Check if model field exists in Django

hasattr(cls,field) will not work in all cases, for example where mixins are used. A safe test is:

            try:
                model._meta.get_field(field)
                .. do stuff here
            except FieldDoesNotExist:
                pass

or

            field = None
            try:
                field = model._meta.get_field(field)
            except FieldDoesNotExist:
                pass

            if field:
              .. do stuff here