At the moment, if I try to do this inside a handler:
newPerson <- runDB $ update personId [PersonAge =. 27]
newPerson will have the type (). It seems that update doesn't yield any value, so if I want to get the updated entity, I need to do this:
newPerson <- runDB $ do
update personId [PersonAge =. 27]
get personId
Which results in newPerson having type Maybe Person, and some additional code to handle the Nothing case (or using fromJust). Is there a way to bypass the issue? Should there be? To me it makes sense for update to return the updated record, but should it really?
update returns (), use updateGet.
この記事はインターネットから収集されたものであり、転載の際にはソースを示してください。
侵害の場合は、連絡してください[email protected]
コメントを追加