我要寻找一个解决方案，让用户通过一个是，file_field上传多张图片的能力。我特地到选项，例如jQuery的文件上传和Uploadify，但还没有遇到很好的例子有一个有效的解决方案。

I am looking for a solution to give the user the ability to upload multiple images through one file_field. I have looked in to options such a Jquery File Upload and Uploadify but have yet to come across good examples with a working solution.

我已经有多个图像设置，

I already have multiple images setup,

 has_attached_file :asset,
                   :styles => { :large => "640x480", :medium => "300x300", :thumb => "100x100" },
                   :storage => :s3,
                   :s3_credentials => "#{Rails.root}/config/s3.yml",
                   :path => "/:contributor_id/:listing_name/:filename"

现在我显示5个人file_fields

Right now I am displaying 5 individual file_fields

def new
  @listing = Listing.new
  5.times {@listing.assets.build }

  respond_to do |format|
    format.html # new.html.erb
    format.json { render json: @listing }
  end
end

我想有

<%= f.file_field :asset, :multiple => true %>

这允许用户选择在他们的文件浏览多个文件。但我怎么能处理这些与嵌套模式？并让他们上传。

That allows the user to select multiple files in their file browser. But how can I process these with a nested model? And get them to upload.

推荐答案

因此​​，有一些问题在这里。

So there are a few issues here.

首先，回形针的 has_​​attached_file 的方法是不是关联到多个文件。它看起来像你试图建立一个资产，如果它是一个Rails的关联。所有的回形针也就是把几个字段到表来存储有关文件的一些元数据，你会得到每声明 has_​​attached_file 中的一个附加的文件。如果您要附加5个文件，你需要做的是这样的：

First, Paperclip's has_attached_file method isn't an association to many files. It looks like you're trying to build an "asset" as if it's a Rails association. All Paperclip does is put a couple of fields into your table to store some meta-data about the file and you get one attached file per declaration of has_attached_file. If you want to attach 5 files, you would need to do something like:

has_attached_file :asset1
has_attached_file :asset2
has_attached_file :asset3
has_attached_file :asset4
has_attached_file :asset5

，或者，你可以创建另一个模型只是存储文件。例如：

OR, alternatively, you could create another model just to store the files. For example:

class Listing < ActiveRecord::Base
  has_many :assets
end

class Asset < ActiveRecord::Base
  belongs_to :listing
  has_attached_file :picture
end

这样的话，你可能会连接到一个房源的多个资产（你没有说什么，原来的目标是，所以我只是把它叫做上市）。

That way, you could have multiple assets attached to one listing (you didn't say what the original object was so I just called it "listing").

二，有没有这样的东西作为一个多文件上传的HTML（，正因为如此，在的是，file_field 方法并不需要 ：多=＆GT;真参数你将不得不使用一些超越内置的，如果你想多文件上传表单处理的Rails Uploadify是一个不错的选择（我以前使用过）。有是一个宝石，将改变文件中的字段使用uploadify（并支持：多=＆GT;真语法，你想要的）：https://github.com/mateomurphy/uploadify_rails3/wiki.但是，我不能担保它有多好。

Second, there is no such thing as a multiple file upload in HTML (and, as such, the file_field method doesn't take a :multiple => true argument. You'll have to use something beyond Rails built-in form handling if you want multiple-file upload. Uploadify is a decent choice (that I've used before). There is a gem that will transform file fields to use uploadify (and will support the :multiple => true syntax that you want): https://github.com/mateomurphy/uploadify_rails3/wiki. However, I cannot vouch for how good it is.

我的建议是，开始一步一步的。通过快速上传到Rails的可以是涉及到处理您的形式CSRF元标记等领域一个复杂的过程。开始通过使一种形式，其允许用户上传一个文件，并将其存储通过回形针。那么，也许打破 has_​​attached_file 声明成另一种模式，这样你可以有1或模型（如上图所示，在多模式code座）相关的许多文件。然后尝试加入Uploadify或另一种选择。厄尼·米勒对整合Uploadify一个体面的教程：http://erniemiller.org/2010/07/09/uploadify-and-rails-3/.

My advice would be to start step-by-step. Uploading via Flash to Rails can be a complicated process that involves dealing with the CSRF meta-tag and other fields in your form. Start by making a form that allows a user to upload one file and stores it through Paperclip. Then maybe break the has_attached_file declaration into another model so that you can have 1 or many files associated with a model (as shown in the multi-model code block above). Then try adding Uploadify or another alternative. Ernie Miller has a decent tutorial on integrating Uploadify: http://erniemiller.org/2010/07/09/uploadify-and-rails-3/.

要开始，请记住， has_​​attached_file 只能附加的一个的文件。当您尝试调用 @ listing.assets 不存在资产。还有的的的资产。你需要自己创建一个单独的模型，并用Rails的协会，如果你想多个文件。

To start, remember that has_attached_file can only attach one file. When you try calling @listing.assets there is no "assets". There is an asset. You need to create a separate model yourself and use Rails' associations if you want multiple files.