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我在修改Yesod腳手架時遇到了麻煩。我有我的實體,像這樣在/配置/車型描述:Yesod持久功能無法從處理程序訪問。我應該包括什麼?
Artist
ident Int
value Text
這裏是我在/Handler/Artist.hs
{-# LANGUAGE QuasiQuotes, TypeFamilies, GeneralizedNewtypeDeriving, TemplateHaskell,
OverloadedStrings, GADTs, FlexibleContexts #-}
module Handler.Artist where
import Import
import qualified Control.Monad.IO.Class as M
import Text.Hamlet (shamlet)
import Text.Blaze.Html.Renderer.String (renderHtml)
import Database.Persist
import Database.Persist.Sqlite
import Database.Persist.TH
import Control.Monad.IO.Class (liftIO)
getArtistR = concatMap (renderListElement . value) $ artists
where artists = selectList ([] :: [Filter Artist]) []
renderListElement name = renderHtml [shamlet|<li>#{name}|]
處理器(包括我和冗餘:))
最後,我的錯誤:
Rebuilding application... (using cabal)
Handler/Artist.hs:14:45: Not in scope: `value'
Build failure, pausing...
我不知道我應該做的!我需要在處理程序中扔入類似$(widgetFile "artist")
的東西嗎?補丁哪裏出問題了?任何幫助將如此真棒。先謝謝你!!!