I'm having the same problem. I tried to use context and context_value and neither of them works.

same

There seem to be changes in graphql-server-core and flask-graphql to change unit tests :
"Improved query execution using pluggable backend" in graphql-server-core e.g.:
graphql-python/graphql-server@d60b180

There is an underlying change in graphql-python/graphql-core@f6d79ab
in the commit "Modernize execute function" around graphql-core v2.1.0

This is where "context_value" is deprecated for "context"

graphql-python/graphql-core@f6d79ab

It looks like "context" is now not what is being passed by the user of flask-graphql, but a Request object instead. Maybe there is a name collision in flask-graphql?

It looks like the breaking change was actually a long time ago, but was only put out in a full release recently:

d728f80

I don't know if the behaviour of "context_value" was meant to go away and the documentation was left unchanged?

Edit: This also seems to be referenced in the last comment (made after merge) of #19

Is there a recommended way to do the things that were done by using context in older versions? I have seen the suggestion to restore the old context behaviour by inheritence. But I guess context was removed for a reason (btw what reason?), so there may be a better way?

Cannot speak to why they would have possibly removed it but I can say for now I just am using this to work around.

class MyGraphQLView(GraphQLView):
   def get_context(self):
       context = super().get_context()
       context.session = db.session

       return context

Ah thanks! This was what I meant by "restore the old context behavior by inheritance".

I found a test case of passing context.

I succeeded passing custom context in the following way.

app.add_url_rule(
    '/graphql', view_func=GraphQLView.as_view(
        'graphql', schema=SCHEMA, graphiql=True,
        get_context=lambda: {'session': db_session}))

@cockscomb It works perfectly thanks for sharing this