Safe Haskell	Safe
Language	Haskell2010

Language.GraphQL.Trans

Description

Monad transformer stack used by the GraphQL resolvers.

Synopsis

newtype ActionT m a = ActionT {
- runActionT :: ExceptT Text (ReaderT Context m) a
}
newtype Context = Context {
- arguments :: Arguments
}
argument :: Monad m => Name -> ActionT m Value

Documentation

newtype ActionT m a Source #

Monad transformer stack used by the resolvers to provide error handling and resolution context (resolver arguments).

Constructors

ActionT
Fields runActionT :: ExceptT Text (ReaderT Context m) a

Instances

MonadTrans ActionT Source #
Instance details Defined in Language.GraphQL.Trans Methods lift :: Monad m => m a -> ActionT m a #
Monad m => Monad (ActionT m) Source #
Instance details Defined in Language.GraphQL.Trans Methods (>>=) :: ActionT m a -> (a -> ActionT m b) -> ActionT m b # (>>) :: ActionT m a -> ActionT m b -> ActionT m b # return :: a -> ActionT m a # fail :: String -> ActionT m a #
Functor m => Functor (ActionT m) Source #
Instance details Defined in Language.GraphQL.Trans Methods fmap :: (a -> b) -> ActionT m a -> ActionT m b # (<$) :: a -> ActionT m b -> ActionT m a #
Monad m => Applicative (ActionT m) Source #
Instance details Defined in Language.GraphQL.Trans Methods pure :: a -> ActionT m a # (<>) :: ActionT m (a -> b) -> ActionT m a -> ActionT m b # liftA2 :: (a -> b -> c) -> ActionT m a -> ActionT m b -> ActionT m c # (>) :: ActionT m a -> ActionT m b -> ActionT m b # (<*) :: ActionT m a -> ActionT m b -> ActionT m a #
Monad m => Alternative (ActionT m) Source #
Instance details Defined in Language.GraphQL.Trans Methods empty :: ActionT m a # (<\|>) :: ActionT m a -> ActionT m a -> ActionT m a # some :: ActionT m a -> ActionT m [a] # many :: ActionT m a -> ActionT m [a] #
Monad m => MonadPlus (ActionT m) Source #
Instance details Defined in Language.GraphQL.Trans Methods mzero :: ActionT m a # mplus :: ActionT m a -> ActionT m a -> ActionT m a #
MonadIO m => MonadIO (ActionT m) Source #
Instance details Defined in Language.GraphQL.Trans Methods liftIO :: IO a -> ActionT m a #

newtype Context Source #

Resolution context holds resolver arguments.

Constructors

Context
Fields arguments :: Arguments

argument :: Monad m => Name -> ActionT m Value Source #

Retrieves an argument by its name. If the argument with this name couldn't be found, returns Null (i.e. the argument is assumed to be optional then).