使用playframework如何列出值

Question

get an error

Cannot use a method returning Unit as an Handler

inside Application

def listAllFriends(userId:Long){
    val myfriend:List[MyFriend]=MyFriend.listAllFriendByUser(userId)
    Ok(views.html.allFriends.render(myfriend))

  }

in views page

@(myFriends: List[MyFriend])

@for(myFriend <- myFriends){
    @myFriend.friend_Id <br>
}

In routes

GET  /allFriend     controllers.Application.listAllFriends(postId:Long)

And in model

model have myfriend got 4 values id,userId,friendId and isAccept. userId and FriendId are the ForeignKey from table UserProfile..

def listAllFriendByUser(user_Id:Long):List[MyFriend]={
     DB.withConnection { implicit connection =>
     val friendByUser= SQL(
         """
     select * from MY_FRIEND where USER_ID ={user_Id}   
     """).on(
         'user_Id -> user_Id).as(MyFriend.simple.*)  
         friendByUser
     }
   }

Answer 1

In routes, try :

  POST /allFriends        controllers.Application.listAllFriends(userId:Long)

See Play 2.0 framework - POST parameters

And in Application, you have missed the 'Action' :

def listAllFriends(userId:Long) = Action {...}

Answer 2

In your routes file you call the method listAllFriends() without argument, while it is defined as def listAllFriends(userId:Long). You must pass it the userId parameter...