An attempt at limiting fields in a kinda okay way

gistfile1.py

class MyBaseResource(ModelResource):
# a resource class that dynamically limits fields

    def full_dehydrate(self, bundle):
        # Dehydrate each field.
        for field_name, field_object in self.limit_fields(bundle):
            # ...
        # ...

    def limit_fields(self, bundle):
        return self.fields.items()

class ImplementedResource(MyBaseClassResource):
    post_only = fields.CharField('attr')

    # limits fields according to type of request
    def limit_fields(self, bundle):
        fields = super(QuestionResource, self).limit_fields(bundle)
        exclude = []
        if bundle.request.method.lower() != 'post':
            exclude.append('post_only')
        return [(name, obj) for name, obj in fields if name not in exclude]