title: how to decouple graphql/graphene mutations
body: <pre><code>class SaveData(graphene.Mutation):
      class Argument:
          some args - 
      
      def mutate(self, info, **kwargs):
              some acl function to check access(
              param1
              param2
              param3
              )
              save data()
  </code></pre>
  <p>I've couple of mutations which I want to write in separate files, and also each mutated method has a common method to check access. Is there a way to move this common method to a base class from which I can inherit child classes, and have the access check method in base class itself ?</p>
  <p>Things that I've tried :
  I tried to have the common access check method as classmethod and to call it from child class's mutate, but i am not able to call super's classmethod, any workarounds on this ?</p>