title: Ruby on Rails: How to customize validation error message?
body: <p>I have a following code:</p>
  
  <pre><code>validates :name, :presence =&gt; true
  </code></pre>
  
  <p>Error message produced is "Name can't be blank"
  Instead of using the actual attribute name (in this case "name") I want to 
  display message as "Registration name can't be blank".
  How do I overwrite the default message on the validations? I tried appending :message
  but it didn't work...</p>
  
  <p>Thanks!</p>