customize validation messages

问题:

i want to know how to fully customize validation messages, this is how my code looks like

user_profile.rb:-

validates: first_name, :presence => {:message => "First name can't be blank"}

but this gives me an error message user profile first name First name can't be blank and what i want is to have an error message First name can't be blank. I look around for solution and i think i have to do some changes in en.yml file, but i don't know what to do. Any help?

回答1:

You have three options:

validate do |user|
  user.errors.add_to_base("First name can't be blank") if user.first_name.blank?
end

or

Doing user_profile.errors.full_messages will give you -> ["First Name can't be blank"]

validates: first_name, :presence => {:message => "can't be blank"}

or

# config/locales/en.yml
en:
  activerecord:
    attributes:
      user_profile:
        first_name: "First name"
    errors:
      models:
        user_profile:
          attributes:
            first_name:
              blank: "can't be blank"

For more information on how to use locales, have a look at this

回答2:

Rails uses their own error handling. Which means that it shows the database column. This results into name of column *can't be blank.

Try using something like this and only thing you have to do is change your model.

<% if object.errors.any? %>
 <div id="error_explanation">
  <h2>
   <%= pluralize(object.errors.count, "error") %>
   probited this <%= object.class.to_s.underscore.humanize.downcase %> from being saved
  </h2>
  <p>There were problems with the following fields:</p>
  <ul>
  <% object.errors.full_messages.each do |message| %>
   <li><%= message %></li>
  <% end %>
  </ul>
 </div>


<% end %>

Besides that, I'd use Javascript/HTML5 validation for blank fields. To decrease bandwith usage. Hope this helps.