class BlogController < ApplicationController
  layout 'application'
  before_filter :find_post, only: [:show]

  def index
    @posts = BlogPost.all
  end

  def show
    if stale?(@post, public: true)
      render text: @post.html, layout: true
    end
  end

  private

  def find_post
    @post = BlogPost.find params[:id]
    redirect_to blog_index_path unless @post
  end

end

class BlogController < ApplicationController
  before_filter :find_post, only: [:show]

  def index
    @posts = BlogPost.all
  end

  def show
    if stale?(@post, public: true)
      render text: @post.html, layout: true
    end
  end

  private

  def find_post
    @post = BlogPost.find params[:id]
    redirect_to blog_index_path unless @post
  end

end

Remove unneeded layout call in blog controller
Remove unneeded layout call in blog controller
