Subscriptions throw an exception on the server

[nareshbhatia]

Book creation results in an exception on the server:

Cannot read property 'bookService' of undefined

The underlying reason is that dataSources are not passed to resolvers during pubsub.publish()

Related issues:

1. Datasources missing in the context when using subscriptions apollographql/apollo-server#1526
2. Unable to get context for subscriptions apollographql/apollo-server#1553

For now, I have worked around this issue by creating a global instance of dataSources instead of passing it via context.

[robross0606]

When was the last time you checked if this was still an issue?

[snwfdhmp]

@nareshbhatia up

[nareshbhatia]

Don't think there is an update from Apollo on this issue. See the comments on their roadmap, e.g. apollographql/apollo-server#2360 (comment)