Validating with ActiveModel in Ruby on Rails 4 Seemingly not Working

When I enter data into a form that I know should fail, it doesn't. As per my model below, I require the data to be any combination of a-z, A-Z, 0-9 and whitespace, and when I stuff the form with garbage like )(&^%^&(*&%^&** or even submit an empty field, I would expect there to be errors. In this case, there isn't.

Here's the salient part of the model:

class Numerology
  include ActiveModel::Model

  attr_accessor  :phrase

  VALID_PHRASE_REGEX = /\A[a-zA-Z0-9\s]+\z/

  validates :phrase, presence: true, length: { minimum: 1 },
            format: { with: VALID_PHRASE_REGEX }

Here's the controller...what I want it to do is go back to the index (the page with the form on it) with whatever errors are generated when I supply wrong input on the form. Not sure I'm going about it the right way here, but I think this might be a secondary question since I don't seem to get ANY errors generated at all (so of course @numerology.errors.any? would be false).

class NumerologiesController < ApplicationController
  before_filter :authenticate_user!
  respond_to :html

  def index
    @numerology = Numerology.new
  end

  def create
    @numerology = Numerology.new(params[:numerology])
    if @numerology.errors.any?
      render :index
    else
      @numresults = Numerology.analysis(params[:numerology][:phrase])
    end
  end

end

And then finally, here are the views, first the index and then the create:

The Index page:

<div class="center jumbotron">
  <h1>Numerology Analysis Module</h1>

  <br>
  <%= bootstrap_form_for(@numerology, layout: :horizontal, label_col: "col-sm-4", control_col: "col-sm-6") do |f| %>

    <p> Enter word or phrase to be analyzed in the field below (Required).</p>

    <%= @numerology.errors.full_messages.each do |message| %>
      <li><%= message %></li>
    <% end %>
    <%= f.text_field :phrase, label: "Word or Phrase: " %>

    <br><br>

    <%= f.submit "Perform Numerological Analysis" %>
  <% end %>
  <br><br>
  <%= image_tag("SMILE.jpg", alt: "Smiley Face") %>
</div>

The Create page:

<div class="center jumbotron">
  <h1>Numerological Analysis Report</h1>
  <div class="numreport">
    <table class="numtable">
      <% @numresults.each do |line| %>
        <% if !line.nil? %>
          <tr>
            <td><%= "#{line}" %></td>
          </tr>
        <% end %>
      <% end -%>
    </table>
  </div>
  <%= link_to "Perform Another Numerological Analysis - Click Here",   numerologies_path %>
  <br><br><br>
  <%= image_tag("SMILE.jpg", alt: "Smiley Face") %>
</div>

So,does anyone see what I'm doing wrong here? Suggest other things to try? Thanks!

You need to either call valid? or invalid? in order to populate the errors list.

http://api.rubyonrails.org/classes/ActiveModel/Validations.html#method-i-valid-3F

valid?(context = nil)

Runs all the specified validations and returns true if no errors were added otherwise false.

  def create
    @numerology = Numerology.new(params[:numerology])
    if @numerology.invalid?
      render :index
    else
      @numresults = Numerology.analysis(params[:numerology][:phrase])
    end
  end