65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
import sqlalchemy as sa
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from sqlalchemy_utils import batch_fetch
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from tests import TestCase
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class TestBatchFetchManyToOneRelationships(TestCase):
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def create_models(self):
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class User(self.Base):
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__tablename__ = 'user'
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id = sa.Column(sa.Integer, autoincrement=True, primary_key=True)
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name = sa.Column(sa.Unicode(255))
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class Article(self.Base):
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__tablename__ = 'article'
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id = sa.Column(sa.Integer, primary_key=True)
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name = sa.Column(sa.Unicode(255))
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author_id = sa.Column(sa.Integer, sa.ForeignKey(User.id))
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author = sa.orm.relationship(
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User,
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backref=sa.orm.backref(
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'articles'
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)
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)
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self.User = User
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self.Article = Article
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def setup_method(self, method):
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TestCase.setup_method(self, method)
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self.users = [
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self.User(id=333, name=u'John'),
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self.User(id=334, name=u'Matt')
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]
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articles = [
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self.Article(
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id=1,
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name=u'Article 1',
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author=self.users[0]
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),
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self.Article(
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id=2,
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name=u'Article 2',
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author=self.users[1]
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),
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self.Article(
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id=3,
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name=u'Article 3'
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)
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]
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self.session.add_all(articles)
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self.session.commit()
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def test_supports_relationship_attributes(self):
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articles = self.session.query(self.Article).all()
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batch_fetch(
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articles,
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'author'
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)
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query_count = self.connection.query_count
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assert articles[0].author == self.users[0] # no lazy load should occur
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assert articles[1].author == self.users[1] # no lazy load should occur
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assert articles[2].author is None # no lazy load should occur
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assert self.connection.query_count == query_count
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