NoMethodError eventHough动作定义了什么？

Question

我正在尝试建立一个用户可以预订房间的网站。我有一个工作中最喜欢的功能，但仅在用户登录时。如果访问者只想查看单个房间的show.html.erb，我会收到此错误：

我实际上已定义了收藏夹。

如何让访问者能够查看单个房间的show.html.erb？

rooms_controller.rb

before_action :set_room, only: [:show, :favorite]
...
...

  def favorite
    type = params[:type]
    if type == "favorite"
      current_user.favorites << @room unless current_user.favorites.exists?(@room)
      redirect_to wishlist_path, notice: 'You favorited #{@room.listing_name}'
    elsif type == "unfavorite"
      current_user.favorites.delete(@room)
      redirect_to wishlist_path, notice: 'Unfavorited #{@room.listing_name}'
    else
      # Type missing, nothing happens
      redirect_to wishlist_path, notice: 'Nothing happened.'
    end
  end


  private
    def set_room
      @room = Room.find(params[:id])
    end

show.html.erb（会议室）

<% if current_user.favorites.exists?(@room) %>
   <%= link_to "unfavorite", favorite_room_path(@room, type: "unfavorite"), method: :put %>
<% else %>
   <%= link_to "favorite",   favorite_room_path(@room, type: "favorite"), method: :put %>
<% end %>

我有一个用户，房间和favorite_room模型：

favorite_room.rb

belongs_to :room
belongs_to :user

user.rb

has_many :favorite_rooms # just the 'relationships'
has_many :favorites, through: :favorite_rooms, source: :room # the actual rooms a user favorites

room.rb

has_many :favorite_rooms # just the 'relationships'
has_many :favorited_by, through: :favorite_rooms, source: :user # the actual users favoriting a room

Answer 1

您可以查看是否已定义current_user 试试这段代码

<% if current_user && current_user.favorites.exists(@room) %>
  # your if
<% else %>
  # your else
<% end %>