An example GraphQL schema using Graphene for Django.

schema.py

import graphene
from graphene_django.types import DjangoObjectType
from graphene_django.filter import DjangoFilterConnectionField

from our_app import models

class OrderNode(DjangoObjectType):
    class Meta:
        model = models.Order
        interfaces = [graphene.relay.Node]
        
class LineItemNode(DjangoObjectType):
    class Meta:
        model = models.LineItem
        interfaces = [graphene.relay.Node]
        
class PartNode(DjangoObjectType):
    class Meta:
        model = models.Part
        interfaces = [graphene.relay.Node]
        
class Query(graphene.ObjectType):
    order = graphene.relay.Node.Field(OrderNode)
    orders = DjangoFilterConnectionField(OrderNode)
    line_item = graphene.relay.Node.Field(LineItemNode)
    line_items = DjangoFilterConnectionField(LineItemNode)
    part = graphene.relay.Node.Field(PartNode)
    parts = DjangoFilterConnectionField(PartNode)
    
def resolve_orders(self, args, context, info):
        return models.Order.objects.prefetch_related('line_items').all()
  
def resolve_line_items(self, args, context, info):
        return models.LineItem.objects.all()
  
def resolve_parts(self, args, context, info):
        return models.Part.objects.all()
  
schema = graphene.Schema(query=Query)