graphene-django/docs/debug.rst

Django Debug Middleware
=======================

You can debug your GraphQL queries in a similar way to
`django-debug-toolbar <https://django-debug-toolbar.readthedocs.org/>`__,
but outputing in the results in GraphQL response as fields, instead of
the graphical HTML interface.

For that, you will need to add the plugin in your graphene schema.

Installation
------------

For use the Django Debug plugin in Graphene:

* Add ``graphene_django.debug.DjangoDebugMiddleware`` into ``MIDDLEWARE`` in the ``GRAPHENE`` settings.

* Add the ``debug`` field into the schema root ``Query`` with the value ``graphene.Field(DjangoDebug, name='_debug')``.


.. code:: python

    from graphene_django.debug import DjangoDebug

    class Query(graphene.ObjectType):
        # ...
        debug = graphene.Field(DjangoDebug, name='_debug')

    schema = graphene.Schema(query=Query)


And in your ``settings.py``:

.. code:: python

    GRAPHENE = {
        ...
        'MIDDLEWARE': [
            'graphene_django.debug.DjangoDebugMiddleware',
        ]
    }

Querying
--------

You can query it for outputing all the sql transactions that happened in
the GraphQL request, like:

.. code::

    {
      # A example that will use the ORM for interact with the DB
      allIngredients {
        edges {
          node {
            id,
            name
          }
        }
      }
      # Here is the debug field that will output the SQL queries
      _debug {
        sql {
          rawSql
        }
      }
    }

Note that the ``_debug`` field must be the last field in your query.