def __init__(self, **kwargs):
'''
Construct new Item with
attributes kwargs.
Raise ItemAttributeError if
a required attribute is not found.
'''
with_table(self.__class__)
self._created = False
self._data = {}
self._modified = {}
self._digest(kwargs)
def resolve(self, index):
''' (Query, int) -> Item
Return Item at index based on scope
of this Query.
'''
# not a hack I promise
# makes sure table is created
# before querying items
with_table(self._table)
if self._hash_key:
if index != 0:
# after setting scope
# keys, cannot use index
# i.e, this should fail
# query.filter(id=_)[1]
raise InvalidQueryError((
"Cannot use index "
"after having set "
"a filtering key."
))
return read_item(self)
