使用复选框以的has_many关系 [英] Using check boxes with a has_many relationship

问题描述

我有一些行的发票。 A线只能属于一个发票。这是我的模式是这样的：

I have an invoice with some lines. A line can only belong to one invoice. This is how my schema looks like:

create_table "invoices" do |t|
end

create_table "lines" do |t|
  t.integer  "invoice_id"
end

和我的模型：

class Invoice < ActiveRecord::Base
  has_many :lines
end

class Line < ActiveRecord::Base
  belongs_to :invoice
end

现在，创建（或编辑）的发票我想告诉所有可能的行列表（行已经在数据库中存在），并有一个复选框每一行与发票联系起来的时候。

Now, when creating (or editing) an invoice I would like to show a list with all possible lines (the lines already exist in the database) and have a check box for each line to link it with the invoice.

我有一个看HABTM问题，但我不认为这就是我需要在这里，问题并不复杂。我认为这个问题是我想更新单元＃INVOICE_ID而我工作的发票。我能做到这一点的，嵌套表格还是我在这里需要一个before_save回调？

I had a look at the HABTM problem but I don't think that's what I need here, the problem isn't as complex. I think the problem is me wanting to update the Unit#invoice_id while I am working on the invoice. Can I do this with a nested form or do I need a before_save callback here?

谢谢！

推荐答案

一个的has_many协会还增加了访问 line_ids ，您可以创建复选框。

A has_many association also adds the accessor line_ids, which you can create check boxes for.

如果您使用的是 simple_form 或 formtastic 这是令人难以置信的简单：

If you're using simple_form or formtastic it's incredibly easy:

<%= f.input :line_ids, :as => :check_boxes %>

这将创造这样的事情：

Which will create something like this:

<span>
  <input name="invoice[line_ids][]" type="hidden" value="" />
  <input checked="checked" class="check_boxes optional" id="invoice_line_ids_1" name="invoice[line_ids][]" type="checkbox" value="1" />
  <label class="collection_check_boxes" for="invoice_line_ids_1">Line Name 1</label>
</span>

<span>
  <input name="invoice[line_ids][]" type="hidden" value="" />
  <input checked="checked" class="check_boxes optional" id="invoice_line_ids_2" name="invoice[line_ids][]" type="checkbox" value="2" />
  <label class="collection_check_boxes" for="invoice_line_ids_2">Line Name 2</label>
</span>

这是所有有给它。没有嵌套的表格或其他任何需要的。

And that is all there is to it. No nested forms or anything else needed.

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