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binding.pryの使い方

Last updated at Posted at 2019-10-02

デバッグツールのbinding.pryの基本的な使い方の備忘録

  1. gemfileにbinding.pryを記述
  2. ターミナルでbundle insatall を実施する
  3. 動作を止めたいところ(変数の中身を確認したいところ)に挿入する。
user_contorller.rb
def login
    @user = User.find_by(
      email:params[:email],
      password:params[:password]
    )
    binding.pry
    if @user
      flash[:notice] = "ログインしました"
      redirect_to action: :index
    else
      @error_message = "メールアドレスまたはパスワードが間違っています"
      @email = params[:email]
      @password = params[:password]
      render action: :login_form
    end  
  end

アクションに該当する動作を実施するとターミナルに以下のように表示される。

    40: def login
    41:   @user = User.find_by(
    42:     email:params[:email],
    43:     password:params[:password]
    44:   )
    45:   binding.pry
 => 46:   if @user
    47:     flash[:notice] = "ログインしました"
    48:     redirect_to action: :index
    49:   else
    50:     @error_message = "メールアドレスまたはパスワードが間違っています"
    51:     @email = params[:email]
    52:     @password = params[:password]
    53:     render action: :login_form
    54:   end  
    55: end

あとはterminalで確認したい中身の変数をたたけば確認できる!


[1] pry(#<UsersController>)> @user
=> nil
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