How to display validation error message in Rails?

Question

Ruby on Rails

If validation is present in the User model, such as:
validates :name, :login, presence: true, then if this validation is not observed, errors should be displayed.
How can I display a list of errors in the view and where are these messages located in order to change them ???

Answer 1

Example of error output:

<% if @article.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@article.errors.count, "error") %> prohibited this article from being saved:</h2>
    <ul>
    <% @article.errors.full_messages.each do |msg| %>
      <li><%= msg %></li>
    <% end %>
    </ul>
  </div>
<% end %>

Read about changing error messages here: rusrails.ru/rails-internationalization-i18n-api

Answer 2

rusrails.ru/active-record-validations

Answer 3

@user.errors.full_messages.join(', ')

Answer 4

Make yourself a partial, for example _error_messages.html.erb
, and then before each form, where errors will be displayed, render this partial.
for example you have a registration form

<%= form_for(@user, url: register_attempt_path, html: { class: 'form-wrapper form-medium' }) do |f| %>
    <%= render 'shared/error_messages', object: f.object %>
<%= f.text_field :username, class: 'form-control margin_form_control', placeholder: 'username' %>
<% end %>