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import warnings
import sqlalchemy as sa
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base, synonym_for
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.orm import sessionmaker
from sqlalchemy_utils import (
aggregates,
coercion_listener,
i18n,
InstrumentedList
)
from sqlalchemy_utils.types.pg_composite import remove_composite_listeners
@sa.event.listens_for(sa.engine.Engine, 'before_cursor_execute')
def count_sql_calls(conn, cursor, statement, parameters, context, executemany):
try:
conn.query_count += 1
except AttributeError:
conn.query_count = 0
warnings.simplefilter('error', sa.exc.SAWarning)
sa.event.listen(sa.orm.mapper, 'mapper_configured', coercion_listener)
def get_locale():
class Locale():
territories = {'FI': 'Finland'}
return Locale()
class TestCase(object):
dns = 'sqlite:///:memory:'
create_tables = True
def setup_method(self, method):
self.engine = create_engine(self.dns)
# self.engine.echo = True
self.connection = self.engine.connect()
self.Base = declarative_base()
self.create_models()
sa.orm.configure_mappers()
if self.create_tables:
self.Base.metadata.create_all(self.connection)
Session = sessionmaker(bind=self.connection)
self.session = Session()
i18n.get_locale = get_locale
def teardown_method(self, method):
aggregates.manager.reset()
self.session.close_all()
if self.create_tables:
self.Base.metadata.drop_all(self.connection)
remove_composite_listeners()
self.connection.close()
self.engine.dispose()
def create_models(self):
class User(self.Base):
__tablename__ = 'user'
id = sa.Column(sa.Integer, autoincrement=True, primary_key=True)
name = sa.Column(sa.Unicode(255))
class Category(self.Base):
__tablename__ = 'category'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
@hybrid_property
def articles_count(self):
return len(self.articles)
@articles_count.expression
def articles_count(cls):
return (
sa.select([sa.func.count(self.Article.id)])
.where(self.Article.category_id == self.Category.id)
.correlate(self.Article.__table__)
.label('article_count')
)
@property
def name_alias(self):
return self.name
@synonym_for('name')
@property
def name_synonym(self):
return self.name
class Article(self.Base):
__tablename__ = 'article'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255), index=True)
category_id = sa.Column(sa.Integer, sa.ForeignKey(Category.id))
category = sa.orm.relationship(
Category,
primaryjoin=category_id == Category.id,
backref=sa.orm.backref(
'articles',
collection_class=InstrumentedList
)
)
self.User = User
self.Category = Category
self.Article = Article
def assert_contains(clause, query):
# Test that query executes
query.all()
assert clause in str(query)
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