code: def handle(self, *args, **options):
          
  
          def get_user(username):
              try:
                  return User.objects.get(username=username)
              except ObjectDoesNotExist as e:
                  raise CommandError("This user doesn't exist in the database")
  
          def get_fields_permissions(user):
              try:
                  return UserFieldPermissions.objects.get(user=user)
              except ObjectDoesNotExist as e:
                  raise CommandError("This user doesn't have fields permissions")
  
  
  
          if len(args) !=1:
              raise CommandError("Specifies a user")
          else:
              try:
                  self.stdout.ending = None
                  user = get_user(args[0])
                  fields_permissions  = get_fields_permissions(user)
                  permissions = fields_permissions.permissions.all()
  
                  jsoneatthat = {'username': user.username, 
                      'fields_permissions' : [ {'app_label': permission.content_type.app_label, 'model' : permission.content_type.model, 'name': permission.name } for permission in permissions]}
  
                  self.stdout.write(json.dumps(jsoneatthat))
  
              except:
                  raise
docs: dump fields permissions for a user