Untitled

gem Paperclip interpolation

MODEL    

    model/contract.rb

      has_many :contract_files

 

    model/contract_file.rb

      has_attached_file :data

 

CONSOLE

Loading development environment (Rails 3.1.0)

 

1.9.2p290 :001 > cont = Contract.first

 

  Contract Load (0.1ms)  SELECT "contracts".* FROM "contracts" LIMIT 1    

         => #Contract id: 1, organization: "Com.org", and etc ....

 

1.9.2p290 :002 > cont.contract_files

 

  ContractFile Load (0.2ms)  SELECT "contract_files".* FROM "contract_files"

     WHERE "contract_files"."contract_id" = 1    

         => #[ContractFile id: 88, caption: "asdf", and etc ...]

       

model/contract_files.rb    

      has_attached_file :data,

      :url => "/assets/paperclip/:contract_id/:filename"

       

Contract.find( params[:id] ).contract_files.map { |cf| cf.data.url }

# Dont't forget to handle nonexistent id

       

#model/contract_file.rb

has_attached_file :data, :path => "public/contracts/:parent_id/assets/paperclip/:id.:extension", :url => "/contracts/:parent_id/assets/paperclip/:id.:extension"

 

Paperclip.interpolates :parent_id do |a, s|

    a.instance.contract.id

end