Rails 友好 ID - 找不到 id=electronics 的类别

Question

我正在尝试在 Ruby on Rails 4.0 中开发一个应用程序（已经使用过这个令人难以置信的框架的旧版本），但遇到了一些麻烦。

我安装了FriendlyID gem，我认为一切正常，但是当我尝试测试我的应用程序时收到错误消息。

如果我去http://0.0.0.0:3000/categories/1，这行得通。但是当我点击这个页面中的“编辑”，或者只是去http://0.0.0.0:3000/categories/electronics（这是ID为1的类别的slugged名称）时，我收到以下错误：

Couldn't find Category with id=electronics
# Use callbacks to share common setup or constraints between actions.
def set_category
   @category = Category.find(params[:id])  #Here's pointed the error
end

类别型号：

class Category < ActiveRecord::Base 

    extend FriendlyId
    friendly_id :name, use: :slugged

    # Validations
    validates_uniqueness_of :name, :case_sensitive => false

end

类别控制器：

（由脚手架生成用于测试目的）

class CategoriesController < ApplicationController
  before_action :set_category, only: [:show, :edit, :update, :destroy]

  # GET /categories
  # GET /categories.json
  def index
    @categories = Category.all
  end

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

  # GET /categories/new
  def new
    @category = Category.new
  end

  # GET /categories/1/edit
  def edit
  end

  # POST /categories
  # POST /categories.json
  def create
    @category = Category.new(category_params)

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

  # PATCH/PUT /categories/1
  # PATCH/PUT /categories/1.json
  def update
    respond_to do |format|
      if @category.update(category_params)
        format.html { redirect_to @category, notice: 'Category was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @category.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /categories/1
  # DELETE /categories/1.json
  def destroy
    @category.destroy
    respond_to do |format|
      format.html { redirect_to categories_url }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def category_params
      params.require(:category).permit(:name)
    end
end

迁移：##

（我在创建Category表后添加了friendlyId，但我认为还可以）

class AddColumnToCategory < ActiveRecord::Migration
  def change
    add_column :categories, :slug, :string
    add_index :categories, :slug, unique: true
  end
end

路线：

resources :categories

希望你能帮助我。 我在 Rails 4.0 中做错了什么？

Answer 1

Check the doc，友好的 id 停止破解 find 方法（为了更大的利益），你现在必须这样做：

# Change Category.find to Category.friendly.find in your controller
Category.friendly.find(params[:id])

Answer 2

您现在可以使用：

extend FriendlyId friendly_id :name, use: [:finders]

在你的模型中。