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|
import sqlalchemy as sa
from pytest import raises
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy_utils import get_class_by_table
class TestGetClassByTableWithJoinedTableInheritance(object):
def setup_method(self, method):
self.Base = declarative_base()
class Entity(self.Base):
__tablename__ = 'entity'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.String)
type = sa.Column(sa.String)
__mapper_args__ = {
'polymorphic_on': type,
'polymorphic_identity': 'entity'
}
class User(Entity):
__tablename__ = 'user'
id = sa.Column(
sa.Integer,
sa.ForeignKey(Entity.id, ondelete='CASCADE'),
primary_key=True
)
__mapper_args__ = {
'polymorphic_identity': 'user'
}
self.Entity = Entity
self.User = User
def test_returns_class(self):
assert get_class_by_table(self.Base, self.User.__table__) == self.User
assert get_class_by_table(
self.Base,
self.Entity.__table__
) == self.Entity
def test_table_with_no_associated_class(self):
table = sa.Table(
'some_table',
self.Base.metadata,
sa.Column('id', sa.Integer)
)
assert get_class_by_table(self.Base, table) is None
class TestGetClassByTableWithSingleTableInheritance(object):
def setup_method(self, method):
self.Base = declarative_base()
class Entity(self.Base):
__tablename__ = 'entity'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.String)
type = sa.Column(sa.String)
__mapper_args__ = {
'polymorphic_on': type,
'polymorphic_identity': 'entity'
}
class User(Entity):
__mapper_args__ = {
'polymorphic_identity': 'user'
}
self.Entity = Entity
self.User = User
def test_multiple_classes_without_data_parameter(self):
with raises(ValueError):
assert get_class_by_table(
self.Base,
self.Entity.__table__
)
def test_multiple_classes_with_data_parameter(self):
assert get_class_by_table(
self.Base,
self.Entity.__table__,
{'type': 'entity'}
) == self.Entity
assert get_class_by_table(
self.Base,
self.Entity.__table__,
{'type': 'user'}
) == self.User
def test_multiple_classes_with_bogus_data(self):
with raises(ValueError):
assert get_class_by_table(
self.Base,
self.Entity.__table__,
{'type': 'unknown'}
)
|
