我是个 ruby 新手，正在学习七牛云存储的一些 gem，这个 gem 十分好使，并且在给出的 demo 里面运行良好 就是这个：https://github.com/huobazi/qiniu_direct_uploader 以下是实现表单的代码：

<%= qiniu_uploader_form callback_url: qiniu_callback_path,
     bucket:        'mosite',
     id:            "photograph-uploader",
     key:           "items/#{Date.today.strftime('%Y/%m')}/{timestamp}-{unique-id}-#{SecureRandom.hex}-{filename}",
     custom_fields: {iid:"#{@item.id}",bbb:2},
     progress_bar_id: 'progress-bar',
     callbackBody: "name=$(fname)&key=$(key)&iid=$(iid)\
                     &bbb=$(bbb)&iwd=12345",
     drop_paste_zone_id: 'dropzone' do %>

当我喜闻乐见的把 demo 中的表单搬到我的 project 里面的时候，我惊奇的发现{timestamp}、{filename}、{unique-id}等变量全挂了

Started POST "/images/qiniu_callback" for 127.0.0.1 at 2015-05-25 22:11:14 +0800
Processing by ImagesController#qiniu_callback as */*
  Parameters: {"etag"=>"FmNco5xtUQvPhZOdMiqVBFG8fiJM", "fname"=>"df2.jpeg", "fsize"=>"131663", "mimeType"=>"image/jpeg", "imageInfo"=>{"format"=>"jpeg", "width"=>"853", "height"=>"640", "colorModel"=>"ycbcr"}, "endUser"=>"", "key"=>"items/2015/05/{timestamp}-{unique-id}-3e545506ff0541cbd4d08f06e57a45ef-{filename}", "custom_fields"=>{"iid"=>"105", "bbb"=>"2"}, "xyz"=>"100"}

当然，demo 里面的是没问题的，应该是这样的：

Parameters: {"etag"=>"FmNco5xtUQvPhZOdMiqVBFG8fiJM", "fname"=>"df2.jpeg", "fsize"=>"131663", "mimeType"=>"image/jpeg", "imageInfo"=>{"format"=>"jpeg", "width"=>"853", "height"=>"640", "colorModel"=>"ycbcr"}, "endUser"=>"", "key"=>"items/2015/05/1432563304845-ny1pk2yr4fgupr3exgsfh4-9091677139ee85f92e54ad1dc34208bf-df2.jpeg", "custom_fields"=>{"iid"=>"51", "bbb"=>"2"}, "xyz"=>"100"}

就这样，上传到七牛空间本来应该是有名字的文件都被字符串“filename”取代了，这样就很蛋疼。 那么像{timestamp}、{filename}、{unique-id}这样的变量到底是什么变量？应该不是 ruby 变量，是一个 js 变量么？ 于是我去除了多余的 js，仅仅保留了

//= require jquery
//= require jquery_ujs
//= require turbolinks
//
//= require_tree .

这几行，以避免 js 冲突，但是还是显示{filename} = =

求帮助 QUQ

我修改了 gem 的版本，将版本锁定到 0.0.4，结果就没有问题了

Parameters: {"etag"=>"FmNco5xtUQvPhZOdMiqVBFG8fiJM", "fname"=>"df2.jpeg", "fsize"=>"131663", "mimeType"=>"image/jpeg", "imageInfo"=>{"format"=>"jpeg", "width"=>"853", "height"=>"640", "colorModel"=>"ycbcr"}, "endUser"=>"", "key"=>"items/2015/05/1432644798226-cypsqzdouy0c5wduf0umkr-5328df4f5c501e33a62de28639af9c06-df2.jpeg", "custom_fields"=>{"iid"=>"108", "bbb"=>"2"}, "xyz"=>"100"}