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- """Utilities for defining models
- """
- # The following comment should be removed at some point in the future.
- # mypy: disallow-untyped-defs=False
- import operator
- class KeyBasedCompareMixin(object):
- """Provides comparison capabilities that is based on a key
- """
- __slots__ = ['_compare_key', '_defining_class']
- def __init__(self, key, defining_class):
- self._compare_key = key
- self._defining_class = defining_class
- def __hash__(self):
- return hash(self._compare_key)
- def __lt__(self, other):
- return self._compare(other, operator.__lt__)
- def __le__(self, other):
- return self._compare(other, operator.__le__)
- def __gt__(self, other):
- return self._compare(other, operator.__gt__)
- def __ge__(self, other):
- return self._compare(other, operator.__ge__)
- def __eq__(self, other):
- return self._compare(other, operator.__eq__)
- def __ne__(self, other):
- return self._compare(other, operator.__ne__)
- def _compare(self, other, method):
- if not isinstance(other, self._defining_class):
- return NotImplemented
- return method(self._compare_key, other._compare_key)
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