在Rails4中找不到预期的行为

Question

我正在将我的应用程序从rails3升级到rails4。在friendship.controller.rb中我有一行@friend = User.find（params [：friend_id]）当然这应该识别友谊表中与friend_id值相对应的id的朋友。它返回一个空白。 User.find（params [：id]）返回340，这是友谊的id

有任何想法吗？

class FriendshipController < ApplicationController
  include ProfileHelper
  before_filter :setup_friends

  def create
    Friendship.request(@user, @friend)
    user = @user
    friend = @friend

    #MakeMailer.friend_request(user,friend).deliver

    flash[:notice] = "Friend request sent."
    redirect_to user_path(@user.id)
  end

  def accept
    if @user.requested_friends.include?(@friend)
      Friendship.accept(@friend, @user)
      flash[:notice] = "Friendship with #{@friend.login} accepted!"
    else
      flash[:notice] = "No friendship request from #{@friend.login}."
    end
    redirect_to user_path(@user.id)
  end

  def decline
    if @user.requested_friends.include?(@friend)
      Friendship.breakup(@user, @friend)
      flash[:notice] = "Friendship with #{@friend.login} declined"
    else
      flash[:notice] = "No friendship request from #{@friend.login}."
    end
    redirect_to user_path(@user.id)
  end

  def cancel
    if @user.pending_friends.include?(@friend)
      Friendship.breakup(@user, @friend)
      flash[:notice] = "Friendship request canceled."
    else
      flash[:notice] = "No request for friendship with #{@friend.login}"
    end
    redirect_to user_path(@user.id)
  end

  def delete
    if @user.friends.include?(@friend)
      Friendship.breakup(@user, @friend)
      flash[:notice] = "Friendship with #{@friend.login} deleted!"
    else
      flash[:notice] = "You aren't friends with #{@friend.login}"
    end
    redirect_to user_path(@user.id)
  end

  private

  def setup_friends
    @user = @current_user
    @friend = User.where(:id => params[:friend_id])
  end
end