server/posts: make relations bidirectional

server/szurubooru/db/post.py

@@ -112,11 +112,16 @@ class Post(Base):
     # foreign tables
     user = relationship('User')
     tags = relationship('Tag', backref='posts', secondary='post_tag')
-    relations = relationship(
+    relating_to = relationship(
         'Post',
         secondary='post_relation',
         primaryjoin=post_id == PostRelation.parent_id,
         secondaryjoin=post_id == PostRelation.child_id, lazy='joined')
+    related_by = relationship(
+        'Post',
+        secondary='post_relation',
+        primaryjoin=post_id == PostRelation.child_id,
+        secondaryjoin=post_id == PostRelation.parent_id, lazy='joined')
     features = relationship(
         'PostFeature', cascade='all, delete-orphan', lazy='joined')
     scores = relationship(
@@ -190,5 +195,7 @@ class Post(Base):
 
     relation_count = column_property(
         select([func.count(PostRelation.child_id)]) \
-        .where(PostRelation.parent_id == post_id) \
+        .where(
+            (PostRelation.parent_id == post_id) \
+            | (PostRelation.child_id == post_id)) \
         .correlate_except(PostRelation))

server/szurubooru/func/posts.py

@@ -264,7 +264,7 @@ def update_post_relations(post, post_ids):
         .all()
     if len(relations) != len(post_ids):
         raise InvalidPostRelationError('One of relations does not exist.')
-    post.relations = relations
+    post.relating_to = relations
 
 def update_post_notes(post, notes):
     post.notes = []

server/szurubooru/func/snapshots.py

@@ -15,7 +15,8 @@ def get_post_snapshot(post):
         'safety': post.safety,
         'checksum': post.checksum,
         'tags': sorted([tag.first_name for tag in post.tags]),
-        'relations': sorted([rel.post_id for rel in post.relations]),
+        'relations': sorted([
+            rel.post_id for rel in post.relating_to + post.related_by]),
         'notes': sorted([{
             'polygon': note.polygon,
             'text': note.text,

server/szurubooru/search/configs/post_search_config.py

@@ -97,7 +97,8 @@ class PostSearchConfig(BaseSearchConfig):
                 defer(db.Post.tag_count),
                 subqueryload(db.Post.tags).subqueryload(db.Tag.names),
                 lazyload(db.Post.user),
-                lazyload(db.Post.relations),
+                lazyload(db.Post.relating_to),
+                lazyload(db.Post.related_by),
                 lazyload(db.Post.notes),
                 lazyload(db.Post.favorited_by),
             )

server/szurubooru/tests/db/test_post.py

@@ -19,11 +19,13 @@ def test_saving_post(post_factory, user_factory, tag_factory):
     post.user = user
     post.tags.append(tag1)
     post.tags.append(tag2)
-    post.relations.append(related_post1)
-    post.relations.append(related_post2)
+    post.relating_to.append(related_post1)
+    post.relating_to.append(related_post2)
     db.session.commit()
 
     db.session.refresh(post)
+    db.session.refresh(related_post1)
+    db.session.refresh(related_post2)
     assert not db.session.dirty
     assert post.user.user_id is not None
     assert post.safety == 'safety'
@@ -31,7 +33,12 @@ def test_saving_post(post_factory, user_factory, tag_factory):
     assert post.checksum == 'deadbeef'
     assert post.creation_time == datetime(1997, 1, 1)
     assert post.last_edit_time == datetime(1998, 1, 1)
-    assert len(post.relations) == 2
+    assert len(post.relating_to) == 2
+    assert len(related_post1.relating_to) == 0
+    assert len(related_post1.relating_to) == 0
+    assert len(post.related_by) == 0
+    assert len(related_post1.related_by) == 1
+    assert len(related_post1.related_by) == 1
 
 def test_cascade_deletions(post_factory, user_factory, tag_factory):
     user = user_factory()
@@ -66,8 +73,8 @@ def test_cascade_deletions(post_factory, user_factory, tag_factory):
     post.user = user
     post.tags.append(tag1)
     post.tags.append(tag2)
-    post.relations.append(related_post1)
-    post.relations.append(related_post2)
+    post.relating_to.append(related_post1)
+    post.relating_to.append(related_post2)
     post.scores.append(score)
     post.favorited_by.append(favorite)
     post.features.append(feature)
@@ -76,7 +83,7 @@ def test_cascade_deletions(post_factory, user_factory, tag_factory):
 
     assert not db.session.dirty
     assert post.user is not None and post.user.user_id is not None
-    assert len(post.relations) == 2
+    assert len(post.relating_to) == 2
     assert db.session.query(db.User).count() == 1
     assert db.session.query(db.Tag).count() == 2
     assert db.session.query(db.Post).count() == 3

server/szurubooru/tests/func/test_posts.py

@@ -395,9 +395,9 @@ def test_update_post_relations(post_factory):
     db.session.flush()
     post = db.Post()
     posts.update_post_relations(post, [relation1.post_id, relation2.post_id])
-    assert len(post.relations) == 2
-    assert post.relations[0].post_id == relation1.post_id
-    assert post.relations[1].post_id == relation2.post_id
+    assert len(post.relating_to) == 2
+    assert post.relating_to[0].post_id == relation1.post_id
+    assert post.relating_to[1].post_id == relation2.post_id
 
 def test_update_post_non_existing_relations():
     post = db.Post()

server/szurubooru/tests/func/test_snapshots.py

@@ -38,8 +38,8 @@ def test_serializing_post(post_factory, user_factory, tag_factory):
     post.source = 'example.com'
     post.tags.append(tag1)
     post.tags.append(tag2)
-    post.relations.append(related_post1)
-    post.relations.append(related_post2)
+    post.relating_to.append(related_post1)
+    post.relating_to.append(related_post2)
     post.scores.append(score)
     post.favorited_by.append(favorite)
     post.features.append(feature)