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from sqlalchemy import *
from sqlalchemy.orm.sync import ONETOMANY, MANYTOONE
import testbase
def produce_test(parent, child, direction):
"""produce a testcase for A->B->C inheritance with a self-referential
relationship between two of the classes, using either one-to-many or
many-to-one."""
class ABCTest(testbase.ORMTest):
def define_tables(self, meta):
global ta, tb, tc
ta = ["a", meta]
ta.append(Column('id', Integer, primary_key=True)),
ta.append(Column('a_data', String(30)))
if "a"== parent and direction == MANYTOONE:
ta.append(Column('child_id', Integer, ForeignKey("%s.id" % child, use_alter=True, name="foo")))
elif "a" == child and direction == ONETOMANY:
ta.append(Column('parent_id', Integer, ForeignKey("%s.id" % parent, use_alter=True, name="foo")))
ta = Table(*ta)
tb = ["b", meta]
tb.append(Column('id', Integer, ForeignKey("a.id"), primary_key=True, ))
tb.append(Column('b_data', String(30)))
if "b"== parent and direction == MANYTOONE:
tb.append(Column('child_id', Integer, ForeignKey("%s.id" % child, use_alter=True, name="foo")))
elif "b" == child and direction == ONETOMANY:
tb.append(Column('parent_id', Integer, ForeignKey("%s.id" % parent, use_alter=True, name="foo")))
tb = Table(*tb)
tc = ["c", meta]
tc.append(Column('id', Integer, ForeignKey("b.id"), primary_key=True, ))
tc.append(Column('c_data', String(30)))
if "c"== parent and direction == MANYTOONE:
tc.append(Column('child_id', Integer, ForeignKey("%s.id" % child, use_alter=True, name="foo")))
elif "c" == child and direction == ONETOMANY:
tc.append(Column('parent_id', Integer, ForeignKey("%s.id" % parent, use_alter=True, name="foo")))
tc = Table(*tc)
def tearDown(self):
if direction == MANYTOONE:
parent_table = {"a":ta, "b":tb, "c": tc}[parent]
parent_table.update(values={parent_table.c.child_id:None}).execute()
elif direction == ONETOMANY:
child_table = {"a":ta, "b":tb, "c": tc}[child]
child_table.update(values={child_table.c.parent_id:None}).execute()
super(ABCTest, self).tearDown()
def test_roundtrip(self):
parent_table = {"a":ta, "b":tb, "c": tc}[parent]
child_table = {"a":ta, "b":tb, "c": tc}[child]
if direction == MANYTOONE:
foreign_keys = [parent_table.c.child_id]
elif direction == ONETOMANY:
foreign_keys = [child_table.c.parent_id]
atob = ta.c.id==tb.c.id
btoc = tc.c.id==tb.c.id
if direction == ONETOMANY:
relationjoin = parent_table.c.id==child_table.c.parent_id
elif direction == MANYTOONE:
relationjoin = parent_table.c.child_id==child_table.c.id
abcjoin = polymorphic_union(
{"a":ta.select(tb.c.id==None, from_obj=[ta.outerjoin(tb, onclause=atob)]),
"b":ta.join(tb, onclause=atob).outerjoin(tc, onclause=btoc).select(tc.c.id==None, fold_equivalents=True),
"c":tc.join(tb, onclause=btoc).join(ta, onclause=atob)
},"type", "abcjoin"
)
bcjoin = polymorphic_union(
{
"b":ta.join(tb, onclause=atob).outerjoin(tc, onclause=btoc).select(tc.c.id==None, fold_equivalents=True),
"c":tc.join(tb, onclause=btoc).join(ta, onclause=atob)
},"type", "bcjoin"
)
class A(object):pass
class B(A):pass
class C(B):pass
mapper(A, ta, polymorphic_on=abcjoin.c.type, select_table=abcjoin, polymorphic_identity="a")
mapper(B, tb, polymorphic_on=bcjoin.c.type, select_table=bcjoin, polymorphic_identity="b", inherits=A, inherit_condition=atob)
mapper(C, tc, polymorphic_identity="c", inherits=B, inherit_condition=btoc)
parent_mapper = class_mapper({ta:A, tb:B, tc:C}[parent_table])
child_mapper = class_mapper({ta:A, tb:B, tc:C}[child_table])
parent_class = parent_mapper.class_
child_class = child_mapper.class_
parent_mapper.add_property("collection", relation(child_mapper, primaryjoin=relationjoin, foreign_keys=foreign_keys, uselist=True))
sess = create_session()
parent_obj = parent_class()
child_obj = child_class()
somea = A()
someb = B()
somec = C()
print "APPENDING", parent.__class__.__name__ , "TO", child.__class__.__name__
sess.save(parent_obj)
parent_obj.collection.append(child_obj)
if direction == ONETOMANY:
child2 = child_class()
parent_obj.collection.append(child2)
sess.save(child2)
elif direction == MANYTOONE:
parent2 = parent_class()
parent2.collection.append(child_obj)
sess.save(parent2)
sess.save(somea)
sess.save(someb)
sess.save(somec)
sess.flush()
sess.clear()
# assert result via direct get() of parent object
result = sess.query(parent_class).get(parent_obj.id)
assert result.id == parent_obj.id
assert result.collection[0].id == child_obj.id
if direction == ONETOMANY:
assert result.collection[1].id == child2.id
elif direction == MANYTOONE:
result2 = sess.query(parent_class).get(parent2.id)
assert result2.id == parent2.id
assert result2.collection[0].id == child_obj.id
sess.clear()
# assert result via polymorphic load of parent object
result = sess.query(A).get_by(id=parent_obj.id)
assert result.id == parent_obj.id
assert result.collection[0].id == child_obj.id
if direction == ONETOMANY:
assert result.collection[1].id == child2.id
elif direction == MANYTOONE:
result2 = sess.query(A).get_by(id=parent2.id)
assert result2.id == parent2.id
assert result2.collection[0].id == child_obj.id
ABCTest.__name__ = "Test%sTo%s%s" % (parent, child, (direction is ONETOMANY and "O2M" or "M2O"))
return ABCTest
# test all combinations of polymorphic a/b/c related to another of a/b/c
for parent in ["a", "b", "c"]:
for child in ["a", "b", "c"]:
if parent == child:
continue
for direction in [ONETOMANY, MANYTOONE]:
testclass = produce_test(parent, child, direction)
exec("%s = testclass" % testclass.__name__)
if __name__ == "__main__":
testbase.main()
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