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from sqlalchemy import *
from sqlalchemy import exc as sa_exc
from sqlalchemy.orm import *
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import fixtures
from sqlalchemy import testing
class CompileTest(fixtures.ORMTest):
"""test various mapper compilation scenarios"""
def teardown(self):
clear_mappers()
def test_with_polymorphic(self):
metadata = MetaData(testing.db)
order = Table('orders', metadata,
Column('id', Integer, primary_key=True),
Column('employee_id', Integer, ForeignKey('employees.id'), nullable=False),
Column('type', Unicode(16)))
employee = Table('employees', metadata,
Column('id', Integer, primary_key=True),
Column('name', Unicode(16), unique=True, nullable=False))
product = Table('products', metadata,
Column('id', Integer, primary_key=True),
)
orderproduct = Table('orderproducts', metadata,
Column('id', Integer, primary_key=True),
Column('order_id', Integer, ForeignKey("orders.id"), nullable=False),
Column('product_id', Integer, ForeignKey("products.id"), nullable=False),
)
class Order(object):
pass
class Employee(object):
pass
class Product(object):
pass
class OrderProduct(object):
pass
order_join = order.select().alias('pjoin')
order_mapper = mapper(Order, order,
with_polymorphic=('*', order_join),
polymorphic_on=order_join.c.type,
polymorphic_identity='order',
properties={
'orderproducts': relationship(OrderProduct, lazy='select', backref='order')}
)
mapper(Product, product,
properties={
'orderproducts': relationship(OrderProduct, lazy='select', backref='product')}
)
mapper(Employee, employee,
properties={
'orders': relationship(Order, lazy='select', backref='employee')})
mapper(OrderProduct, orderproduct)
# this requires that the compilation of order_mapper's "surrogate
# mapper" occur after the initial setup of MapperProperty objects on
# the mapper.
configure_mappers()
def test_conflicting_backref_one(self):
"""test that conflicting backrefs raises an exception"""
metadata = MetaData(testing.db)
order = Table('orders', metadata,
Column('id', Integer, primary_key=True),
Column('type', Unicode(16)))
product = Table('products', metadata,
Column('id', Integer, primary_key=True),
)
orderproduct = Table('orderproducts', metadata,
Column('id', Integer, primary_key=True),
Column('order_id', Integer, ForeignKey("orders.id"), nullable=False),
Column('product_id', Integer, ForeignKey("products.id"), nullable=False),
)
class Order(object):
pass
class Product(object):
pass
class OrderProduct(object):
pass
order_join = order.select().alias('pjoin')
order_mapper = mapper(Order, order,
with_polymorphic=('*', order_join),
polymorphic_on=order_join.c.type,
polymorphic_identity='order',
properties={
'orderproducts': relationship(OrderProduct, lazy='select', backref='product')}
)
mapper(Product, product,
properties={
'orderproducts': relationship(OrderProduct, lazy='select', backref='product')}
)
mapper(OrderProduct, orderproduct)
assert_raises_message(
sa_exc.ArgumentError,
"Error creating backref",
configure_mappers
)
def test_misc_one(self):
metadata = MetaData(testing.db)
node_table = Table("node", metadata,
Column('node_id', Integer, primary_key=True),
Column('name_index', Integer, nullable=True),
)
node_name_table = Table("node_name", metadata,
Column('node_name_id', Integer, primary_key=True),
Column('node_id', Integer, ForeignKey('node.node_id')),
Column('host_id', Integer, ForeignKey('host.host_id')),
Column('name', String(64), nullable=False),
)
host_table = Table("host", metadata,
Column('host_id', Integer, primary_key=True),
Column('hostname', String(64), nullable=False,
unique=True),
)
metadata.create_all()
try:
node_table.insert().execute(node_id=1, node_index=5)
class Node(object):pass
class NodeName(object):pass
class Host(object):pass
node_mapper = mapper(Node, node_table)
host_mapper = mapper(Host, host_table)
node_name_mapper = mapper(NodeName, node_name_table,
properties = {
'node' : relationship(Node, backref=backref('names')),
'host' : relationship(Host),
}
)
sess = create_session()
assert sess.query(Node).get(1).names == []
finally:
metadata.drop_all()
def test_conflicting_backref_two(self):
meta = MetaData()
a = Table('a', meta, Column('id', Integer, primary_key=True))
b = Table('b', meta, Column('id', Integer, primary_key=True),
Column('a_id', Integer, ForeignKey('a.id')))
class A(object):
pass
class B(object):
pass
mapper(A, a, properties={
'b':relationship(B, backref='a')
})
mapper(B, b, properties={
'a':relationship(A, backref='b')
})
assert_raises_message(
sa_exc.ArgumentError,
"Error creating backref",
configure_mappers
)
def test_conflicting_backref_subclass(self):
meta = MetaData()
a = Table('a', meta, Column('id', Integer, primary_key=True))
b = Table('b', meta, Column('id', Integer, primary_key=True),
Column('a_id', Integer, ForeignKey('a.id')))
class A(object):
pass
class B(object):
pass
class C(B):
pass
mapper(A, a, properties={
'b': relationship(B, backref='a'),
'c': relationship(C, backref='a')
})
mapper(B, b)
mapper(C, None, inherits=B)
assert_raises_message(
sa_exc.ArgumentError,
"Error creating backref",
configure_mappers
)
|
