신규 사용자 등록 양식의 동의 확인란(밸리데이션) 구현

1.View

<h1>新規ユーザ登録フォーム</h1>

<div class="row">
    <div class="col-md-6 col-md-offset-3">
        <%= form_for(@user) do |f| %>


            ...省略...


            <%= f.check_box :agreement, :as => :boolean, checked:false %>
            利用規約とプライバシーポリシーに同意する

            <%= f.submit "Create my account", class: "btn btn-large btn-primary" %>

        <% end %>
    </div>
</div>

2. Model

class User < ActiveRecord::Base

  validates_acceptance_of :agreement, allow_nil: false, on: :create

  ...省略...

end

3. Controller

  def create
    @user = User.new(user_params)
    if @user.save
      flash[:success] = "登録が完了しました！"
      redirect_to @user
    else
      render 'new'
    end
  end

  def user_params
    params.require(:user).permit(:name, :email, :password, :password_confirmation, :agreement)
  end
end

구현 완료!

참고