Haskell 是的,从JSON创建字符串键
我有两个非常简单的模型定义:Haskell 是的,从JSON创建字符串键,haskell,yesod,persist,Haskell,Yesod,Persist,我有两个非常简单的模型定义: Page json uuid Text title Text UniquePageUuid uuid Primary uuid Link uuid Text href Text pageId PageId Maybe Primary uuid 我想构建一个JSON端点来更新链接模型中的pageId: data ApiLink { linkPageId :: PageId } deriving (Generic) instance
Page json
uuid Text
title Text
UniquePageUuid uuid
Primary uuid
Link
uuid Text
href Text
pageId PageId Maybe
Primary uuid
我想构建一个JSON端点来更新链接模型中的pageId:
data ApiLink { linkPageId :: PageId } deriving (Generic)
instance FromJSON ApiLink
我的处理程序看起来像这样:
patchApiLinkR :: LinkId -> Handler Value
patchApiLinkR linkId = do
jsonData <- requireJsonBody :: Handler ApiLink
link <- runDB $ update linkId [LinkPageId =. (linkPageId jsonData)]
returnJson link
link <- runDB $ update linkId [LinkPageId =. (Just $ linkPageId jsonData)]
patchApiLinkR::LinkId->Handler值
patchApiLinkR linkId=do
jsonData您必须稍微更改db查询,如下所示:
patchApiLinkR :: LinkId -> Handler Value
patchApiLinkR linkId = do
jsonData <- requireJsonBody :: Handler ApiLink
link <- runDB $ update linkId [LinkPageId =. (linkPageId jsonData)]
returnJson link
link <- runDB $ update linkId [LinkPageId =. (Just $ linkPageId jsonData)]
link@Alebon别担心,每个人都会这样!