controller.erb
  def edit
    @post = Post.find(params[:id])
  end
  def show
    @post = Post.find(params[:id])
  end
Écrivez set_post in private et appelez-le avec 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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