Ruby on rails 4 如何使用carrierwave上载现有项目的多个文件

这是my_form.html.erb中的附件代码

<div class="control-group">
      <%= f.label :attachment , :class => 'control-label' %>
      <div class="controls">
        <%= f.file_field :attachment, :class => 'file_field', multiple: 'true' %>
      </div>
    </div>

'控件标签'%>
“文件\字段”，多个：“真”%>

这是我的型号发票。\u details.rb

class InvoiceDetail < ActiveRecord::Base
    mount_uploader :attachment, AttachmentUploader
  #validates :invoice_number, :supplier_name, :attachment, presence: true # Make sure the owner's name is present.    
  #validates_uniqueness_of :invoice_number
 #validates :invoice_number, length: { maximum: 7 }
 #validates :supplier_name, length: { maximum: 20 }
 #validates :description_of_goods, length: { maximum: 50 }
 #validates :quatity, numericality: true
 #validates :price_per_unit, numericality: true
 #validates :total_amount, numericality: true
end

classinvoicedetail

这里是另一个模型invoice_file.rb

class InvoiceFile < ActiveRecord::Base
mount_uploader :attachment, AttachmentUploader # Tells rails to use this uploader for this model.
  validates :name, presence: true # Make sure the owner's name is present.  
end

class InvoiceFile

您可以使用文件字段输入在表单中添加动态嵌套字段，但这是一个糟糕的解决方案，因为这样，当有人试图一次上载20个文件时，您可能会遇到超时问题

我认为最简单、最快的解决方案是使用“jquery fileupload rails”gem。请检查演示应用程序的源代码，并根据您的应用程序进行调整

下面是一个很好的例子：