Help with Mutation

Hello, I am trying to experiment with a simple mutation, here is my schema:

import graphene


class Person(graphene.ObjectType):

    name = graphene.String()
    age = graphene.Float()
    id = graphene.Int()

# Database of Person(s)
p1 = Person()
p2 = Person()

p1.id = 1
p1.age = 34
p1.name = 'Jack'

p2.id = 2
p2.age = 31
p2.name = 'Adam'

persons = [p1, p2]

class Query(graphene.ObjectType):

    # Create a field on which we can query and the attributes
    # we allow to query on
    person = graphene.Field(Person, id=graphene.Int())
    def resolve_person(self, args, info):
        for p in persons:
            if p.id == args.get('id'):
                return p

class UpdatePerson(graphene.Mutation):
    # Result field
    # XXX: This doesn't work
    # person = graphene.Field(Person)

    # This does work
    person = graphene.String()

    # The input fields
    class Input:
        name = graphene.String()
        id = graphene.Int()

    @classmethod
    def mutate(cls, instance, args, info):
        name = args.get('name')
        for p in persons:
            if p.id == args.get('id'):
                p.name = name
                return UpdatePerson(person=p.name)

class UpdatePersonMutation(graphene.ObjectType):
    updatePerson = graphene.Field(UpdatePerson)

schema = graphene.Schema(query=Query, mutation=UpdatePersonMutation)

In UpdatePerson above, when I have the person field as person = graphene.Field(Person), ( and correspondingly return UpdatePerson(person=p)), upon sending a mutation query, I get: [GraphQLError('Field "person" of type "Person" must have a sub selection.',)].

Any suggestions as to what I am doing wrong?

[jhgg]

Hi @amitsaha - you are running into the no scalar leafs validation error.

This means your query is wrong.

[syrusakbary]

@amitsaha You can use #graphql #graphene #python 😃