server/posts: fix relations bidirectionality
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				@ -288,6 +288,9 @@ def import_post_relations(unused_post_ids, v1_session, v2_session):
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        v2_session.add(
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            db.PostRelation(
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                parent_id=row['post1id'], child_id=row['post2id']))
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        v2_session.add(
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            db.PostRelation(
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                parent_id=row['post2id'], child_id=row['post1id']))
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    v2_session.commit()
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def import_post_favorites(unused_post_ids, v1_session, v2_session):
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@ -112,16 +112,11 @@ class Post(Base):
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    # foreign tables
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    user = relationship('User')
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    tags = relationship('Tag', backref='posts', secondary='post_tag')
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    relating_to = relationship(
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    relations = relationship(
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        'Post',
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        secondary='post_relation',
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        primaryjoin=post_id == PostRelation.parent_id,
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        secondaryjoin=post_id == PostRelation.child_id, lazy='joined')
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    related_by = relationship(
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        'Post',
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        secondary='post_relation',
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        primaryjoin=post_id == PostRelation.child_id,
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        secondaryjoin=post_id == PostRelation.parent_id, lazy='joined')
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    features = relationship(
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        'PostFeature', cascade='all, delete-orphan', lazy='joined')
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    scores = relationship(
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@ -94,8 +94,7 @@ def serialize_post(post, authenticated_user, options=None):
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                {
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                    post['id']:
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                        post for post in [
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                            serialize_micro_post(rel) \
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                                for rel in post.related_by + post.relating_to
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                            serialize_micro_post(rel) for rel in post.relations
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                        ]
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                }.values(),
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                key=lambda post: post['id']),
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@ -258,14 +257,24 @@ def update_post_tags(post, tag_names):
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    existing_tags, new_tags = tags.get_or_create_tags_by_names(tag_names)
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    post.tags = existing_tags + new_tags
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def update_post_relations(post, post_ids):
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    relations = db.session \
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def update_post_relations(post, new_post_ids):
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    old_posts = post.relations
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    old_post_ids = [p.post_id for p in old_posts]
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    new_posts = db.session \
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        .query(db.Post) \
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        .filter(db.Post.post_id.in_(post_ids)) \
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        .filter(db.Post.post_id.in_(new_post_ids)) \
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        .all()
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    if len(relations) != len(post_ids):
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    if len(new_posts) != len(new_post_ids):
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        raise InvalidPostRelationError('One of relations does not exist.')
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    post.relating_to = relations
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    relations_to_del = [p for p in old_posts if p.post_id not in new_post_ids]
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    relations_to_add = [p for p in new_posts if p.post_id not in old_post_ids]
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    for relation in relations_to_del:
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        post.relations.remove(relation)
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        relation.relations.remove(post)
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    for relation in relations_to_add:
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        post.relations.append(relation)
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        relation.relations.append(post)
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def update_post_notes(post, notes):
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    post.notes = []
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@ -16,7 +16,7 @@ def get_post_snapshot(post):
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        'checksum': post.checksum,
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        'tags': sorted([tag.first_name for tag in post.tags]),
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        'relations': sorted([
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            rel.post_id for rel in post.relating_to + post.related_by]),
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            rel.post_id for rel in post.relations]),
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        'notes': sorted([{
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            'polygon': note.polygon,
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            'text': note.text,
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@ -97,8 +97,7 @@ class PostSearchConfig(BaseSearchConfig):
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                defer(db.Post.tag_count),
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                subqueryload(db.Post.tags).subqueryload(db.Tag.names),
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                lazyload(db.Post.user),
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                lazyload(db.Post.relating_to),
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                lazyload(db.Post.related_by),
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                lazyload(db.Post.relations),
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                lazyload(db.Post.notes),
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                lazyload(db.Post.favorited_by),
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            )
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@ -19,8 +19,8 @@ def test_saving_post(post_factory, user_factory, tag_factory):
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    post.user = user
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    post.tags.append(tag1)
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    post.tags.append(tag2)
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    post.relating_to.append(related_post1)
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    post.relating_to.append(related_post2)
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    post.relations.append(related_post1)
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    post.relations.append(related_post2)
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    db.session.commit()
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    db.session.refresh(post)
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@ -33,12 +33,10 @@ def test_saving_post(post_factory, user_factory, tag_factory):
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    assert post.checksum == 'deadbeef'
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    assert post.creation_time == datetime(1997, 1, 1)
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    assert post.last_edit_time == datetime(1998, 1, 1)
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    assert len(post.relating_to) == 2
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    assert len(related_post1.relating_to) == 0
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    assert len(related_post1.relating_to) == 0
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    assert len(post.related_by) == 0
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    assert len(related_post1.related_by) == 1
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    assert len(related_post1.related_by) == 1
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    assert len(post.relations) == 2
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    # relation bidirectionality is realized on business level in func.posts
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    assert len(related_post1.relations) == 0
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    assert len(related_post2.relations) == 0
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def test_cascade_deletions(post_factory, user_factory, tag_factory):
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    user = user_factory()
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@ -73,8 +71,8 @@ def test_cascade_deletions(post_factory, user_factory, tag_factory):
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    post.user = user
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    post.tags.append(tag1)
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    post.tags.append(tag2)
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    post.relating_to.append(related_post1)
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    post.relating_to.append(related_post2)
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    post.relations.append(related_post1)
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    post.relations.append(related_post2)
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    post.scores.append(score)
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    post.favorited_by.append(favorite)
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    post.features.append(feature)
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@ -83,7 +81,7 @@ def test_cascade_deletions(post_factory, user_factory, tag_factory):
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    assert not db.session.dirty
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    assert post.user is not None and post.user.user_id is not None
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    assert len(post.relating_to) == 2
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    assert len(post.relations) == 2
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    assert db.session.query(db.User).count() == 1
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    assert db.session.query(db.Tag).count() == 2
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    assert db.session.query(db.Post).count() == 3
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@ -394,11 +394,22 @@ def test_update_post_relations(post_factory):
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    relation2 = post_factory()
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    db.session.add_all([relation1, relation2])
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    db.session.flush()
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    post = db.Post()
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    post = post_factory()
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    posts.update_post_relations(post, [relation1.post_id, relation2.post_id])
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    assert len(post.relating_to) == 2
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    assert post.relating_to[0].post_id == relation1.post_id
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    assert post.relating_to[1].post_id == relation2.post_id
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    assert len(post.relations) == 2
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    assert post.relations[0].post_id == relation1.post_id
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    assert post.relations[1].post_id == relation2.post_id
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def test_relation_bidirectionality(post_factory):
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    relation1 = post_factory()
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    relation2 = post_factory()
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    db.session.add_all([relation1, relation2])
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    db.session.flush()
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    post = post_factory()
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    posts.update_post_relations(post, [relation1.post_id, relation2.post_id])
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    posts.update_post_relations(relation1, [])
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    assert len(post.relations) == 1
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    assert post.relations[0].post_id == relation2.post_id
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def test_update_post_non_existing_relations():
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    post = db.Post()
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@ -38,8 +38,8 @@ def test_serializing_post(post_factory, user_factory, tag_factory):
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    post.source = 'example.com'
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    post.tags.append(tag1)
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    post.tags.append(tag2)
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    post.relating_to.append(related_post1)
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    post.relating_to.append(related_post2)
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    post.relations.append(related_post1)
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    post.relations.append(related_post2)
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    post.scores.append(score)
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    post.favorited_by.append(favorite)
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    post.features.append(feature)
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