Add Documentation for Relay Edge implementation

In the Relay mutation docs, performing RANGE_ADD requires that the new edge created by the mutation is provided in the payload.

I do not know how to provide the correct cursor/Edge construction within the relay.ClientIDMutation subclass.

The following code I wrote:

new_object_edge = graphene.Field('ObjectEdge')

I believed would solve my issue, with a proper resolve_new_object_edge(...) resolver.

However, my resolver cannot reference the relay.ConnectionField that is specified on one of the other object types in my mutation, since it only has the context of my (in this case, Django) objects.

I experimented with relay.Edge.for_node(SomeObjectType) as well but all of the solutions I have tried so far modify the schema correctly but cannot return the appropriate Edge.

The implementation of this scenario in javascript can be found here in the Relay examples directory.

Any idea of a best approach? I can take this question to stack overflow, but felt that people using Relay & Graphene would enjoy seeing an example solution in the docs.

[rangermeier]

Since I struggled a lot to expose a newly created item as edge, here is a complete example using Graphene 2.0, building on the suggestions from @mickeyinfoshan and @varuna82. Hope this is of some help:

import graphene
from graphene import relay
from graphene_django import DjangoObjectType
from graphql_relay.connection.arrayconnection import offset_to_cursor
from myapp import models

class Topic(DjangoObjectType):
    class Meta:
        model = models.Topic
        interfaces = (relay.Node, )

TopicEdge = Topic._meta.connection.Edge

class CreateTopic(relay.ClientIDMutation):
    class Input:
        title = graphene.String(required=True)

    topic = graphene.Field(Topic)
    topic_edge = graphene.Field(TopicEdge)

    @classmethod
    def mutate_and_get_payload(cls, root, info, **input):
        topic = models.Topic.objects.create(title=input['title'], created_by=user)
        edge = TopicEdge(cursor=offset_to_cursor(0), node=topic)
        return CreateTopic(topic=topic, topic_edge=edge)

[reinierpd]

I’m using graphene-django 1.3 and neither relay.types.Edge or relay.Edge exist. Any idea from where can i import Edge ?? @mickeyinfoshan