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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_source_handler(self, model, source):
 """ Allow the nested Column source to be its own handler. """

        if isinstance(source, Column):
            return source

        # Generate a generic handler for the source
        modelfield = resolve_orm_path(model, source)
        column_class = get_column_for_modelfield(modelfield)
        return column_class()