ActiveModel :: ForbiddenAttributesError - / attr_access

Question

我克隆了一些源代码来研究这个railscast（https://github.com/railscasts/253-carrierwave-file-uploads）。当时可能使用不推荐的attr_accessible方法完成了Rails 3。

我正在使用Rails 4，所以我在模型中注释了attr_accessible方法

class Gallery < ActiveRecord::Base
  #attr_accessible :name
  has_many :paintings
end

我在控制器中添加了一个私有部分，并使用了适当的方法

private

def gallery_params
  params.require(:gallery).permit(:name)
end

它应该是straithgforward但我仍然得到这个错误。

ActiveModel::ForbiddenAttributesError

任何新鲜的眼睛能帮助我吗？感谢。

EDIT 这是控制器的完整源代码

class GalleriesController < ApplicationController

def index
  @galleries = Gallery.all
end

def show
  @gallery = Gallery.find(params[:id])
end

def new
  @gallery = Gallery.new
end

def create
  @gallery = Gallery.new(params[:gallery])
  if @gallery.save
  flash[:notice] = "Successfully created gallery."
  redirect_to @gallery
else
  render :action => 'new'
end
end

def edit
  @gallery = Gallery.find(params[:id])
end

def update
  @gallery = Gallery.find(params[:id])
  if @gallery.update_attributes(params[:gallery])
    flash[:notice] = "Successfully updated gallery."
  redirect_to gallery_url
else
  render :action => 'edit'
end
end

def destroy
  @gallery = Gallery.find(params[:id])
  @gallery.destroy
  flash[:notice] = "Successfully destroyed gallery."
  redirect_to galleries_url
end

private

def gallery_params
  params.require(:gallery).permit(:name)
end
end

和Gemfile的源代码

source 'https://rubygems.org'
gem 'rails', '4.2.5'
gem 'sqlite3'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc
gem 'protected_attributes'
gem 'bcrypt', '~> 3.1.7'

group :development, :test do
  console
    gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
gem 'web-console', '~> 2.0'
gem 'spring'
end