101 lines
3.2 KiB
Python
101 lines
3.2 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 TestBatchFetchJoinTableInheritedModels(TestCase):
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def create_models(self):
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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 TextItem(self.Base):
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__tablename__ = 'text_item'
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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(
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sa.Integer,
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sa.ForeignKey(Category.id)
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)
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type = sa.Column(sa.Unicode(255))
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__mapper_args__ = {
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'polymorphic_on': type
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}
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class Article(TextItem):
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__tablename__ = 'article'
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id = sa.Column(
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sa.Integer, sa.ForeignKey(TextItem.id), primary_key=True
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)
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__mapper_args__ = {
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'polymorphic_identity': u'article'
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}
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category = sa.orm.relationship(
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Category,
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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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class BlogPost(TextItem):
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__tablename__ = 'blog_post'
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id = sa.Column(
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sa.Integer, sa.ForeignKey(TextItem.id), primary_key=True
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)
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__mapper_args__ = {
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'polymorphic_identity': u'blog_post'
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}
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category = sa.orm.relationship(
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Category,
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backref=sa.orm.backref(
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'blog_posts'
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)
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)
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self.TextItem = TextItem
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self.Category = Category
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self.Article = Article
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self.BlogPost = BlogPost
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def setup_method(self, method):
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TestCase.setup_method(self, method)
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text_items = [
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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.BlogPost(name=u'BlogPost 1'),
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self.BlogPost(name=u'BlogPost 2'),
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self.BlogPost(name=u'BlogPost 3'),
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self.BlogPost(name=u'BlogPost 4')
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]
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self.session.add_all(text_items)
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self.session.flush()
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category = self.Category(name=u'Category #1')
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category.articles = text_items[0:2]
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category.blog_posts = text_items[4:7]
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category2 = self.Category(name=u'Category #2')
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category2.articles = text_items[2:4]
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category2.blog_posts = text_items[-1:]
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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_multiple_relationships(self):
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categories = self.session.query(self.Category).all()
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batch_fetch(
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categories,
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'articles',
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'blog_posts'
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)
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query_count = self.connection.query_count
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categories[0].articles[1]
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categories[0].blog_posts[0]
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assert self.connection.query_count == query_count
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categories[1].articles[1]
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categories[1].blog_posts[0]
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assert self.connection.query_count == query_count
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