gistfile1.txt

@timeline.map do |post|
  {
    :id => post.id,
    :brand => {
     :id => post.brand.id,
     :name => post.brand.name,
     :updated_at => post.brand.updated_at,
     :attachments => post.brand.images.map do |image|
       {
         :id => image.id,
         :style => image.styles,
         :file => image.file_name,
         :endpoint => image.base_url
       }
     end
    },
    :updated_at => post.updated_at
  }
end