AttributeError on Graphqlview

[vallode]

Cannot find much information about this and struggling to debug myself:

AttributeError: 'dict' object has no attribute 'decode'

Error appears when accessing the graphql IDE with a minimal setup:

class Query(graphene.ObjectType):
    node = relay.Node.Field()

schema = graphene.Schema(query=Query)

app.add_url_rule(
    "/graphql",
    view_func=GraphQLView.as_view("graphql", schema=schema, graphiql=True),
)

All queries are faced with this error, without the graphql IDE the endpoint is fine.

[vallode]

Jumped to conclusions, we were using FlaskAPI which was hijacking the parsing of data sent back to the graphql interface. If anyone stumbles on this issue you have to create a custom parser like so:

class GraphQLParser(BaseParser):
    media_type = "application/json"

    def parse(self, stream, media_type, **options):
        return stream.read()

And use it in your view func definition like so:

app.add_url_rule(
    "/graphql",
    view_func=set_parsers(GraphQLParser)(
        GraphQLView.as_view("graphql", schema=schema, graphiql=True)
    ),
)