79 lines
2.8 KiB
Python
79 lines
2.8 KiB
Python
import sqlalchemy as sa
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from pytest import raises
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from sqlalchemy_utils import batch_fetch
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from tests import TestCase
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class TestBatchFetchOneToManyRelationships(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 Category(self.Base):
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__tablename__ = 'category'
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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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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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category_id = sa.Column(sa.Integer, sa.ForeignKey(Category.id))
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category = sa.orm.relationship(
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Category,
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primaryjoin=category_id == Category.id,
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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.Category = Category
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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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articles = [
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self.Article(name=u'Article 1'),
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self.Article(name=u'Article 2'),
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self.Article(name=u'Article 3'),
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self.Article(name=u'Article 4'),
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self.Article(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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category = self.Category(name=u'Category #1')
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category.articles = articles[0:2]
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category2 = self.Category(name=u'Category #2')
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category2.articles = articles[2:]
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self.session.add(category)
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self.session.add(category2)
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self.session.commit()
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def test_raises_error_if_relationship_not_found(self):
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categories = self.session.query(self.Category).all()
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with raises(AttributeError):
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batch_fetch(categories, 'unknown_relation')
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def test_supports_relationship_attributes(self):
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categories = self.session.query(self.Category).all()
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batch_fetch(categories, self.Category.articles)
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query_count = self.connection.query_count
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articles = categories[0].articles # no lazy load should occur
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assert len(articles) == 2
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article_names = [article.name for article in articles]
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assert 'Article 1' in article_names
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assert 'Article 2' in article_names
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articles = categories[1].articles # no lazy load should occur
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assert len(articles) == 3
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article_names = [article.name for article in articles]
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assert 'Article 3' in article_names
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assert 'Article 4' in article_names
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assert 'Article 5' in article_names
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assert self.connection.query_count == query_count
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