title",
+                episodeId = 2,
-            content = "content",
+                title = "title",
-            url = "url",
+                content = "content",
-            publishDate = Instant.fromEpochMilliseconds(1),
+                url = "url",
-            type = NewsResourceType.Article.displayText,
+                publishDate = Instant.fromEpochMilliseconds(1),
-        )
+                type = Article,
+            )
 
         val entityFromExpanded = expandedNetworkModel.asEntity()
 
@@ -97,7 +98,7 @@ class NetworkEntityKtTest {
         assertEquals("content", entityFromExpanded.content)
         assertEquals("url", entityFromExpanded.url)
         assertEquals(Instant.fromEpochMilliseconds(1), entityFromExpanded.publishDate)
-        assertEquals(NewsResourceType.Article.displayText, entityFromExpanded.type)
+        assertEquals(Article, entityFromExpanded.type)
     }
 
     @Test
@@ -117,13 +118,14 @@ class NetworkEntityKtTest {
         assertEquals("alternateAudio", entity.alternateAudio)
         assertEquals(Instant.fromEpochMilliseconds(1), entity.publishDate)
 
-        val expandedNetworkModel = NetworkEpisodeExpanded(
+        val expandedNetworkModel =
-            id = 0,
+            NetworkEpisodeExpanded(
-            name = "name",
+                id = 0,
-            publishDate = Instant.fromEpochMilliseconds(1),
+                name = "name",
-            alternateVideo = "alternateVideo",
+                publishDate = Instant.fromEpochMilliseconds(1),
-            alternateAudio = "alternateAudio",
+                alternateVideo = "alternateVideo",
-        )
+                alternateAudio = "alternateAudio",
+            )
 
         val entityFromExpanded = expandedNetworkModel.asEntity()
 

core-model/src/main/java/com/google/samples/apps/nowinandroid/core/model/data/Author.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.model.data
+
+/**
+ * External data layer representation of an NiA Author
+ */
+data class Author(
+    val id: Int,
+    val name: String,
+    val imageUrl: String,
+)

core-model/src/main/java/com/google/samples/apps/nowinandroid/core/model/data/Episode.kt

@@ -16,33 +16,17 @@
 
 package com.google.samples.apps.nowinandroid.core.model.data
 
-import androidx.room.Embedded
+import kotlinx.datetime.Instant
-import androidx.room.Junction
-import androidx.room.Relation
-import com.google.samples.apps.nowinandroid.core.model.entities.AuthorEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.EpisodeAuthorCrossRef
-import com.google.samples.apps.nowinandroid.core.model.entities.EpisodeEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceEntity
 
 /**
  * External data layer representation of an NiA episode
  */
 data class Episode(
-    @Embedded
+    val id: Int,
-    val entity: EpisodeEntity,
+    val name: String,
-    @Relation(
+    val publishDate: Instant,
-        parentColumn = "id",
+    val alternateVideo: String?,
-        entityColumn = "episode_id"
+    val alternateAudio: String?,
-    )
+    val newsResources: List<NewsResource>,
-    val newsResources: List<NewsResourceEntity>,
+    val authors: List<Author>
-    @Relation(
-        parentColumn = "id",
-        entityColumn = "id",
-        associateBy = Junction(
-            value = EpisodeAuthorCrossRef::class,
-            parentColumn = "episode_id",
-            entityColumn = "author_id",
-        )
-    )
-    val authors: List<AuthorEntity>
 )

core-model/src/main/java/com/google/samples/apps/nowinandroid/core/model/data/NewsResource.kt

@@ -16,45 +16,19 @@
 
 package com.google.samples.apps.nowinandroid.core.model.data
 
-import androidx.room.Embedded
+import kotlinx.datetime.Instant
-import androidx.room.Junction
-import androidx.room.Relation
-import com.google.samples.apps.nowinandroid.core.model.entities.AuthorEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.EpisodeEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceAuthorCrossRef
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceTopicCrossRef
-import com.google.samples.apps.nowinandroid.core.model.entities.TopicEntity
 
 /**
  * External data layer representation of a fully populated NiA news resource
  */
 data class NewsResource(
-    @Embedded
+    val id: Int,
-    val entity: NewsResourceEntity,
+    val episodeId: Int,
-    @Relation(
+    val title: String,
-        parentColumn = "episode_id",
+    val content: String,
-        entityColumn = "id"
+    val url: String,
-    )
+    val publishDate: Instant,
-    val episode: EpisodeEntity,
+    val type: NewsResourceType,
-    @Relation(
+    val authors: List<Author>,
-        parentColumn = "id",
+    val topics: List<Topic>
-        entityColumn = "id",
-        associateBy = Junction(
-            value = NewsResourceAuthorCrossRef::class,
-            parentColumn = "news_resource_id",
-            entityColumn = "author_id",
-        )
-    )
-    val authors: List<AuthorEntity>,
-    @Relation(
-        parentColumn = "id",
-        entityColumn = "id",
-        associateBy = Junction(
-            value = NewsResourceTopicCrossRef::class,
-            parentColumn = "news_resource_id",
-            entityColumn = "topic_id",
-        )
-    )
-    val topics: List<TopicEntity>
 )

core-model/src/main/java/com/google/samples/apps/nowinandroid/core/model/data/NewsResourceType.kt

@@ -20,44 +20,61 @@ package com.google.samples.apps.nowinandroid.core.model.data
  * Type for [NewsResource]
  */
 enum class NewsResourceType(
+    val serializedName: String,
     val displayText: String,
     // TODO: descriptions should probably be string resources
     val description: String
 ) {
     Video(
+        serializedName = "Video 📺",
         displayText = "Video 📺",
         description = "A video published on YouTube"
     ),
     APIChange(
+        serializedName = "API change",
         displayText = "API change",
         description = "An addition, deprecation or change to the Android platform APIs."
     ),
     Article(
+        serializedName = "Article 📚",
         displayText = "Article 📚",
         description = "An article, typically on Medium or the official Android blog"
     ),
     Codelab(
+        serializedName = "Codelab",
         displayText = "Codelab",
         description = "A new or updated codelab"
     ),
     Podcast(
+        serializedName = "Podcast 🎙",
         displayText = "Podcast 🎙",
         description = "A podcast"
     ),
     Docs(
+        serializedName = "Docs 📑",
         displayText = "Docs 📑",
         description = "A new or updated piece of documentation"
     ),
     Event(
+        serializedName = "Event 📆",
         displayText = "Event 📆",
         description = "Information about a developer event e.g. Android Developer Summit"
     ),
     DAC(
+        serializedName = "DAC",
         displayText = "DAC",
         description = "Android version features - Information about features in an Android"
     ),
     Unknown(
+        serializedName = "Unknown",
         displayText = "Unknown",
         description = "Unknown"
     )
 }
+
+fun String?.asNewsResourceType() = when (this) {
+    null -> NewsResourceType.Unknown
+    else -> NewsResourceType.values()
+        .firstOrNull { type -> type.serializedName == this }
+        ?: NewsResourceType.Unknown
+}

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/NiANetwork.kt

@@ -16,8 +16,8 @@
 
 package com.google.samples.apps.nowinandroid.core.network
 
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkNewsResource
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkNewsResource
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkTopic
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkTopic
 
 /**
  * Interface representing network calls to the NIA backend

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/fake/FakeData.kt

@@ -16,8 +16,9 @@
 
 package com.google.samples.apps.nowinandroid.core.network.fake
 
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkTopic
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType.Video
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkNewsResource
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkTopic
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkNewsResource
 import kotlinx.datetime.LocalDateTime
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.toInstant
@@ -45,7 +46,7 @@ object FakeDataSource {
             second = 0,
             nanosecond = 0
         ).toInstant(TimeZone.UTC),
-        type = "Video \uD83D\uDCFA",
+        type = Video,
         topics = listOf(0),
     )
 

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/fake/FakeNiANetwork.kt

@@ -16,10 +16,10 @@
 
 package com.google.samples.apps.nowinandroid.core.network.fake
 
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkNewsResource
-import com.google.samples.apps.nowinandroid.core.model.network.NetworkTopic
 import com.google.samples.apps.nowinandroid.core.network.NiANetwork
 import com.google.samples.apps.nowinandroid.core.network.NiaDispatchers
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkNewsResource
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkTopic
 import javax.inject.Inject
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.Serializable

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/model/NetworkAuthor.kt

@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.network
+package com.google.samples.apps.nowinandroid.core.network.model
 
-import com.google.samples.apps.nowinandroid.core.model.entities.AuthorEntity
+import com.google.samples.apps.nowinandroid.core.model.data.Author
 import kotlinx.serialization.Serializable
 
 /**
- * Network representation of [AuthorEntity]
+ * Network representation of [Author]
  */
 @Serializable
 data class NetworkAuthor(
@@ -28,9 +28,3 @@ data class NetworkAuthor(
     val name: String,
     val imageUrl: String,
 )
-
-fun NetworkAuthor.asEntity() = AuthorEntity(
-    id = id,
-    name = name,
-    imageUrl = imageUrl
-)

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/model/NetworkEpisode.kt

@@ -14,19 +14,18 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.network
+package com.google.samples.apps.nowinandroid.core.network.model
 
-import androidx.room.PrimaryKey
+import com.google.samples.apps.nowinandroid.core.model.data.Episode
-import com.google.samples.apps.nowinandroid.core.model.entities.EpisodeEntity
+import com.google.samples.apps.nowinandroid.core.network.model.util.InstantSerializer
 import kotlinx.datetime.Instant
 import kotlinx.serialization.Serializable
 
 /**
- * Network representation of [EpisodeEntity] when fetched from /networkepisodes
+ * Network representation of [Episode] when fetched from /episodes
  */
 @Serializable
 data class NetworkEpisode(
-    @PrimaryKey
     val id: Int,
     val name: String,
     @Serializable(InstantSerializer::class)
@@ -38,11 +37,10 @@ data class NetworkEpisode(
 )
 
 /**
- * Network representation of [EpisodeEntity] when fetched from /networkepisodes{id}
+ * Network representation of [Episode] when fetched from /episodes/{id}
  */
 @Serializable
 data class NetworkEpisodeExpanded(
-    @PrimaryKey
     val id: Int,
     val name: String,
     @Serializable(InstantSerializer::class)
@@ -52,19 +50,3 @@ data class NetworkEpisodeExpanded(
     val newsResources: List<NetworkNewsResource> = listOf(),
     val authors: List<NetworkAuthor> = listOf(),
 )
-
-fun NetworkEpisode.asEntity() = EpisodeEntity(
-    id = id,
-    name = name,
-    publishDate = publishDate,
-    alternateVideo = alternateVideo,
-    alternateAudio = alternateAudio,
-)
-
-fun NetworkEpisodeExpanded.asEntity() = EpisodeEntity(
-    id = id,
-    name = name,
-    publishDate = publishDate,
-    alternateVideo = alternateVideo,
-    alternateAudio = alternateAudio,
-)

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/model/NetworkNewsResource.kt

@@ -14,14 +14,17 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.network
+package com.google.samples.apps.nowinandroid.core.network.model
 
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceEntity
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType
+import com.google.samples.apps.nowinandroid.core.network.model.util.InstantSerializer
+import com.google.samples.apps.nowinandroid.core.network.model.util.NewsResourceTypeSerializer
 import kotlinx.datetime.Instant
 import kotlinx.serialization.Serializable
 
 /**
- * Network representation of [NewsResourceEntity] when fetched from /networkresources
+ * Network representation of [NewsResource] when fetched from /newsresources
  */
 @Serializable
 data class NetworkNewsResource(
@@ -32,13 +35,14 @@ data class NetworkNewsResource(
     val url: String,
     @Serializable(InstantSerializer::class)
     val publishDate: Instant,
-    val type: String,
+    @Serializable(NewsResourceTypeSerializer::class)
+    val type: NewsResourceType,
     val authors: List<Int> = listOf(),
     val topics: List<Int> = listOf(),
 )
 
 /**
- * Network representation of [NewsResourceEntity] when fetched from /networkresources{id}
+ * Network representation of [NewsResource] when fetched from /newsresources/{id}
  */
 @Serializable
 data class NetworkNewsResourceExpanded(
@@ -49,27 +53,8 @@ data class NetworkNewsResourceExpanded(
     val url: String,
     @Serializable(InstantSerializer::class)
     val publishDate: Instant,
-    val type: String,
+    @Serializable(NewsResourceTypeSerializer::class)
+    val type: NewsResourceType,
     val authors: List<NetworkAuthor> = listOf(),
     val topics: List<NetworkTopic> = listOf(),
 )
-
-fun NetworkNewsResource.asEntity() = NewsResourceEntity(
-    id = id,
-    episodeId = episodeId,
-    title = title,
-    content = content,
-    url = url,
-    publishDate = publishDate,
-    type = type,
-)
-
-fun NetworkNewsResourceExpanded.asEntity() = NewsResourceEntity(
-    id = id,
-    episodeId = episodeId,
-    title = title,
-    content = content,
-    url = url,
-    publishDate = publishDate,
-    type = type,
-)

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/model/NetworkTopic.kt

@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.network
+package com.google.samples.apps.nowinandroid.core.network.model
 
-import com.google.samples.apps.nowinandroid.core.model.entities.TopicEntity
+import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import kotlinx.serialization.Serializable
 
 /**
- * Network representation of [TopicEntity]
+ * Network representation of [Topic]
  */
 @Serializable
 data class NetworkTopic(
@@ -29,10 +29,3 @@ data class NetworkTopic(
     val description: String = "",
     val followed: Boolean = false,
 )
-
-fun NetworkTopic.asEntity() = TopicEntity(
-    id = id,
-    name = name,
-    description = description,
-    followed = followed
-)

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/model/util/InstantSerializer.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.model.network
+package com.google.samples.apps.nowinandroid.core.network.model.util
 
 import kotlinx.datetime.Instant
 import kotlinx.datetime.toInstant

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/model/util/NewsResourceTypeSerializer.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.network.model.util
+
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType
+import com.google.samples.apps.nowinandroid.core.model.data.asNewsResourceType
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.descriptors.PrimitiveKind.STRING
+import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+
+object NewsResourceTypeSerializer : KSerializer<NewsResourceType> {
+    override fun deserialize(decoder: Decoder): NewsResourceType =
+        decoder.decodeString().asNewsResourceType()
+
+    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor(
+        serialName = "type",
+        kind = STRING
+    )
+
+    override fun serialize(encoder: Encoder, value: NewsResourceType) =
+        encoder.encodeString(value.name)
+}

core-ui/src/main/java/com/google/samples/apps/nowinandroid/core/ui/NewsResourceCard.kt

@@ -37,11 +37,10 @@ import androidx.compose.ui.semantics.onClick
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
+import com.google.samples.apps.nowinandroid.core.model.data.Author
 import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
-import com.google.samples.apps.nowinandroid.core.model.entities.AuthorEntity
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType.Article
-import com.google.samples.apps.nowinandroid.core.model.entities.EpisodeEntity
+import com.google.samples.apps.nowinandroid.core.model.data.Topic
-import com.google.samples.apps.nowinandroid.core.model.entities.NewsResourceEntity
-import com.google.samples.apps.nowinandroid.core.model.entities.TopicEntity
 import com.google.samples.apps.nowinandroid.core.ui.theme.NiaTheme
 import kotlinx.datetime.Instant
 
@@ -59,12 +58,12 @@ fun NewsResourceCardExpanded(
         modifier = Modifier.padding(16.dp)
     ) {
         Row {
-            NewsResourceTitle(newsResource.entity.title, modifier = Modifier.fillMaxWidth((.8f)))
+            NewsResourceTitle(newsResource.title, modifier = Modifier.fillMaxWidth((.8f)))
             Spacer(modifier = Modifier.weight(1f))
             BookmarkButton(isBookmarked, onToggleBookmark)
         }
         Spacer(modifier = Modifier.height(12.dp))
-        NewsResourceShortDescription(newsResource.entity.content)
+        NewsResourceShortDescription(newsResource.content)
     }
 }
 
@@ -174,31 +173,22 @@ fun ExpandedNewsResourcePreview() {
 }
 
 private val newsResource = NewsResource(
-    NewsResourceEntity(
+    id = 1,
-        id = 1,
+    episodeId = 1,
-        episodeId = 1,
+    title = "Title",
-        title = "Title",
+    content = "Content",
-        content = "Content",
+    url = "url",
-        url = "url",
+    publishDate = Instant.DISTANT_FUTURE,
-        publishDate = Instant.DISTANT_FUTURE,
+    type = Article,
-        type = "type",
+    authors = listOf(
-    ),
+        Author(
-    EpisodeEntity(
-        id = 1,
-        name = "Title",
-        publishDate = Instant.DISTANT_FUTURE,
-        alternateVideo = "alternateVideo",
-        alternateAudio = "alternateAudio",
-    ),
-    listOf(
-        AuthorEntity(
             id = 1,
             name = "Name",
             imageUrl = "imageUrl"
         )
     ),
-    listOf(
+    topics = listOf(
-        TopicEntity(
+        Topic(
             id = 1,
             name = "Name",
             description = "Description",

feature-following/src/test/java/com/google/samples/apps/nowinandroid/following/FollowingViewModelTest.kt

@@ -145,6 +145,7 @@ private val testOutputTopics = listOf(
     Topic(
         id = 2,
         name = TOPIC_3_NAME,
-        description = TOPIC_DESC
+        description = TOPIC_DESC,
+        followed = false,
     )
 )

feature-foryou/src/test/java/com/google/samples/apps/nowinandroid/feature/foryou/ForYouViewModelTest.kt

@@ -109,7 +109,7 @@ class ForYouViewModelTest {
                             Topic(
                                 id = 2,
                                 name = "Tools",
-                                description = ""
+                                description = "",
                             ) to false
                         ),
                         feed = emptyList()