code: def save(self, *args, **kwargs):
      if self.key is None:
          self.key = uuid4()
  
      return super(Membership, self).save(*args, **kwargs)
  
imports: from uuid import uuid4
  from django.db import models
  from modelchimp.models.user import User
  from modelchimp.models.project import Project
label_desc: Use image node_id 2 for calling the Membership obj's underlying member method code with example usage: obj.save() and returns: super