问Rails:为博客选择前6篇文章，然后选择第7篇，依此类推

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

  # GET /posts
  # GET /posts.json
  def index
    @posts = Post.all
  end

  # GET /posts/1
  # GET /posts/1.json
  def show
    @posts = Post.all.order('created_at DESC')
    @topsix = @posts.take(6)
  end

  # GET /posts/new
  def new
    @post = current_user.posts.build
    @categories = Category.all.map{|c| [ c.name, c.id ] }
  end

  # GET /posts/1/edit
  def edit
    @categories = Category.all.map{|c| [ c.name, c.id ] }
  end

  # POST /posts
  # POST /posts.json
  def create
   @post = current_user.posts.build(post_params)
   @post.category_id = params[:category_id]
     respond_to do |format|
       if @post.save
          format.html { redirect_to @post, notice: "post was successfully created." }
           format.json { render :show, status: :created, location: @post }
       else
           format.html { render :new }
           format.json { render json: @post.errors, status: :unprocessable_entity }
       end
    end
  end

  # PATCH/PUT /posts/1
  # PATCH/PUT /posts/1.json
  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html { redirect_to @post, notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @post }
      else
        format.html { render :edit }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
    @post.category_id = params[:category_id]
  end

  # DELETE /posts/1
  # DELETE /posts/1.json
  def destroy
    @post.destroy
    respond_to do |format|
      format.html { redirect_to posts_url, notice: 'Post was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def post_params
      params.require(:post).permit(:title, :excerpt, :create_date, :author, :body, :category_id, :image)
    end
end

class HomeController < ApplicationController
  def index
    @posts = Post.all.order('created_at DESC')
    @topsix = @posts.take(6)
    @first3 = @posts.order('created_at DESC').take(3)
    @sidebar = @posts.take(3)
    @first4 = @posts.take(4)
    @first = @posts.take(1)
  end
end

<div class="row no-gutters">
  <% @topsix.select { |post| post > 6 } %>
    <div class="col-md-2"><%= image_tag post.image.url(:large), class: "img-responsive"%>
      <h6 class="small-title"><%= link_to post.title, post %></h6>
    </div>
  <% end %>
</div>