def _update(self, obj):
"""
Update the list of items. Returns a unioncache instance.
"""
u = self.filter(obj)
if self.upper == 1:
assert len(u) <= 1, (
"Derived union %s of item %s should have length 1 %s" %
(self.name, obj.id, tuple(u)))
uc = unioncache(u[0] if u else None, self.version)
else:
uc = unioncache(collectionlist(u), self.version)
setattr(obj, self._name, uc)
return uc
def _union(self, obj, exclude=None):
"""Returns a union of all values as a set."""
u: Set[T] = set()
for s in self.subsets:
if s is exclude or not object_has_property(obj, s):
continue
tmp = s.__get__(obj)
if tmp:
try:
u.update(tmp)
except TypeError:
# [0..1] property
u.add(tmp)
return collectionlist(u)
def _update(self, obj):
"""Update the list of items.
Returns a unioncache instance.
"""
u = self.filter(obj)
if self.upper == 1:
assert (
len(u) <= 1
), f"Derived union {self.name} of item {obj.id} should have length 1 {tuple(u)}"
uc = unioncache(self, u[0] if u else None, self.version)
else:
uc = unioncache(self, collectionlist(u), self.version)
setattr(obj, self._name, uc)
return uc
def test_listing():
c: collectionlist[str] = collectionlist()
c.append("a")
c.append("b")
c.append("c")
assert str(c) == "['a', 'b', 'c']"