Graphene-django: Auto schema generation

Created on 11 Nov 2016 · 5Comments · Source: graphql-python/graphene-django

So I started playing around with graphene-django last night. We have a complex data model so I don't want to write a shadow graphql schema for our models. We have a similar approach for generating DRF serializers using metaprogramming so I decided to try something with and currently have a query that generates a schema from our app:

from django.apps import apps
from graphene import relay, ObjectType, AbstractType, Schema, Node
from graphene_django import DjangoObjectType
from graphene_django.filter import DjangoFilterConnectionField


def build_query_objs():
    queries = {}
    models = apps.get_app_config('our_app_name').get_models()
    for model in models:
        model_name = model.__name__
        node = type('{model_name}Node'.format(model_name=model_name),
                    (DjangoObjectType,),
                    dict(
                        Meta=type('Meta',
                                  (object,),
                                  dict(model=model,
                                       interfaces=(relay.Node,))
                                  )
                    )
                    )
        queries.update({model_name: relay.Node.Field(node)})
        queries.update({'all_{model_name}'.format(model_name=model_name): DjangoFilterConnectionField(node)})
    return queries

Query = type('Query', (ObjectType,), build_query_objs())

schema = Schema(query=Query)

This worked well but noticed that I couldn't filter on any fields so I have more code (on dev machine atm) that generates filter_fields, and order_filter_field arguments for the generated Meta classes. With a single pass I can filter on 1 thing. I'd like to be able to filter on any nested filters eg customer__order__note_contains or something. Is there a good to get all these query-filter strings for each model?

It would be awesome if you left the filter_fields blank that all possible filters would be generated for the node Meta class.

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