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Assigning an image from a URL using Dragonfly

I use Dragonfly for image processing in a Rails 3.1 application. I am struggling with assigning model images using URLs.

I have this working tone in the form:

<%= form_for [@word, @game, @picture], :html => {:multipart => true} do |f| %> 
  <%= f.hidden_field :retained_image %>
  <p>
    <%= f.label :image, "upload pic" %><br />
    <%= f.file_field :image %>
  </p>
  <p>
    <%= f.label :image_url, "or pic URL" %><br />
    <%= f.text_field :image_url %>
  </p>
  <p>
    <% if @picture.image_uid? %>
    <label>Remove Picture?</label>
    <%= f.check_box :remove_image %>
    <% end %>
  </p>
  <p><%= f.submit %></p>
<% end %>

Dragonfly documentation says:

Dragonfly provides an accessory for assignment directly from the URL:

@album.cover_image_url = 'http://some.url/file.jpg'

But still, when I try in the console,

 => #<Picture id: nil, game_id: nil, user_id: nil, created_at: nil, updated_at: nil, image_uid: nil> 
ruby-1.9.2-p290 > picture.image_url = "http://i.imgur.com/QQiMz.jpg"
 => "http://i.imgur.com/QQiMz.jpg" 
ruby-1.9.2-p290 > picture
 => #<Picture id: nil, game_id: nil, user_id: nil, created_at: nil, updated_at: nil, image_uid: nil>

It seems to be returning the URL string that I am trying to pass to Dragonfly, but not opening and stretching the image, as in the form.

Is there something I don't see when trying to assign an image based on the url? It seems like this should be pretty straight forward, but I can't get anything to work on the ruby ​​console.

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2

, ? , ( URL-)

picture.image


picture.image.size

?

image_uid, , picture.image, .

URL- , . "" , .

+8

, : image_url : image_uid . .

: image_url, . : : image_url , : image_url .

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