Rails 4.評論中的NoMethodError＃new

Question

建立電影評論網站，用戶可以上傳電影，但是當任何人想要通過點擊寫評論按鈕來評論電影時，我會在評論中發現錯誤NoMethodError＃new。所以在我的代碼，它進入_form reviews.html.erb

_form.reviews.html.erb

<％=的form_for（[@電影，@review]）做| F | ％> - 錯誤

<% if @review.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@review.errors.count, "error") %> prohibited this review from being saved:</h2> 

     <ul> 
     <% @review.errors.full_messages.each do |message| %> 
     <li><%= message %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

    <div class="field"> 
    <%= f.label :rating %><br> 
    <%= f.number_field :rating %> 
    </div> 
    <div class="field"> 
    <%= f.label :comment %><br> 
    <%= f.text_area :comment %> 
    </div> 
    <div class="actions"> 
    <%= f.submit %> 
    </div> 
<% end %> 

審查controller.rb

class ReviewsController < ApplicationController 
    before_action :set_review, only: [:show, :edit, :update, :destroy] 
    before_action :set_movie 
    before_action :authenticate_user! 


    respond_to :html 

    def new 
    @review = Review.new 
    respond_with(@review) 
    end 

    def edit 
    end 

    def create 
    @review = Review.new(review_params) 
    @review.user_id = current_user.id 
    @review.movie_id = @movie.id 

    if @review.save 
    redirect_to @movie 
    else 
    render 'new' 
    end 

    end 

    def update 
    @review.update(review_params) 
    respond_with(@review) 
    end 

    def destroy 
    @review.destroy 
    respond_with(@review) 
    end 

    private 
    def set_review 
     @review = Review.find(params[:id]) 
    end 

    def set_movie 
     @movies = Movie.find(params[:movie_id]) 
    end 


    def review_params 
     params.require(:review).permit(:rating, :comment) 
    end 
end 

電影控制器

class MoviesController < ApplicationController 
    before_action :set_movie, only: [:show, :edit, :update, :destroy] 
    before_action :authenticate_user!, except: [:index, :show] 


    def index 
    @movies = Movie.all 
    end 


    def show 
    end 

    def new 
    @movie = current_user.movies.build 
    end 

    # GET /movies/1/edit 
    def edit 
    end 

    # POST /movies 
    # POST /movies.json 
    def create 
    @movie = current_user.movies.build(movie_params) 

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

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

    # DELETE /movies/1 
    # DELETE /movies/1.json 
    def destroy 
    @movie.destroy 
    respond_to do |format| 
     format.html { redirect_to movies_url, notice: 'Movie was successfully destroyed.' } 
     format.json { head :no_content } 
    end 
    end 

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

    # Never trust parameters from the scary internet, only allow the white list through. 
    def movie_params 
     params.require(:movie).permit(:title, :description, :movie_length, :director, :rating, :image) 
    end 
end 

耙路線

new_movie_review GET /movies/:movie_id/reviews/new(.:format)  reviews#new 



NoMethodError in Reviews#new 
Showing /Users/neilpatel/Desktop/Rails/movies/app/views/reviews/_form.html.erb where line #1 raised: 

undefined method `reviews_path' for #<#<Class:0x007f92db41b548>:0x007f92dd52ff18> 

Trace of template inclusion: app/views/reviews/new.html.erb 

Rails.root: /Users/neilpatel/Desktop/Rails/movies 

Application Trace | Framework Trace | Full Trace 
app/views/reviews/_form.html.erb:1:in `_app_views_reviews__form_html_erb__1769795460297873272_70134360199660' 
app/views/reviews/new.html.erb:3:in `_app_views_reviews_new_html_erb___894596083071563840_70134360230600' 
app/controllers/reviews_controller.rb:11:in `new' 

寫評論按鈕

條

<div class="panel panel-default"> 
    <div class="panel-body"></div> 
    <div class="row"> 
     <div class="col-md-4"> 
     <%= image_tag @movie.image.url(:medium) %> 
     <div class="table-responsive"> 
      <table class="table"> 
      <tbody></tbody> 
      <tr> 
       <td><strong>Title:</strong></td> 
       <td><%= @movie.title %></td> 
      </tr> 
      <tr> 
       <td><strong>Description:</strong></td> 
       <td><%= @movie.description %></td> 
      </tr> 
      <tr> 
       <td><strong>Movie Length:</strong></td> 
       <td><%= @movie.movie_length %></td> 
      </tr> 
      <tr> 
       <td><strong>Director:</strong></td> 
       <td><%= @movie.director %></td> 
      </tr> 
      <tr> 
       <td><strong>Rating:</strong></td> 
       <td><%= @movie.rating %></td> 
      </tr> 
      </table> 
      <%= link_to "Write a Review", new_movie_review_path(@movie) %> 
     </div> 
    </div> 
</div> 



<%= link_to 'Edit', edit_movie_path(@movie) %> | 
<%= link_to 'Back', movies_path %> 

配置路線

Rails.application.routes.draw do 


    devise_for :users 
    resources :movies do 
    resources :reviews, except: [:show, :index] 
    end 

    root 'movies#index' 
end 

Answer 1

您有：

@movies = Movie.find(params[:movie_id]) 

在 set_movie方法

。你應該有：

@movie = Movie.find(params[:movie_id])