ruby on rails - Implement "add to favorites" -

i creating app user can favorite room. started has_and_belongs_to_many association. noticed tricky implement remove button drestroy. decided time has_many through association. have users should add rooms favorite or wishlist. unfortunately when click on favorite button getting error:

what missing how can make work?

if need further information let me know. have used direction.

implement "add favorites" in rails 3 & 4

favorite_room.rb

class favoriteroom < applicationrecord     belongs_to :room     belongs_to :user end 

room.rb

belongs_to :user has_many :favorite_rooms   has_many :favorited_by, through: :favorite_rooms, source: :user 

user.rb

 has_many :rooms  has_many :favorite_rooms   has_many :favorites, through: :favorite_rooms, source: :room 

routes.rb

 resources :rooms     put :favorite, on: :member  end 

rooms_controller.rb

before_action :set_room, only: [:show, :favorite] ... ... def favorite     type = params[:type]     if type == "favorite"       current_user.favorites << @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

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

create_favorite_rooms.rb (migration file)

class createfavoriterooms < activerecord::migration[5.0]   def change     create_table :favorite_rooms |t|       t.integer :room_id       t.integer :user_id        t.timestamps     end   end end