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"""
test many to many relationships
"""
from elixir import *
#-----------
class TestManyToMany(object):
def setup(self):
metadata.bind = 'sqlite:///'
def teardown(self):
cleanup_all(True)
def test_simple(self):
class A(Entity):
name = Field(String(60))
bs_ = ManyToMany('B')
class B(Entity):
name = Field(String(60))
as_ = ManyToMany('A')
setup_all(True)
b1 = B(name='b1', as_=[A(name='a1')])
session.commit()
session.clear()
a = A.query.one()
b = B.query.one()
assert a in b.as_
assert b in a.bs_
def test_column_format(self):
class A(Entity):
using_options(tablename='aye')
name = Field(String(60))
bs_ = ManyToMany('B', column_format='%(entity)s_%(key)s')
class B(Entity):
using_options(tablename='bee')
name = Field(String(60))
as_ = ManyToMany('A', column_format='%(entity)s_%(key)s')
setup_all(True)
b1 = B(name='b1', as_=[A(name='a1')])
session.commit()
session.clear()
a = A.query.one()
b = B.query.one()
assert a in b.as_
assert b in a.bs_
found_a = False
found_b = False
for column in A.mapper.get_property('bs_').secondary.columns:
if column.name == 'a_id': found_a = True
elif column.name == 'b_id': found_b = True
assert found_a
assert found_b
def test_multi_pk_in_target(self):
class A(Entity):
key1 = Field(Integer, primary_key=True, autoincrement=False)
key2 = Field(String(40), primary_key=True)
bs_ = ManyToMany('B')
class B(Entity):
name = Field(String(60))
as_ = ManyToMany('A')
setup_all(True)
b1 = B(name='b1', as_=[A(key1=10, key2='a1')])
session.commit()
session.clear()
a = A.query.one()
b = B.query.one()
assert a in b.as_
assert b in a.bs_
def test_multi(self):
class A(Entity):
name = Field(String(100))
rel1 = ManyToMany('B')
rel2 = ManyToMany('B')
class B(Entity):
name = Field(String(20), primary_key=True)
setup_all(True)
b1 = B(name='b1')
a1 = A(name='a1', rel1=[B(name='b2'), b1],
rel2=[B(name='b3'), B(name='b4'), b1])
session.commit()
session.clear()
a1 = A.query.one()
b1 = B.get_by(name='b1')
b2 = B.get_by(name='b2')
assert b1 in a1.rel1
assert b1 in a1.rel2
assert b2 in a1.rel1
def test_selfref(self):
class Person(Entity):
name = Field(String(30))
friends = ManyToMany('Person')
setup_all(True)
barney = Person(name="Barney")
homer = Person(name="Homer", friends=[barney])
barney.friends.append(homer)
session.commit()
session.clear()
homer = Person.get_by(name="Homer")
barney = Person.get_by(name="Barney")
assert homer in barney.friends
assert barney in homer.friends
def test_has_and_belongs_to_many(self):
class A(Entity):
has_field('name', String(100))
has_and_belongs_to_many('bs', of_kind='B')
class B(Entity):
has_field('name', String(100), primary_key=True)
setup_all(True)
b1 = B(name='b1')
a1 = A(name='a1', bs=[B(name='b2'), b1])
a2 = A(name='a2', bs=[B(name='b3'), b1])
a3 = A(name='a3')
session.commit()
session.clear()
a1 = A.get_by(name='a1')
a2 = A.get_by(name='a2')
a3 = A.get_by(name='a3')
b1 = B.get_by(name='b1')
b2 = B.get_by(name='b2')
assert b1 in a1.bs
assert b2 in a1.bs
assert b1 in a2.bs
assert not a3.bs
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