Graphene mutation with list as input

user_628375 0
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I have a graphene mutation like this:


class User(ObjectType):
    username = String()

class ImportUsers(Mutation):
    class Arguments:
        users = List(User)
    Output = List(User)

    @staticmethod
    def mutation(root, info, users):
        ...

But graphene gives me the following error: AssertionError: Mutations.importUsers(users:) argument type must be Input Type but got: [User].

How can I have a mutation in graphene which accepts a list of objects?

graphene-python graphql
2 Answers

I was trying roughly the same thing as you did.

Figured out that custom input types should inherit from graphene.InputObjectType instead of graphene.ObjectType.

class User(graphene.InputObjectType):  # <-- Changed to InputObjectType
    username = graphene.String()

So, having your User like this should solve the case.

user_115724380

Yeah so, basically, you need to have this:

class User(graphene.ObjectType):
    username = graphene.String()

class ImportUsers(Mutation):
    class Arguments:
        users = graphene.List(User)

    Output = graphene.List(User)

    @staticmethod
    def mutation(root, info, users):
        ...

Graphene has a List type. Also, I don't know if it's just me or not, but I think you need to have graphene.(type), not just the type. I am working on something very similar right now to this, so hopefully you find or found your solution, and if you do, let me know how it went! Hopefully I helped xD. I am kinda new to all of this so ye

user_119334250
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