Unable to specify custom serializer context for GraphQL calls

[bwegrzyn]

The context for GraphQL calls is hard coded instead of using a ContextBuilder service and is impossible to override.

It would be nice to be able to override it so we could set things such as default_constructor_arguments introduced in symfony/symfony#25493.

Currently, for REST calls we can decorate the api_platform.serializer.context_builder service to add custom context properties, but this is not possible for GraphQL calls.

[Simperfit]

Do you want to work on this ? I think we can introduce a contextbuilder service.

[bwegrzyn]

@Simperfit I don't have time to work on it at the moment, but I might be able to put something together in a week or two.

[alanpoulain]

Done in master: https://api-platform.com/docs/master/core/graphql/#changing-the-serialization-context-dynamically