How does one use s3_host_alias and s3_alias_url to get the Cloudfront URL?

[Matt M]

I've been trying to use the s3_host_alias option to specify my
cloudfront URL, but the #url method keeps returning the
s3.amazonaws.com url.

Here's my Picture model with the attachment:

class Picture < ActiveRecord::Base

has_attached_file :image, :path =>
"images/:class/:id/:basename.:style.:extension",
:storage => :s3,
:s3_credentials => "#{RAILS_ROOT}/config/
s3.yml",
:bucket => 'themesagogo',
:s3_host_alias =>
'themesagogo1.thrivesmart.net'

validates_attachment_size :image, :less_than => 1.megabytes

end


And here's how I'm calling URL:

@picture.image.url


Is there something I'm missing in the options sent to
has_attached_file, or am I calling the wrong method (something other
than .url)?

I hope this has an easy answer - I just couldn't find any documented
examples of it anywhere.

Thanks!

[Matt M]

Solution found, looked at test examples. I needed to include :url =>
':s3_alias_url'

[Victor Stan]

Thanks this is what I was looking for . For example completeness I will include my setup:

  has_attached_file :background_image,

       :styles => {

       :thumb    => ["100x100#", :jpg],

       :original => ["1680x1050>", :jpg] },

     :storage => :s3,

     :s3_credentials => "#{Rails.root}/config/s3.yml",

     :url => ':s3_alias_url',

     :s3_host_alias => "example.cloudfront.net",

     :path => "/:class/:id/:style/:clean_filename",

     :default_style => :original,

     :default_url => '/assets/rails.png',

     :convert_options => { :thumb => "-quality 60", :original =>  "-quality 70", :all => '-strip -trim'}