def __isub__(self, other):
try:
self._query.update['$inc'][str(self)] -= other
except KeyError:
self._query and dict_update(self._query.update, {'$inc': {str(self): -other}})
#prevent for setting a value
return IgnoreValue
def __setattr__(self, key, value):
if key[0] == '_':
object.__setattr__(self, key, value)
elif value is not IgnoreValue:
parent_key = str(self)
if parent_key:
key = parent_key + '.' + key
self._query and dict_update(self._query.update, {'$set': {key: value}})
def __delattr__(self, item):
parent_key = str(self)
if parent_key:
item = parent_key + '.' + item
self._query and dict_update(self._query.update, {'$unset': {item: ''}})
