def _create_history(attr, state, current):
original = state.committed_state.get(attr.key, NEVER_SET)
if hasattr(attr, 'get_collection'):
current = attr.get_collection(state, current)
if original is NO_VALUE:
return (list(current), [], [])
elif original is NEVER_SET:
return ([], list(current), [])
else:
collection = util.OrderedIdentitySet(current)
s = util.OrderedIdentitySet(original)
return (list(collection.difference(s)),
list(collection.intersection(s)),
list(s.difference(collection)))
else:
if current is NO_VALUE:
if original not in [None, NEVER_SET, NO_VALUE]:
deleted = [original]
else:
deleted = []
return ([], [], deleted)
elif original is NO_VALUE:
return ([current], [], [])
elif original is NEVER_SET or attr.is_equal(
current, original
) is True: # dont let ClauseElement expressions here trip things up
return ([], [current], [])
else:
if original is not None:
deleted = [original]
else:
deleted = []
return ([current], [], deleted)
def test_intersection(self):
elem = object
eq_ = self.assert_eq
a, b, c, d, e, f, g = elem(), elem(), elem(), elem(), elem(), elem(), elem()
s1 = util.OrderedIdentitySet([a, b, c])
s2 = util.OrderedIdentitySet([d, e, f])
s3 = util.OrderedIdentitySet([a, d, f, g])
eq_(s1.intersection(s2), [])
eq_(s1.intersection(s3), [a])
eq_(s1.union(s2).intersection(s3), [a, d, f])
def test_add(self):
elem = object
s = util.OrderedIdentitySet()
s.add(elem())
s.add(elem())
def __init__(self):
self.deleted_items = util.IdentitySet()
self.added_items = util.OrderedIdentitySet()
