如何显示特定的帖子？？ Rails 上的动作控制器 Ruby

Question

我正在尝试制作 Podcast 页面。在索引页面上，我想在顶部显示最新的播客，在中间显示下三个播客，其余全部在页面底部

比如我有25集，想像下面这样显示

25 at the top

22, 23, 24 in the middle

21,20,19,18 ~ 1 at the bottom

我的控制器

class PodcastsController < ApplicationController
  before_action :find_podcast, only: [:show, :edit, :update, :destroy]

  # GET /podcasts
  # GET /podcasts.json

  def index
    @podcasts = Podcast.order("created_at DESC").limit(1)

  end



  # GET /podcasts/1
  # GET /podcasts/1.json
  def show
    @podcasts = Podcast.all
  end

  # GET /podcasts/new
  def new
    @podcast = Podcast.new
  end

  # GET /podcasts/1/edit
  def edit
  end

  # POST /podcasts
  # POST /podcasts.json
  def create
    @podcast = Podcast.new(podcast_params)

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

  # PATCH/PUT /podcasts/1
  # PATCH/PUT /podcasts/1.json
  def update
    respond_to do |format|
      if @podcast.update(podcast_params)
        format.html { redirect_to @podcast, notice: 'Podcast was successfully updated.' }
        format.json { render :show, status: :ok, location: @podcast }
      else
        format.html { render :edit }
        format.json { render json: @podcast.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /podcasts/1
  # DELETE /podcasts/1.json
  def destroy
    @podcast.destroy
    respond_to do |format|
      format.html { redirect_to podcasts_url, notice: "#{@pocast.title} was successfully destroyed." }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def podcast_params
      params.require(:podcast).permit(:episode_url, :episode_title, :episode_description, :episode_audio_url, :episode_number)
    end
end

index.html.haml

%section.no-spacing
  .row   
    .columns.large-12
      - @podcasts.each do |podcast|
         %h3
           = podcast.episode_number
           = podcast.episode_audio_url
           = podcast.episode_description

到目前为止，我可以显示最新的一个，但坚持按降序显示三个（第 2、3、4）和其余页面（第 5 ~ 所有）。

在此先感谢您的帮助。

Answer 1

首先，将您的限制更改为 25。

def index
  @podcasts = Podcast
    .order("created_at DESC")
    .limit(25)
end

然后使用Array#shift从数组中取出你需要的元素。

latest = @podcasts.shift
next_three = @podcasts.shift(3)
the_rest = @podcasts

Answer 2

我会尝试这样的事情。
首先，制作一个干净的控制器和一个查询对象来处理播客列表逻辑会很棒。

class PodcastsController < ApplicationController

  def index
    podcast_query = PodcastQuery.new
    # this is one podcast object
    @most_recent_podcast = podcast_query.most_recent
    # these are arrays of podcasts
    @next_three_most_recent_podcasts = podcast_query.next_three_most_recent
    @remaining_podcasts = podcast_query.remaining
  end
end

# app/models/podcast_query.rb
class PodcastQuery
  def initialize
    @podcasts = Podcast.order("created_at DESC")
  end

  def most_recent
    @podcasts[0] || (raise StandardError.new "you need at least one Podcast")
  end

  def next_three_most_recent
    @podcasts[1..3] || []
  end

  def remaining
    @podcasts[4..-1] || []
  end
end

如何显示特定的帖子？？ Rails 上的动作控制器 Ruby

How to display specific posts?? Actioncontroller Ruby on Rails

ruby

actioncontroller

ruby-on-rails-4