Django comparing model instances for equality

Question

I understand that, with a singleton situation, you can perform such an operation as:

spam == eggs

and if spam and eggs

Answer 1

You can define the Class' __eq__ method to chage that behaviour:

http://docs.python.org/reference/datamodel.html

Answer 2

from https://djangosnippets.org/snippets/2281/

i changed to compare two instance and return Boolean value

def is_same(self, obj):
    excluded_keys = 'timestamp', 'creator_id' # creater_id is one foreign key ins table
    return _is_same(self, obj, excluded_keys)


def _is_same(obj1, obj2, excluded_keys):
    d1, d2 = obj1.__dict__, obj2.__dict__
    for k, v in d1.items():
         # print('check key: ' + k)
        if k in excluded_keys or k in ['_state', '_django_cleanup_original_cache']: # _state make difference so automatically exclude it
            # print(k + ' is in excluded keys')
            continue

        if v != d2[k]:
            # print('value in not equal in second object')
            return False
        else:
            # print('it is same')
            continue

    # print('all keys checked, so both object is same')
    return True