목표

오류 메시지 표시

구현

<% if model.errors.any? %>
  <div id="error_explanation" class="alert alert-warning">
    <ul class="mb-0">
      <% model.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

밸리데이션

class User < ApplicationRecord
  before_save { email.downcase! }
  validates :name, presence: true, length: { maximum: 50 }
  validates :email, presence: true, length: { maximum: 255 },
                    format: { with: /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i },
                    uniqueness: { case_sensitive: false }
  has_secure_password

  <h1>Sign up</h1>

    <%= form_with(model: @user) do |f| %>
     <%= render 'layouts/error_messages', model: f.object %>

      <div>
        <%= f.label :name, 'Name' %>
        <%= f.text_field :name, class: 'form-control' %>
      </div>

      <div>
        <%= f.label :email, 'Email' %>
        <%= f.email_field :email, class: 'form-control' %>
      </div>

      <div>
        <%= f.label :password, 'Password' %>
        <%= f.password_field :password, class: 'form-control' %>
      </div>

      <div>
        <%= f.label :password_confirmation, 'Confirmation' %>
        <%= f.password_field :password_confirmation, class: 'form-control' %>
      </div>

      <%= f.submit 'Sign up', class: 'btn btn-primary' %>
    <% end %>