Documentation for Custom grouping logic has incorrect definition of the callback parameter #96
Description
The documentation for Custom grouping logic states that:
The callback's one parameter is an instance of RaygunMessage (python[2/3]/raygunmsgs.py), and the callback should return a string.
But it appears that this is not the case. Instead it appears to be a dict object which is returned from RaygunSender._transform_message as a result of calling utilities.filter_keys.
The code at utilities.py Line 16 has this:
if isinstance(object, raygunmsgs.RaygunMessage):
iteration_target = object.__dict__
which is the point where the RaygunMessage is converted to a dict.
The sample code return raygun_message.get_error().message[:100] therefore crashes with an AttributeError:
AttributeError: 'dict' object has no attribute 'get_error'
This however will work:
return raygun_message['details']['error'].message[:100]
The raygun_message['details']['error'] accesses the instance of RaygunErrorMessage