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Ruby on Rails中“ nil:NilClass的未定義方法'title'”錯誤

[英]“undefined method `title' for nil:NilClass” error in Ruby on Rails

我正在建立一個視頻網站,並且在嘗試向我的靜態頁面添加標題以供用戶觀看視頻時遇到此錯誤:

watch.html.erb

<div class="panel panel-default">
<div class="panel-body">
<div class="col-md-4">
    <p>You're watching:</p>
    <h1><%= @movie.title %></h1>
</div>
</div>
</div>

這是我的movies_controller.rb文件:

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

def watch
end

def index
@movies = Movie.all
end

def show
@reviews = Review.where(movie_id: @movie.id).order("created_at DESC")
end

def new
@movie = current_user.movies.build
end

def edit
end

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

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

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

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

private
def movie_params
  params.require(:movie).permit(:title, :description, :movie_length,     :director, :rating, :image)
end
end

我的watch方法位於控制器文件中的“ private”上方,這是出現此錯誤的主要原因之一。 但是每次我嘗試轉到該頁面時,仍然會出現錯誤。 有人可以告訴我我在做什么錯嗎?

錯誤消息非常清楚: @movienil watch動作中,您沒有嘗試將變量定義為nil以外的任何變量,並且非常清楚地填充@movie before_action回調未在其運行的動作列表中包括watch

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