Redirect_to and Preservation of Errors

Working on my side project, Pecunia-Nunc, I was baffled when the errors on the object creation form would not display upon submission. The controller looked like this

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class SubscribersController < ApplicationController

def new
  require 'digest'
  @subscriber = Subscriber.new(params[:subscriber])
  @subscriber.token = Digest::SHA1.hexdigest([Time.now, rand].join)
  if @subscriber.save
      flash[:notice] = "Thanks for signing-up. Please confirm your email address through the email that'll be in your inbox shortly!"

      redirect_to home_path
  else
      flash[:notice] = "There were errors! Please resubmit after making corrections."
      redirect_to home_path
  end  
end
...

The view :

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

As you can tell, the problem was not in the view at all, but in this line redirect_to home_path. Redirection clears the object.errors field, and therefore nothing was being displayed. I stupidly spent a lot of time fiddling with the view, instead of inspecting the controller action. Replacing the problematic line with render 'new' (‘new’ is the action/view that renders the form) solved the problem by preserving the .errors object.

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