Rails 抛出错误而不是验证

Question

我正在构建一个相当简单的 Rails 5 应用程序。您创建“电影”，然后可以为这些电影创建“评论”。 Rails 正在做一些奇怪的事情。我已经设置了我的应用程序，因此我没有“新”操作和相应的视图，而是在 application.html.erb 文件中包含的模式中创建新电影的表单。然后我在控制器中为所有电影视图提供@newmovie = Movie.new，因此数据在任何地方都可用。

我有这样的电影对象设置验证：

 class Movie < ApplicationRecord
   has_many :reviews 
   validates :title, :director, :poster, :synopsis, presence: true
 end

当我填写表单以在索引视图的模态中创建新电影并故意将字段留空（以触发验证）时，我得到：

而不是表单根本不接受输入。这里发生了什么？我不能像这样发生这个错误。以前，我有一个“新”的看法。这在以前的设置中没有发生。救命！

这是我的整个电影控制器：

class MoviesController < ApplicationController

    before_action :find_movie, only: [:show, :edit, :update, :destroy ]
    before_action :authenticate_user!, only: [:new, :create, :edit, :update, :destroy]
    before_action :find_newmovie, only: [:show, :index, :new, :edit]

    def show
        @reviews = @movie.reviews.all.order(created_at: :desc).paginate(:page => params[:page], :per_page => 3)
        @review = Review.new
        if @movie.reviews.blank?
            @average_review = 0
        else
            @average_review = @movie.reviews.average(:rating).round(2)
        end
    end 

    def index 
        @movies = Movie.all.order(title: :asc).paginate(:page => params[:page], :per_page => 3)
        @newmovie = Movie.new
    end 

    def new
        @movie = Movie.new
    end 

    def create
        @movie = Movie.create(movie_params)
        @movie.user_id = current_user.id
        if @movie.save
            flash[:success] = "Your movie was created!"
            redirect_to root_path
        else
            flash[:danger] = "There was a problem with your request"
            render :new 
        end 
    end 

    def edit

    end 

    def update 
        if @movie.update(movie_params)
            flash[:success] = "Your movie was updated"
            redirect_to movie_path 
        else 
            flash[:danger] = "There was a problem with your request"
        end
    end 

    def destroy 
        if @movie.destroy
            flash[:success] = "Your movie was removed"
            redirect_to movies_path 
        else 
            flash[:danger] = "There was a problem with your request"
            render :index
        end 
    end 

    private 

        def movie_params 
            params.require(:movie).permit(:title, :director, :poster, :synopsis, :user_id)
        end 

        def find_movie 
            @movie = Movie.find(params[:id])
        end 

        def find_newmovie
            @newmovie = Movie.new
        end

end

Answer 1

在movies_controller 的new 操作中，您错过了初始化实例变量@newmovie。

在movies_controller中添加以下代码：

  class MoviesController < ApplicationController
    def new
      @newmovie = Movie.new
    end
   ...
  end