Как сделать мутационный запрос в GraphQL в Django?

# Model
class Customer(models.Model):
    name = models.CharField(max_length=150)
    address = models.CharField(max_length=150)

# Node
class CustomerNode(DjangoObjectType):
    class Meta:
        model = Customer
        interfaces = (relay.Node,)


# Mutations
class CreateCustomerMutation(relay.ClientIDMutation):
    class Input:
        name = graphene.String(required=True)
        address = graphene.String()

    customer = graphene.Field(CustomerNode)

    @classmethod
    def mutate_and_get_payload(cls, root, info, **input):
        customer_instance = Customer(
            name=input.name,
            address=input.address,
        )
        customer_instance.save()
        return CreateCustomerMutation(customer=customer_instance)

class Mutation(ObjectType):
    create_customer = graphene.Field(CreateCustomerMutation)

# Schema
schema = graphene.Schema(query=Query, mutation=Mutation)

Я просмотрел документацию и другие руководства, но не могу понять, как выполнить мутационный запрос. Я пробовал

# Query 1
mutation {
   createCustomer(name: "John", address: "Some address") {
     id, name
   }
}
# Query 2
mutation {
   createCustomer(input: {name: "John", address: "Some address"}) {
     id, name
   }
}

но он не работает и показывает ошибку -

# Query 1
"Unknown argument 'name' on field 'Mutation.createCustomer'."
"Unknown argument 'address' on field 'Mutation.createCustomer'."

# Query 2
"Unknown argument 'input' on field 'Mutation.createCustomer'."

Что я упускаю? Каков правильный синтаксис/выражение для этого?

class Mutation(ObjectType):
    create_customer = graphene.Field(CreateCustomerMutation)

create_customer = graphene.Field(CreateCustomerMutation)

create_customer = CreateCustomerMutation.Field()