post.html.erb

<!-- app/views/houdini_templates/post.html.erb -->

<h2>Review the image for offensiveness</h2>

<h3>Instructions</h3>
<p>Please review the image below.</p>

<img src="<%= post.image_url %>"><br/>

<input type="radio" name="flagged" value="yes" class="required">
  Yes, this picture is offensive
</input>

<input type="radio" name="flagged" value="no" class="required">
  No, this picture is okay
</input>

post.rb

# app/models/post.rb
# Additional notes for me:
#   * change :on_submit to :after_submit
#   * send success, errors to :after_submit instead of response, body
#   * Use :title as :identifier?

class Post < ActiveRecord::Base
  include Houdini::Model

  houdini :moderates_image,
    :price => '0.01',
    :title => 'Please moderate image',
    :form_template => 'app/views/houdini_templates/post.html.erb',
    :on_postback => :process_image_moderation_answer

  after_create :moderate_image

  def moderate_image
    Houdini::send_to_houdini(self)
  end

  def process_image_moderation_answer(answer)
    update_attribute(:flagged => answer[:flagged] == 'yes')
  end
end