[questions][feat] add text search (#412)

apps/portal/prisma/migrations/20221014105030_add_question_content_search/migration.sql

@@ -0,0 +1,8 @@
+-- AlterTable
+ALTER TABLE "QuestionsQuestion" ADD COLUMN "contentSearch" TSVECTOR
+    GENERATED ALWAYS AS
+        to_tsvector('english', coalesce(content, ''))
+    STORED;
+
+-- CreateIndex
+CREATE INDEX "QuestionsQuestion_contentSearch_idx" ON "QuestionsQuestion" USING GIN("textSearch");

apps/portal/prisma/schema.prisma

@@ -414,6 +414,9 @@ model QuestionsQuestion {
   answers                    QuestionsAnswer[]
   QuestionsListQuestionEntry QuestionsListQuestionEntry[]
 
+  contentSearch Unsupported("TSVECTOR")?
+
+  @@index([contentSearch])
   @@index([lastSeenAt, id])
   @@index([upvotes, id])
 }

apps/portal/src/server/router/questions-question-router.ts

@@ -316,6 +316,31 @@ export const questionsQuestionRouter = createProtectedRouter()
       return question;
     },
   })
+  .query('getRelatedQuestionsByContent', {
+    input: z.object({
+      content: z.string(),
+    }),
+    async resolve({ ctx, input }) {
+      const escapeChars = /[()|&:*!]/g;
+
+      const query =
+        input.content
+          .replace(escapeChars, " ")
+          .trim()
+          .split(/\s+/)
+          .join(" | ");
+
+      const relatedQuestions = await ctx.prisma.$queryRaw`
+        SELECT * FROM "QuestionsQuestion"
+        WHERE
+          "contentSearch" @@ to_tsquery('english', ${query})
+        ORDER BY ts_rank("textSearch", to_tsquery('english', ${query})) DESC
+      `;
+
+      return relatedQuestions;
+    }
+
+  })
   .mutation('create', {
     input: z.object({
       companyId: z.string(),
@@ -537,7 +562,7 @@ export const questionsQuestionRouter = createProtectedRouter()
 
       const incrementValue = voteToDelete.vote === Vote.UPVOTE ? -1 : 1;
 
-      const [questionVote] = await ctx.prisma.$transaction([
+      const [ questionVote ] = await ctx.prisma.$transaction([
         ctx.prisma.questionsQuestionVote.delete({
           where: {
             id: input.id,