title: Carrierwave get image by url
body: <p>I need to get some images by the url.</p>
  
  <p>The urls are like <a href="http://img.wallsbay.com/large/2014/05/2665.jpg" rel="nofollow">http://img.wallsbay.com/large/2014/05/2665.jpg</a> but 2014 and 2665 are changings.</p>
  
  <p>My controller has this params:</p>
  
  <pre><code>  def image_params
      params.require(:image).permit(:content, :remote_content_url, :id)
    end
  </code></pre>
  
  <p>And i tried to get image from the url like this:</p>
  
  <pre><code>@image.remote_content_url = 'http://img.wallsbay.com/large/#{:content}/05/#{:id}jpg'
  </code></pre>
  
  <p>but remote_content_url is undefined method.</p>