morpheus-graphql-0.10.0

Breaking Changes

• all constructors of Resolver: QueryResolver,MutResolver,SubResolver are unexposed. use lift , publish or subscribe instead.
  e.g

  -- Query Resolver
  resolveUser :: ResolveQ EVENT IO User
  resolveUser = lift getDBUser
  
  -- Mutation Resolver
  resolveCreateUser :: ResolveM EVENT IO User
  resolveCreateUser = do
    publish [userUpdate] -- publishes event inside mutation
    lift setDBUser
  
  -- Subscription Resolver
  resolveNewUser :: ResolveS EVENT IO User
  resolveNewUser = subscribe [USER] $ do
    pure $ \(Event _ content) -> lift (getDBUserByContent content)

New features

• exposed publish for mutation resolvers, now you can write

  resolveCreateUser :: ResolveM EVENT IO User
  resolveCreateUser = do
      requireAuthorized
      publish [userUpdate]
      liftEither setDBUser

• exposed subscribe for subscription resolvers, now you can write

  resolveNewUser :: ResolveS EVENT IO User
  resolveNewUser = subscribe [USER] $ do
      requireAuthorized
      pure userByEvent
    where userByEvent (Event _ content) = liftEither (getDBUser content)

• type SubField will convert your subscription monad to query monad.
  SubField (Resolver Subscription Event IO) User will generate same as
  Resolver Subscription Event IO (User ((Resolver QUERY Event IO)))

  now if you can define subscription as follows

  data Subscription m = Subscription {
    newUser :: SubField m User
  }

• unsafeInternalContext to get resolver context, use only if it really necessary.
  the code depending on it may break even on minor version changes.

  resolveUser :: ResolveQ EVENT IO User
  resolveUser = do
    Context { currentSelection, schema, operation } <- unsafeInternalContext
    lift (getDBUser currentSelection)

Minor

• MonadIO instance for resolvers. Thanks @dandoh
• Example using STM, authentication, monad transformers. Thanks @dandoh
• added dependency mtl