ruby-on-rails - Backbone + Rails 'Paperclip' 异步上传

Question

我正在使用主干和 rails 'paperclip' gem 实现异步照片上传:

问题:

我需要使用 jQuery 上传(或等效的库)吗？

如果是这样，我是否只需覆盖 photocollection.sync 来调用库？

项目.rb

class Item < ActiveRecord::Base
   has_many: photos
   ...

照片.rb

class Photo < ActiveRecord::Base

  attr_accessible :photo
  belongs_to :item

  has_attached_file :photo
...

ItemView.js.coffee

class MySite.Views.Items.Edit extends Backbone.View

  template: JST['items/edit']

  initialize: ->
    @modelBinder = new Backbone.ModelBinder
    @model.on('change', @render(), this)

  events: ->
    'submit #edit_item_form' : 'save_item'

  render: ->
    $(@el).html @template( item: @model )

    @new_photo = @model.new_photo()

    @modelBinder.bind @model, $("#item_fields")
    @modelBinder.bind @new_photo, $("#photo_fields")
    @

  save_item: (e) ->
    e.preventDefault()
    @model.save()
    @new_photo.save()

编辑.jst.eco

<form id="edit_item_form" accept-charset="UTF-8" data-remote="true" enctype="multipart/form-data">
<div id="item_fields"> .... </div>
<div id="photo_fields">
   <input type="file" id="upload_photo" name="photo[photo]" />
</div>
...

欢迎提出整体设计改进的建议

Answer 1

我最终选择了 iframe 上传的简单性和跨浏览器支持。实现实际上非常简单:

MyView.js.coffee:

  events: ->
    'change #upload_photos' : 'upload_photo'

  upload_photo: (e) ->
    upload_frame = $('#add_photo_form')
    upload_frame.prop 'target', 'upload_frame'
    upload_frame.submit()

MyTemplate.jst.eco:

<form id="add_photo_form" method="POST" action="/api/v1/photos" enctype="multipart/form-data">
  <div id="photo_fields">
      <input type="file" id="upload_photos" name="photo[photo]" multiple>
      <input type="hidden" name="authenticity_token" value="<%= $("meta[name='csrf-token']").attr("content") %>">
  </div>
</form>
<iframe id='upload_frame' name='upload_frame' src=''></iframe>

请注意 CSRF token 的添加。没有它，请求将失败并清除您的 session 。