Refactor topic/comment queries to join voting data

Previously this was using a subquery, which appears to be less efficient
and is more confusing in some ways.

tildes/tildes/models/comment/comment_query.py

@@ -7,8 +7,7 @@ from typing import Any
 
 from pyramid.request import Request
 from sqlalchemy import func
-from sqlalchemy.orm import aliased
-from sqlalchemy.sql.expression import and_
+from sqlalchemy.sql.expression import and_, label
 
 from tildes.enums import CommentSortOption
 from tildes.models.pagination import PaginatedQuery
@@ -41,22 +40,16 @@ class CommentQuery(PaginatedQuery):
         return self._attach_vote_data()._attach_bookmark_data()
 
     def _attach_vote_data(self) -> "CommentQuery":
-        """Add a subquery to include whether the user has voted."""
-        vote_subquery = (
-            self.request.query(aliased(CommentVote))
-            .filter(
+        """Join the data related to whether the user has voted on the comment."""
+        query = self.join(
+            CommentVote,
+            and_(
                 CommentVote.comment_id == Comment.comment_id,
-                CommentVote.user_id == self.request.user.user_id,
-            )
-            .exists()
-            .label("user_voted")
+                CommentVote.user == self.request.user,
+            ),
+            isouter=(not self._only_user_voted),
         )
-
-        query = self.add_columns(vote_subquery)
-
-        if self._only_user_voted:
-            query = query.add_columns(CommentVote.created_time)
-            query = query.filter(vote_subquery)
+        query = query.add_columns(label("voted_time", CommentVote.created_time))
 
         return query
 
@@ -70,7 +63,9 @@ class CommentQuery(PaginatedQuery):
             ),
             isouter=(not self._only_bookmarked),
         )
-        query = query.add_columns(CommentBookmark.created_time)
+        query = query.add_columns(
+            label("bookmarked_time", CommentBookmark.created_time)
+        )
 
         return query
 
@@ -81,12 +76,11 @@ class CommentQuery(PaginatedQuery):
             # the result is already a Comment, no merging needed
             comment = result
             comment.user_voted = False
-            comment.bookmark_created_time = None
+            comment.user_bookmarked = False
         else:
             comment = result.Comment
-            comment.user_voted = result.user_voted
-
-            comment.bookmark_created_time = result.created_time
+            comment.user_voted = bool(result.voted_time)
+            comment.user_bookmarked = bool(result.bookmarked_time)
 
         return comment
 

tildes/tildes/models/topic/topic_query.py

@@ -7,8 +7,7 @@ from typing import Any, Sequence
 
 from pyramid.request import Request
 from sqlalchemy import func
-from sqlalchemy.sql.expression import and_, null
-from sqlalchemy.orm import aliased
+from sqlalchemy.sql.expression import and_, label, null
 
 from tildes.enums import TopicSortOption
 from tildes.lib.datetime import SimpleHoursPeriod, utc_now
@@ -46,22 +45,16 @@ class TopicQuery(PaginatedQuery):
         return self._attach_vote_data()._attach_visit_data()._attach_bookmark_data()
 
     def _attach_vote_data(self) -> "TopicQuery":
-        """Add a subquery to include whether the user has voted."""
-        vote_subquery = (
-            self.request.query(aliased(TopicVote))
-            .filter(
+        """Join the data related to whether the user has voted on the topic."""
+        query = self.join(
+            TopicVote,
+            and_(
                 TopicVote.topic_id == Topic.topic_id,
                 TopicVote.user == self.request.user,
+            ),
+            isouter=(not self._only_user_voted),
         )
-            .exists()
-            .label("user_voted")
-        )
-
-        query = self.add_columns(vote_subquery)
-
-        if self._only_user_voted:
-            query = query.filter(vote_subquery)
-            query = query.add_columns(TopicVote.created_time)
+        query = query.add_columns(label("voted_time", TopicVote.created_time))
 
         return query
 
@@ -75,7 +68,7 @@ class TopicQuery(PaginatedQuery):
             ),
             isouter=(not self._only_bookmarked),
         )
-        query = query.add_columns(TopicBookmark.created_time)
+        query = query.add_columns(label("bookmarked_time", TopicBookmark.created_time))
 
         return query
 
@@ -112,9 +105,8 @@ class TopicQuery(PaginatedQuery):
         else:
             topic = result.Topic
 
-            topic.user_voted = result.user_voted
-
-            topic.bookmark_created_time = result.created_time
+            topic.user_voted = bool(result.voted_time)
+            topic.user_bookmarked = bool(result.bookmarked_time)
 
             topic.last_visit_time = result.visit_time
 

tildes/tildes/templates/macros/comments.jinja2

@@ -151,7 +151,7 @@
         {% endif %}
 
         {% if request.has_permission('vote', comment) %}
-          {% if comment.user_voted is defined and comment.user_voted %}
+          {% if comment.user_voted %}
             <li><button class="btn-post-action btn-post-action-used" name="unvote"
               data-ic-delete-from="{{ request.route_url(
                 'ic_comment_vote',
@@ -204,7 +204,7 @@
         {% endif %}
 
         {% if request.has_permission('bookmark', comment) %}
-          {{ post_action_toggle_button("bookmark", comment, is_toggled=comment.bookmark_created_time) }}
+          {{ post_action_toggle_button("bookmark", comment, is_toggled=comment.user_bookmarked) }}
         {% endif %}
 
         {% if request.has_permission("remove", comment) %}

tildes/tildes/templates/topic.jinja2

@@ -153,7 +153,7 @@
     {% endif %}
 
     {% if request.has_permission('bookmark', topic) %}
-      {{ post_action_toggle_button("bookmark", topic, is_toggled=topic.bookmark_created_time) }}
+      {{ post_action_toggle_button("bookmark", topic, is_toggled=topic.user_bookmarked) }}
     {% endif %}
 
     {% if request.has_permission("remove", topic) %}