module Yesod.Persist
( YesodPersist (..)
, get404
, getBy404
, module Database.Persist
, module Database.Persist.TH
) where
import Database.Persist
import Database.Persist.TH
import Control.Monad.Trans.Class (MonadTrans (..))
import Control.Failure (Failure)
import Yesod.Handler
class YesodPersist y where
type YesodDB y :: (* -> *) -> * -> *
runDB :: YesodDB y (GGHandler sub y IO) a -> GHandler sub y a
get404 :: (PersistBackend (t m), PersistEntity val, Monad (t m),
Failure ErrorResponse m, MonadTrans t)
=> Key val -> t m val
get404 key = do
mres <- get key
case mres of
Nothing -> lift notFound
Just res -> return res
getBy404 :: (PersistBackend (t m), PersistEntity val, Monad (t m),
Failure ErrorResponse m, MonadTrans t)
=> Unique val -> t m (Key val, val)
getBy404 key = do
mres <- getBy key
case mres of
Nothing -> lift notFound
Just res -> return res