AttributeError: 'str' object has no attribute 'keys'
  File "django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
  File "rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
  File "django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "django/views/decorators/vary.py", line 20, in inner_func
    response = func(*args, **kwargs)
  File "api/report/view.py", line 67, in get
    params = QueryParameters(request=request, caller=self, **kwargs)
  File "api/query_params.py", line 128, in __init__
    self._validate(query_params)  # sets self.parameters
  File "api/query_params.py", line 490, in _validate
    if not qps.is_valid():
  File "rest_framework/serializers.py", line 227, in is_valid
    self._validated_data = self.run_validation(self.initial_data)
  File "rest_framework/serializers.py", line 426, in run_validation
    value = self.to_internal_value(data)
  File "api/report/ocp/serializers.py", line 141, in to_internal_value
    return super().to_internal_value(data)
  File "rest_framework/serializers.py", line 483, in to_internal_value
    validated_value = field.run_validation(primitive_value)
  File "rest_framework/serializers.py", line 426, in run_validation
    value = self.to_internal_value(data)
  File "api/report/ocp/serializers.py", line 44, in to_internal_value
    if serializer_key in data.keys():

data = {
end_date: '1970-01-01', 
filter: '', 
group_by: '', 
limit: '100', 
offset: '0', 
order_by: 'zj 4725*4308 zj', 
start_date: '1970-01-01'
}