Pastable version of DRY it up please

<pre class='prettyprint' language='ruby'>class Car &lt; ActiveRecord::Base
  belongs_to :model
  has_many :photos
  #
  # Figure out the path of the car image requested.
  #
  def image_path(which)
    img_url = &quot;http://s3.carfinancechief.com.au&quot;
    case which
    when &quot;search&quot;
      dimension = &quot;200x100&quot;
      photo = find_photo(&quot;F&quot;)
    when &quot;module&quot;
      dimension = &quot;100x50&quot;
      photo = find_photo(&quot;F&quot;)
    when &quot;main&quot;
      dimension = &quot;418x155&quot;
      photo = find_photo(&quot;F&quot;)
    end
    
    if(!photo.nil?)
      case which
      when &quot;search&quot;
        if(photo.has_img_search)
          url = &quot;#{img_url}/car/#{photo.filename.downcase}_#{dimension}.jpg&quot;
        else 
          url = &quot;#{img_url}/not-yet_#{dimension}.jpg&quot;
        end  
      when &quot;module&quot;
        if(photo.has_img_module)
          url = &quot;#{img_url}/car/#{photo.filename.downcase}_#{dimension}.jpg&quot;
        else 
          url = &quot;#{img_url}/not-yet_#{dimension}.jpg&quot;
        end        
      when &quot;main&quot;
        if(photo.has_img_main)
          url = &quot;#{img_url}/car/#{photo.filename.downcase}_#{dimension}.jpg&quot;
        else 
          url = &quot;#{img_url}/not-yet_#{dimension}.jpg&quot;
        end
      end
    else
      url = &quot;#{img_url}/not-yet_#{dimension}.jpg&quot;
    end
    url
  end
  
  private  # ---------------------------------------------------------
  
  def find_photo(view)
    photo = photos.find_by_view(view)
    photo
  end
end</pre>
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Pastable version of DRY it up please