code: def find_by_project(self, project, params={}, **options): 
          
          path = "/projects/%s/project_memberships" % (project)
          return self.client.get_collection(path, params, **options)
docs: Returns the compact project membership records for the project.
  
          Parameters
          ----------
          project : {Id} The project for which to fetch memberships.
          [params] : {Object} Parameters for the request
            - [user] : {String} If present, the user to filter the memberships to.