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import sqlalchemy as sa
from sqlalchemy_utils.aggregates import aggregated
from tests import TestCase
class TestAggregateValueGenerationForSimpleModelPaths(TestCase):
def create_models(self):
class Thread(self.Base):
__tablename__ = 'thread'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
@aggregated(
'comments',
sa.Column(sa.Integer, default=0)
)
def comment_count(self):
return sa.func.count('1')
@aggregated('comments', sa.Column(sa.Integer))
def last_comment_id(self):
return sa.func.max(Comment.id)
comments = sa.orm.relationship(
'Comment',
backref='thread'
)
Thread.last_comment = sa.orm.relationship(
'Comment',
primaryjoin='Thread.last_comment_id == Comment.id',
foreign_keys=[Thread.last_comment_id],
viewonly=True
)
class Comment(self.Base):
__tablename__ = 'comment'
id = sa.Column(sa.Integer, primary_key=True)
content = sa.Column(sa.Unicode(255))
thread_id = sa.Column(sa.Integer, sa.ForeignKey('thread.id'))
self.Thread = Thread
self.Comment = Comment
def test_assigns_aggregates_on_insert(self):
thread = self.Thread()
thread.name = u'some article name'
self.session.add(thread)
comment = self.Comment(content=u'Some content', thread=thread)
self.session.add(comment)
self.session.commit()
self.session.refresh(thread)
assert thread.comment_count == 1
assert thread.last_comment_id == comment.id
def test_assigns_aggregates_on_separate_insert(self):
thread = self.Thread()
thread.name = u'some article name'
self.session.add(thread)
self.session.commit()
comment = self.Comment(content=u'Some content', thread=thread)
self.session.add(comment)
self.session.commit()
self.session.refresh(thread)
assert thread.comment_count == 1
assert thread.last_comment_id == 1
def test_assigns_aggregates_on_delete(self):
thread = self.Thread()
thread.name = u'some article name'
self.session.add(thread)
self.session.commit()
comment = self.Comment(content=u'Some content', thread=thread)
self.session.add(comment)
self.session.commit()
self.session.delete(comment)
self.session.commit()
self.session.refresh(thread)
assert thread.comment_count == 0
assert thread.last_comment_id is None
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