Ruby on Rails ActiveRecord :: AssociationTypeMismatch с ассоциациями

Question

Я пытаюсь создать очень базовое тестовое приложение, чтобы пользователи могли добавлять рецепты в свои «избранные». Я настроил пользователь, рецепт и любимые модели и я в основном следуя руководству, как размещен в верхнем комментарии ниже: Implement "Add to favorites" in Rails 3 & 4

Однако, я получаю «ActiveRecord :: AssociationTypeMismatch в RecipesController # любимых» ошибка.

Вот мои модели:

class User < ActiveRecord::Base 
    # Include default devise modules. Others available are: 
    # :confirmable, :lockable, :timeoutable and :omniauthable 
    devise :database_authenticatable, :registerable, 
     :recoverable, :rememberable, :trackable, :validatable 
    has_many :recipes 

    # Favorite recipes of user 
    has_many :favorite_recipes # just the 'relationships' 
    has_many :favorites, through: :favorite_recipes, source: :recipe # the actual recipes a user favorites 
end 

class Recipe < ActiveRecord::Base 
    belongs_to :user 

    # Favorited by users 
    has_many :favorite_recipes # just the 'relationships' 
    has_many :favorited_by, through: :favorite_recipes, source: :user # the actual users favoriting a recipe 
end 

class FavoriteRecipe < ActiveRecord::Base 
    belongs_to :recipe 
    belongs_to :user 
end 

А вот контроллер:

class RecipesController < ApplicationController 
    before_action :set_recipe, only: [:show, :edit, :update, :destroy] 
    before_action :authenticate_user! 

    # GET /recipes 
    # GET /recipes.json 

    def favorite 
     type = params[:type] 
    if type == "favorite" 
     current_user.favorites << @recipe 
     redirect_to :back, notice: 'You favorited #{@recipe.name}' 

    elsif type == "unfavorite" 
     current_user.favorites.delete(@recipe) 
     redirect_to :back, notice: 'Unfavorited #{@recipe.name}' 

    else 
     # Type missing, nothing happens 
     redirect_to :back, notice: 'Nothing happened.' 
    end 
    end 

    def index 
    @recipes = Recipe.all 
    end 

    # GET /recipes/1 
    # GET /recipes/1.json 
    def show 
    end 

    # GET /recipes/new 
    def new 
    @recipe = Recipe.new 
    end 

    # GET /recipes/1/edit 
    def edit 
    end 

    # POST /recipes 
    # POST /recipes.json 
    def create 
    @recipe = Recipe.new(recipe_params) 

    respond_to do |format| 
     if @recipe.save 
     format.html { redirect_to @recipe, notice: 'Recipe was successfully created.' } 
     format.json { render :show, status: :created, location: @recipe } 
     else 
     format.html { render :new } 
     format.json { render json: @recipe.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    # PATCH/PUT /recipes/1 
    # PATCH/PUT /recipes/1.json 
    def update 
    respond_to do |format| 
     if @recipe.update(recipe_params) 
     format.html { redirect_to @recipe, notice: 'Recipe was successfully updated.' } 
     format.json { render :show, status: :ok, location: @recipe } 
     else 
     format.html { render :edit } 
     format.json { render json: @recipe.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    # DELETE /recipes/1 
    # DELETE /recipes/1.json 
    def destroy 
    @recipe.destroy 
    respond_to do |format| 
     format.html { redirect_to recipes_url, notice: 'Recipe was successfully destroyed.' } 
     format.json { head :no_content } 
    end 
    end 


    private 
    # Use callbacks to share common setup or constraints between actions. 
    def set_recipe 
     @recipe = Recipe.find(params[:id]) 
    end 

    # Never trust parameters from the scary internet, only allow the white list through. 
    def recipe_params 
     params.require(:recipe).permit(:user_id, :title) 
    end 
end 

код, я использую в целях включения любимого добавления:

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

полная ошибка я получаю:

ActiveRecord::AssociationTypeMismatch in RecipesController#favorite 
    Recipe(#70327608659260) expected, got NilClass(#17178580) 

    Extracted source (around line #11): 

09   type = params[:type] 
10  if type == "favorite" 
11  current_user.favorites << @recipe 
      redirect_to :back, notice: 'You favorited #{@recipe.name}' 

     elsif type == "unfavorite" 

Любая помощь была бы принята с благодарностью. Большое спасибо

Answer 1

Ваш @recipe является nil ... Вам нужно установить @recipe для favorite действия тоже:

class RecipesController < ApplicationController 
    before_action :set_recipe, only: [:show, :edit, :update, :destroy, :favorite] 
...