Question

I have this (these) model(s)

Portfolio
-- PortfolioItem item
  -- Image image
     has_attachment :attachment

all with nice slugs and I would want the url of :attachment to reflect this organization, such as with a instance

photos/holiday_in_venice/ponte_vecchio (all slugs of the respective hierarchy)

would generate this url

photos(??)/holiday_in_venice(??)/:slug/:style.:extension

how would I access these antecessor objects during paperclip path/url creation?

currently I am only able to do

ponte_vecchio/small.png

Answer 1

You’ll need to create custom interpolations. After that you are able define a :url and a :path.

Put a file called paperclip.rb in your config/initializers/ folder and do something like this:

Paperclip.interpolates :portfolio_slug do |attachment, style|
  attachment.instance.portfolio_item.portfolio.title.parameterize
end

Paperclip.interpolates :portfolio_slug do |attachment, style|
  attachment.instance.portfolio_item.title.parameterize
end

After that you can use those interpolations like that:

has_attached_file :attachment, 
  :path=>":rails_root/public/photos/:portfolio_slug/:item_slug/:style.:extension",
  :url=>"/photos/:portfolio_slug/:item_slug/:style.:extension"