Performance Tips¶

Database Optimization¶

Efficient Queries with select_relatedCustom Resolver Optimization

The hook goes on the node type, not on the list container. A DjangoListObjectField resolves rows through the DjangoObjectType the container wraps, and that is the class whose get_queryset runs — see Fields → Performance Optimization.

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

    @classmethod
    def get_queryset(cls, queryset, info):
        return queryset.select_related(
            'author', 'author__profile', 'category'
        ).prefetch_related(
            'tags', 'comments__author'
        )

class PostListType(DjangoListObjectType):
    class Meta:
        model = Post
        pagination = LimitOffsetGraphqlPagination(default_limit=10)

from django_graphex.core import ObjectType

class Query(ObjectType):
    popular_posts = DjangoFilterListField(PostType)

    def resolve_popular_posts(self, info, **kwargs):
        return Post.objects.filter(
            status='published',
            view_count__gte=100
        ).select_related(
            'author', 'category'
        ).prefetch_related(
            'tags'
        ).order_by('-view_count')

These comprehensive examples demonstrate the full power of django-graphex in building feature-rich GraphQL APIs with Django. The combination of filtering, pagination, mutations, and directives provides a robust foundation for modern web applications.