subsub

resolvers/reader.py

@@ -1,7 +1,6 @@
 from typing import List
 from sqlalchemy.orm import aliased, selectinload, joinedload
 from sqlalchemy.sql import union
-from sqlalchemy.dialects.postgresql.types import sqltypes
 from sqlalchemy.sql.expression import (
     and_,
     asc,
@@ -37,6 +36,41 @@ def query_shouts():
     shout_author = aliased(ShoutAuthor)
     shout_topic = aliased(ShoutTopic)
 
+    # Подзапросы для получения уникальных авторов и тем
+    authors_subquery = (
+        select(
+            shout_author.shout.label("shout_id"),
+            func.json_agg(
+                func.json_build_object(
+                    "id", Author.id,
+                    "name", Author.name,
+                    "slug", Author.slug,
+                    "pic", Author.pic
+                )
+            ).label("authors")
+        )
+        .join(Author, Author.id == shout_author.author)
+        .group_by(shout_author.shout)
+        .alias("authors_subquery")
+    )
+
+    topics_subquery = (
+        select(
+            shout_topic.shout.label("shout_id"),
+            func.json_agg(
+                func.json_build_object(
+                    "id", Topic.id,
+                    "title", Topic.title,
+                    "body", Topic.body,
+                    "slug", Topic.slug
+                )
+            ).label("topics")
+        )
+        .join(Topic, Topic.id == shout_topic.topic)
+        .group_by(shout_topic.shout)
+        .alias("topics_subquery")
+    )
+
     # Основной запрос с подзапросами для получения статистики, авторов и тем
     q = (
         select(
@@ -50,42 +84,14 @@ def query_shouts():
                 )
             ).label("rating_stat"),
             func.max(aliased_reaction.created_at).label("last_reacted_at"),
-            func.array_agg(
+            authors_subquery.c.authors,
-                func.distinct(
+            topics_subquery.c.topics,
-                    func.json_build_object(
-                        "id",
-                        Author.id,
-                        "name",
-                        Author.name,
-                        "slug",
-                        Author.slug,
-                        "pic",
-                        Author.pic,
-                    ).cast(sqltypes.Text)  # Преобразуем JSON в текст
-                )
-            ).label("authors"),
-            func.array_agg(
-                func.distinct(
-                    func.json_build_object(
-                        "id",
-                        Topic.id,
-                        "title",
-                        Topic.title,
-                        "body",
-                        Topic.body,
-                        "slug",
-                        Topic.slug,
-                    ).cast(sqltypes.Text)  # Преобразуем JSON в текст
-                )
-            ).label("topics"),
         )
         .outerjoin(aliased_reaction, aliased_reaction.shout == Shout.id)
-        .outerjoin(shout_author, shout_author.shout == Shout.id)
+        .outerjoin(authors_subquery, authors_subquery.c.shout_id == Shout.id)
-        .outerjoin(Author, Author.id == shout_author.author)
+        .outerjoin(topics_subquery, topics_subquery.c.shout_id == Shout.id)
-        .outerjoin(shout_topic, shout_topic.shout == Shout.id)
-        .outerjoin(Topic, Topic.id == shout_topic.topic)
         .where(and_(Shout.published_at.is_not(None), Shout.deleted_at.is_(None)))
-        .group_by(Shout.id)
+        .group_by(Shout.id, authors_subquery.c.authors, topics_subquery.c.topics)
     )
 
     return q, aliased_reaction