custom validation error messages with html

Question

Is there a way to add html to custom validation error messages within the validates function?

For example:

class Product < ActiveRecord::Base
  validates :legacy_code, :format => { :with => /\A[a-zA-Z]+\z/,
    :message => "Only letters allowed <a href=\"www.example.com\"> Check here </a> " }
end

Doing the above simply gives a string literal without the browser interpreting it as html with the tag.

I tried using locale but it seems like a more complicated way to do it. I've googled a bunch of websites and also tried to override the field_error_proc method.

For example:

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
  errors = Array(instance.error_message).join(',')
  %(#{html_tag}<span class="validation-error">&nbsp;#{errors}</span>).html_safe

end

The above works but gives twice the number of error messages than intended.

Any help here will be greatly appreciated.

Solved by using .html_safe in error message partial:

<% if @user.errors.any? %>
  <div id="error_explanation">
    <div class="alert alert-error">
      The form contains <%= pluralize(@user.errors.count, "error") %>.
    </div>
    <ul>
    <% @user.errors.full_messages.each do |msg| %>
      <li>* <%= msg.html_safe %></li>
    <% end %>
    </ul>
  </div>
<% end %>

Answer 1

When you output your error, use raw

<%= raw f.errors %>