[questions][feat] add text search

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

@@ -374,6 +374,10 @@ model QuestionsQuestion {
     votes      QuestionsQuestionVote[]
     comments   QuestionsQuestionComment[]
     answers    QuestionsAnswer[]
+
+    contentSearch Unsupported("TSVECTOR")?
+
+    @@index([contentSearch])
 }
 
 model QuestionsQuestionEncounter {

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

@@ -182,6 +182,31 @@ export const questionsQuestionRouter = createProtectedRouter()
       return question;
     },
   })
+  .query('getRelatedQuestionsByContent', {
+    input: z.object({
+      content: z.string(),
+      pageNum: z.number(),
+      pageSize: z.number(),
+    }),
+    async resolve({ ctx, input }) {
+      const escapeChars = /[()|&:*!]/g;
+
+      const query =
+        input.content
+          .replace(escapeChars, " ")
+          .trim()
+          .split(/\s+/)
+          .join(" | ");
+
+      const res = await ctx.prisma.$queryRaw`
+        SELECT content FROM "Post"
+        WHERE
+          "contentSearch" @@ to_tsquery('english', ${query})
+        ORDER BY ts_rank("textSearch", to_tsquery('english', ${query})) DESC
+        LIMIT 10;
+      `;
+    }
+  })
   .mutation('create', {
     input: z.object({
       company: z.string(),