90 lines
2.7 KiB
Python
90 lines
2.7 KiB
Python
import warnings
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import sqlalchemy as sa
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.ext.hybrid import hybrid_property
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from sqlalchemy_utils import InstrumentedList, coercion_listener, aggregates
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@sa.event.listens_for(sa.engine.Engine, 'before_cursor_execute')
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def count_sql_calls(conn, cursor, statement, parameters, context, executemany):
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try:
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conn.query_count += 1
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except AttributeError:
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conn.query_count = 0
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warnings.simplefilter('error', sa.exc.SAWarning)
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sa.event.listen(sa.orm.mapper, 'mapper_configured', coercion_listener)
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class TestCase(object):
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dns = 'sqlite:///:memory:'
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def setup_method(self, method):
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self.engine = create_engine(self.dns)
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#self.engine.echo = True
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self.connection = self.engine.connect()
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self.Base = declarative_base()
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self.create_models()
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self.Base.metadata.create_all(self.connection)
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Session = sessionmaker(bind=self.connection)
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self.session = Session()
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def teardown_method(self, method):
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aggregates.generator.reset()
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self.session.close_all()
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self.Base.metadata.drop_all(self.connection)
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self.connection.close()
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self.engine.dispose()
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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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@hybrid_property
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def articles_count(self):
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return len(self.articles)
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@articles_count.expression
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def articles_count(cls):
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return (
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sa.select([sa.func.count(self.Article.id)])
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.where(self.Article.category_id == self.Category.id)
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.correlate(self.Article.__table__)
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.label('article_count')
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)
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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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collection_class=InstrumentedList
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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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