Modify the context in Ariadne before the resolvers

How to modify the content of the context before it is passed to the resolver functions?

Checkout the documentation for the special Ariadne type ContextValue.

The GraphQL class accepts a keyword argument context_value. It can be of any type and will be set as context.

If a callable is passed, then it will be called with the request as an argument.

So:

1. Create a function to build the desired context

   def get_context_value(request):
       return {'request': request, 'test': "TEST"}
   

2. Pass the function at GraphQL initialization:

   app = GraphQL(
       schema,
       context_value=get_context_value,
       debug=True,
   )
   

Context value inside resolvers:

{'request': <starlette.requests.Request object at 0x7fc363dbf370>, 'test': 'TEST'}