Display link in Rails form error message

Question

On our sign-up form, we validates_uniqueness_of :email

When the a user is attempting to use our sign up form and they specify an existing email address, I\'

Answer 1

Stumbled across this today:

http://api.rubyonrails.org/classes/ActionDispatch/Routing/UrlFor.html

If you need to access this auto-generated method from other places (such as a model), then you can do that by including ActionController::UrlFor in your class:

---

Step 1

Getting awareness of named routes to the model is the hard part; this gets me most of the way.

Now I can do something along the lines of

class User < ActiveRecord::Base
  include Rails.application.routes.url_helpers

  def reset_password_uri
    new_user_password_path(self)
  end
end

# User.find(1).reset_password_uri => "/users/password/new"

---

Step 2

So we have access to the named route, but now we need to inject it into the YAML message.

Here's what I just learned about YAML variables:

# en.yml
en:
  welcome: "Hello, %{username}!"

# es.yml
es:
  welcome: "¡Hola, %{username}!"

I can inject the username by including a hash with the t method

  <%= t :welcome, :username => @user.username %>

---

Step 3

Now we just need a way to add interpolation to the error message described in the original question. This is where I am currently stuck :(