About Optimizing Django Querysets for your GraphQL Queries

The core principle of GraphQL is to load only the data you need. However, when using Graphene-Django, by default it retrieves all fields from the requested table, only limiting what is displayed to the user.

To address this, there's an excellent package called Graphene-Django-Optimizer. This package ensures that only the fields specified in the GraphQL query are selected and also automatically applies select_related() and prefetch_related() to optimize querysets.

Setting it up requires minimal effort - you just wrap all your querysets that you return in resolve_* methods with gql_optimizer.query(queryset, info), for example:

import graphene
from graphene_django.types import DjangoObjectType
import graphene_django_optimizer as gql_optimizer
from posts.models import Post

class PostType(DjangoObjectType):
    class Meta:
        model = Post

class Query(graphene.ObjectType):
    all_posts = graphene.List(PostType)

    def resolve_all_posts(root, info):
        return gql_optimizer.query(Post.objects.all(), info)