graphene-mongo not compatible with graphql-server due to GraphQLResolveInfo.context handling

[leonardwellthy]

Error description

Running the tutorial application at https://graphene-mongo.readthedocs.io/en/latest/tutorial.html with graphql-server[flask] instead of Flask-GraphQL installed results in the following error being returned

{
  "errors": [
    {
      "message": "'dict' object has no attribute 'queryset'",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "allEmployees"
      ]
    }
  ],
  "data": {
    "allEmployees": null
  }
}

Underlying Cause

graphql-server passes its GraphQLResolveInfo.context as a dict rather than an object with attribute getters and setters, which leads to an Exception whenever graphene-mongo attempts to set a queryset attribute on it

graphene-django and the old Flask-GraphQL pass a Request object as the GraphQLResolveInfo.context and graphene-mongo defaults the context to a graphene Context object if no context is specified

Workaround

Subclass graphql-server's GraphQLView to create a context that allows a queryset attribute to be set

class DictWithQuerySet(dict):
    def __init__(self, *args, **kwargs):
        super(DictWithQuerySet, self).__init__(*args, **kwargs)
        self.queryset = None


class MyGraphQLView(GraphQLView):
    def get_context(self):
        context = super().get_context()
        return DictWithQuerySet(context)