Question

我有两个关于故事和类别的控制器，他们独自工作。现在我想在添加新闻时添加选择已创建的类别。我该如何连接它们以及如何使用select标签在new.html.erb中显示所有类别？

class StoriesController < ApplicationController
  def index
    @stories = Story.all
  end

  def show
    @story = Story.find(params[:id])
  end

  def new
    @story = Story.new
  end

  def create
    @story = Story.new(params[:story])

    if @story.save
      redirect_to stories_path, :notice => "Your story was saved"
    else
      render "new"
    end
  end

  def edit
    @story = Story.find(params[:id])
  end

  def update
    @story = Story.find(params[:id])

    if @story.update_attributes(params[:story])
      redirect_to stories_path, :notice => "Your story has been updated"
    else
      render "edit"
    end
  end

  def destroy
    @story = Story.find(params[:id])
    @story.destroy
    redirect_to stories_path, :notice => "Your story has been deleted"
  end
end

class CategoriesController < ApplicationController
  def index
    @categories = Category.all
  end

  def new
    @category = Category.new
  end

  def create
    @category = Category.new(params[:category])

    if @category.save
      redirect_to categories_path, :notice => "Your category was saved"
    else
      render "new"
    end
  end

  def edit
    @category = Category.find(params[:id])
  end

  def update
    @category = Category.find(params[:id])

    if @category.update_attributes(params[:category])
      redirect_to categories_path, :notice => "Your category has been updated"
    else
      render "edit"
    end
  end

  def destroy
    @category = Category.find(params[:id])
    @category.destroy
    redirect_to categories_path, :notice => "Your category has been deleted"
  end
end

Answer 1

并不是您需要将控制器连接在一起。您只需要StoriesController来查询类别列表，并将其放入类变量中，以便视图可以使用它。

class StoriesController < ApplicationController
  ...
  def new
    @categories = Category.all
    @story = Story.new
  end

Answer 2

您可以尝试：

# app/controllers/stories_controller.rb
def new
  @categories = Category.all
  @story = Story.new
end

# app/views/stories/_form.html.erb
<%= form_for @story do |f| %>
  #....
  <%= f.collection_select :category_id, @categories, :id, :title %>

Answer 3

嘿，在控制器中你只能访问类别的标题。制作一系列cattegories标题而不是类别对象数组。

    # app/controllers/stories_controller.rb
    def new
     @categories = Category.all.map(&:title)
     @story = Story.new
    end

如何连接两个控制器

3 个答案: