fixed follow topics number more by give number error

internal/dao/jinzhu/topics.go

@@ -75,7 +75,12 @@ func (s *topicServant) GetFollowTags(userId int64, limit int, offset int) ([]*co
 		return nil, nil
 	}
 	userTopics := []*topicInfo{}
-	err := s.db.Model(&dbr.TopicUser{}).Where("user_id=?", userId).Order("is_top DESC").Find(&userTopics).Error
+	err := s.db.Model(&dbr.TopicUser{}).
+		Where("user_id=?", userId).
+		Order("is_top DESC").
+		Limit(limit).
+		Offset(offset).
+		Find(&userTopics).Error
 	if err != nil {
 		return nil, err
 	}

internal/servants/web/loose.go

@@ -164,12 +164,12 @@ func (s *looseSrv) TopicList(req *web.TopicListReq) (*web.TopicListResp, mir.Err
 		tags, err = s.Ds.GetFollowTags(req.Uid, num, 0)
 	case web.TagTypeHotExtral:
 		extralNum := req.ExtralNum
-		if extralNum == 0 {
+		if extralNum <= 0 {
 			extralNum = num
 		}
 		tags, err = s.Ds.GetHotTags(req.Uid, num, 0)
 		if err == nil {
-			extralTags, err = s.Ds.GetFollowTags(req.Uid, num, 0)
+			extralTags, err = s.Ds.GetFollowTags(req.Uid, extralNum, 0)
 		}
 	default:
 		// TODO: return good error