Modify the context in Ariadne before the resolvers

Question

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

Answer 1

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'}