目前，我有几种使用嵌套属性的表单。我最近发现了 Dropzone JS，所以我想以我正在使用的各种形式实现它。
我有两个类似的模型:
游戏
class Games < ActiveRecord::base
has_many :screenshots, dependent: :destroy
accepts_nested_attributes_for :screenshots, allow_destroy: true
end
截图
class Screenshot < ActiveRecord::Base
belongs_to :game
mount_uploader :ssfile, ScreenshotUploader
end
通常，我会用这样的方式处理它:
new.html.haml
- content_for :breadcrumbs do
%h3.text-center New Game
.col-md-12#content
.row
= render 'form'
.row
.col-md-12
= link_to 'Back', games_path
_form.html.haml
.col-md-12
= form_for @game, :html => {:class => 'form-horizontal form-bordered'} do |f|
.section-title
%h3 General Data
.well
.form-group
=f.label :title, :class => 'col-md-2'
.col-md-6
= f.text_field :title, :class => 'form-control'
.form-group
= f.label :platform, :class => 'col-md-2'
.col-md-6
.input-group
= f.text_field :platform, :class => 'form-control'
.section-title
%h3 Screenshots
.well#screenshots
=f.fields_for :screenshots do |i|
=render 'screenshot_fields', :f => i
%hr
.links
=link_to_add_association 'Add Screenshot', f, :screenshots, :class => 'btn btn-default'
.row
.col-md-12
.actions
= f.submit 'Save', :class => 'btn btn-default'
_screenshot_fields.html.haml
.form-group
-if f.object.ssfile?
.col-md-2
=image_tag(f.object.ssfile_url(:thumb))
.col-md-4
%p
=f.file_field :ssfile, :class => 'styledfileinput'
-if f.object.ssfile?
.col-md-2
%p
=f.check_box :_destroy
=f.label :_destroy, 'Remove'
这很好用。当您单击“添加屏幕截图”时，它会加载 link_to_add_association 助手，它是名为 Cocoon 的 gem 的一部分。该助手将创建必要的 JS 以将代码“ block ”添加到表单，在本例中为文件输入，但通常您会有更多其他类型的输入，而不仅仅是一个。
我想用多文件拖放区替换 link_to_add_association 添加的 block 。
我对 new.html.haml View 进行了以下更改:
.col-md-12
= form_for @game, :html => {:class => 'form-horizontal form-bordered', :id => 'gameform'} do |f|
-# *snip*
.well#screenshots
- @game.screenshots.each do |i|
=image_tag i.ssfile_url(:thumb)
%hr
.row
.col-md-12
.actions
= f.submit 'Save', :class => 'btn btn-default'
我将 #gameform 添加到 form_for 元素，并替换了显示图片的循环。到目前为止，一切都很好。现在的问题是我不知道文件应该如何与表单交互。
我在加载 Dropzone 配置的 coffeescript 上有这个:
ready = ->
if $('#gameform').length > 0
didthiswork = new Dropzone("#gameform", {
paramName: "game[screenshot_attributes][ssfile]"
})
else
console.log('ruh roh')
$(document).on('page:load ready', ready)
现在，我可以单击表单中的任意位置，它会显示上传对话框(这本身就是另一个问题)，但是一旦我选择了图片，这些图片就无法正确保存。有没有办法使它与 fields_for 一起工作？我有很多其他表单使用非常相似的配置，所以我更希望不必更改我的应用程序的整个逻辑(如果可能的话)。
更新
我想我已经取得了一些进步。我已经设法让表单发送数据，但是它们并没有像我期望的那样到达。
我使用此链接中的信息调整了配置:https://github.com/enyo/dropzone/wiki/Combine-normal-form-with-Dropzone
在我的 coffesscript 上产生了这样的结果:
Dropzone.options.articuloform =
autoProcessQueue: false
uploadMultiple: true
paramName: "game[screenshot_attributes][ssfile]"
parallelUploads: 100
maxFiles: 100
init: ->
myDropzone = this
# First change the button to actually tell Dropzone to process the queue.
@element.querySelector('input[type=submit]').addEventListener 'click', (e) ->
# Make sure that the form isn't actually being sent.
e.preventDefault()
e.stopPropagation()
myDropzone.processQueue()
return
# Listen to the sendingmultiple event. In this case, it's the sendingmultiple event instead
# of the sending event because uploadMultiple is set to true.
@on 'sendingmultiple', ->
# Gets triggered when the form is actually being sent.
# Hide the success button or the complete form.
return
@on 'successmultiple', (files, response) ->
# Gets triggered when the files have successfully been sent.
# Redirect user or notify of success.
return
@on 'errormultiple', (files, response) ->
# Gets triggered when there was an error sending the files.
# Maybe show form again, and notify user of error
return
return
这可以防止在我选择图像时自动上传数据(这很好)，但是，一旦我按下提交按钮，数据就会以错误的结构到达。他们在来自数据中是这样到达的:
Parameters: {
"utf8"=>"✓",
"authenticity_token"=>"l2siCG2D4xW0eto48WM152MTusc6K5cQYem8K2a9c/Y=",
"game"=>{
"title"=>"Super Amazing AAA Title",
"platform"=>"Xbox One",
"screenshot_attributes"=>{
"ssfile"=>{
"0"=>#<ActionDispatch::Http::UploadedFile:0x000000055c7e98 @tempfile=#<Tempfile:/tmp/RackMultipart20150408-9276-14rfzqm>,
@original_filename="screenshot01.png",
@content_type="image/png",
@headers="Content-Disposition: form-data; name=\"game[screenshot_attributes][ssfile][0]\"; filename=\"screenshot01.png\"\r\nContent-Type: image/png\r\n">,
"1"=>#<ActionDispatch::Http::UploadedFile:0x000000055c7df8 @tempfile=#<Tempfile:/tmp/RackMultipart20150408-9276-1opclgk>,
@original_filename="screenshot02.png",
@content_type="image/png",
@headers="Content-Disposition: form-data; name=\"game[screenshot_attributes][ssfile][1]\"; filename=\"screenshot02.png\"\r\nContent-Type: image/png\r\n">,
"2"=>#<ActionDispatch::Http::UploadedFile:0x000000055c7d30 @tempfile=#<Tempfile:/tmp/RackMultipart20150408-9276-16r4kdq>,
@original_filename="screenshot03.png",
@content_type="image/png",
@headers="Content-Disposition: form-data; name=\"game[screenshot_attributes][ssfile][2]\"; filename=\"screenshot03.png\"\r\nContent-Type: image/png\r\n">,
"3"=>#<ActionDispatch::Http::UploadedFile:0x000000055c7c90 @tempfile=#<Tempfile:/tmp/RackMultipart20150408-9276-qp1au3>,
@original_filename="screenshot04.png",
@content_type="image/png",
@headers="Content-Disposition: form-data; name=\"game[screenshot_attributes][ssfile][3]\"; filename=\"screenshot04.png\"\r\nContent-Type: image/png\r\n">,
"4"=>#<ActionDispatch::Http::UploadedFile:0x000000055c7ba0 @tempfile=#<Tempfile:/tmp/RackMultipart20150408-9276-8g3pap>,
@original_filename="screenshot05.png",
@content_type="image/png",
@headers="Content-Disposition: form-data; name=\"game[screenshot_attributes][ssfile][4]\"; filename=\"screenshot05.png\"\r\nContent-Type: image/png\r\n">
}
}
},
"null"=>"",
"commit"=>"Save",
"id"=>"2"
}
重要的部分是每个片段的名称，它们以game[screenshot_attributes][ssfile][XXXX]的形式到达，这是错误的，正确的格式应该是 game[screenshot_attributes][XXXX][ssfile]。我可以在上面粘贴的部分中配置它，但重要的部分是 paramName 部分，我将其作为 paramName: "game[screenshot_attributes][ssfile]"。
如果有人能提供任何线索，我将不胜感激。
最佳答案
终于找到了一种让 dropzone.js 使用 rails 嵌套属性的方法。您必须编辑 dropzone.js 来为多个附件设置 rails 嵌套属性数组的格式。
Dropzone.prototype._getParamName = function(n) {
if (typeof this.options.paramName === "function") {
return this.options.paramName(n);
} else {
return "" + this.options.paramName1 + (this.options.uploadMultiple ? "[" + n + "]" : "") + this.options.paramName2 + "";
}
};
然后在 dropzone 初始化 javascript 中初始化两个参数:
Dropzone.options.newTicket =
clickable:'#previews'
previewsContainer: "#previews"
dictDefaultMessage: "Drop files here or click to select files"
autoProcessQueue: false
uploadMultiple: true
paramName1: "ticket[attachments_attributes]"
paramName2: "[file]"
parallelUploads: 5
maxFiles: 5
addRemoveLinks: true
关于ruby-on-rails - Carrierwave 与 Dropzone JS。是否可以将它们与嵌套属性一起使用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29487666/