[RUBY] [Rails] Put together the same code with controller actions

Put the same code into a method.

Before summarizing

controller.erb


  def edit
    @post = Post.find(params[:id])
  end

  def show
    @post = Post.find(params[:id])
  end

After summarizing

Write set_post in private and call it with before_action.

controller.erb



before_action :set_post, only: [:edit, :show]

  def edit
  end

  def show
  end

private
  def set_post
    @post = Post.find(params[:id])
  end

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