112 lines
3.4 KiB
Python
112 lines
3.4 KiB
Python
import sqlalchemy as sa
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from sqlalchemy_utils import batch_fetch, with_backrefs
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from tests import TestCase
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class TestBatchFetchManyToManyCompositeRelationships(TestCase):
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def create_models(self):
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class Article(self.Base):
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__tablename__ = 'article'
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id1 = sa.Column(sa.Integer, primary_key=True)
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id2 = sa.Column(sa.Integer, primary_key=True)
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name = sa.Column(sa.Unicode(255))
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article_tag = sa.Table(
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'article_tag',
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self.Base.metadata,
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sa.Column(
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'article_id1',
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sa.Integer,
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),
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sa.Column(
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'article_id2',
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sa.Integer,
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),
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sa.Column(
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'tag_id1',
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sa.Integer,
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),
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sa.Column(
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'tag_id2',
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sa.Integer,
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),
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sa.ForeignKeyConstraint(
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['article_id1', 'article_id2'],
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['article.id1', 'article.id2']
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),
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sa.ForeignKeyConstraint(
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['tag_id1', 'tag_id2'],
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['tag.id1', 'tag.id2']
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)
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)
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class Tag(self.Base):
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__tablename__ = 'tag'
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id1 = sa.Column(sa.Integer, primary_key=True)
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id2 = sa.Column(sa.Integer, primary_key=True)
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name = sa.Column(sa.Unicode(255))
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articles = sa.orm.relationship(
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Article,
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secondary=article_tag,
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backref=sa.orm.backref(
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'tags',
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),
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)
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self.Article = Article
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self.Tag = Tag
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def setup_method(self, method):
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TestCase.setup_method(self, method)
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articles = [
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self.Article(id1=1, id2=2, name=u'Article 1'),
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self.Article(id1=2, id2=2, name=u'Article 2'),
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self.Article(id1=3, id2=3, name=u'Article 3'),
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self.Article(id1=4, id2=3, name=u'Article 4'),
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self.Article(id1=5, id2=3, name=u'Article 5')
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]
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self.session.add_all(articles)
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self.session.flush()
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tags = [
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self.Tag(id1=1, id2=2, name=u'Tag 1'),
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self.Tag(id1=2, id2=3, name=u'Tag 2'),
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self.Tag(id1=3, id2=4, name=u'Tag 3')
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]
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articles[0].tags = tags
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articles[3].tags = tags[1:]
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self.session.commit()
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def test_deep_relationships(self):
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articles = (
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self.session.query(self.Article)
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.order_by(self.Article.id1).all()
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)
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batch_fetch(
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articles,
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'tags'
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)
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query_count = self.connection.query_count
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assert articles[0].tags
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articles[1].tags
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assert articles[3].tags
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assert self.connection.query_count == query_count
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def test_many_to_many_backref_population(self):
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articles = (
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self.session.query(self.Article)
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.order_by(self.Article.id1).all()
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)
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batch_fetch(
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articles,
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with_backrefs('tags'),
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)
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query_count = self.connection.query_count
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tags = articles[0].tags
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tags2 = articles[3].tags
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tags[0].articles
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tags2[0].articles
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names = [article.name for article in tags[0].articles]
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assert u'Article 1' in names
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assert self.connection.query_count == query_count
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