宝石回形针插值

美好的一天。
我有导轨3.1。和宝石回形针
在我的应用程序来管理公司的合同：
宝石回形针插值

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 ...]

问题
善待，请告诉我，我怎么能提取合同编号：1在

model/contract_files.rb  
     has_attached_file :data, 
     :url => "/assets/paperclip/:contract_id/:filename"

示例我想要获取的信息
在http // localhost：3000/contracts/1上获取此类文件的路径： http//localhost:3000/contracts/1/assets/paperclip/1/XXX.pdf http // localhost：3000/contracts/1/assets/paperclip/1/XXY.pdf http // localhost：3000/contracts/1 /assets/paperclip/1/XXZ.pdf

非常感谢您的帮助。

来源

2012-02-04 itsnikolay

如果我能说清楚，你可以这样来做：

Contract.find(params[:id]).contract_files.map { |cf| cf.data.url } 
# Dont't forget to handle nonexistent id

UPD

放置contract_id的网址，你应该恢复默认回形针：url和：路径参数是这样的：

#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

来源

2012-02-04 16:58:50 icanhazbroccoli

1.9.2p290：007 cont.contract_files.map {| cf | cf.data.url} => [“/assets/paperclip/data/88/original/download.jpg?1328369668”]但你可以看到仍然没有contract.id – itsnikolay 2012-02-04 17:12:48

Getiing错误http：//img40.imageshack .us/img40/836/screenshotat20120204212.png – itsnikolay 2012-02-04 17:33:28

ContractFile定义中是否有belongs_to：contract指令？ – icanhazbroccoli 2012-02-04 17:36:40

宝石回形针插值

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