在 Ruby on Rails 中复制父记录和关联子记录的最佳方法? [英] Best way to duplicate parent and associated child records in Ruby on Rails?

问题描述

可能的重复:
ActiveRecord:如何克隆嵌套关联?

我有一个带有 invoices 的表格，而它又可以包含许多 items.

I have a table with invoices which in turn can have many items.

现在在我的 invoices 索引视图中，我想在每个 invoice 旁边放置一个链接，上面写着 Duplicate Invoice.

Now in my invoices index view I would like to place a link next to each invoice saying Duplicate Invoice.

如果没有子记录，这会很容易:

Without the child records this would be quite easy:

<%= link_to "Duplicate", new_invoice_path(invoice.attributes) %>

但是，如果发票的items 也应该被复制，这怎么办?

But how can this be done if the invoice's items should be duplicated as well?

作为一个 Rails 新手，我无法理解这个问题.所有这些都可以通过我的控制器中的 new 操作来处理吗?

As a Rails newbie I can't get my head around this. Can all this be handled by the new action inside my controller?

def new
  @invoice = current_user.invoices.build(:project_id => params[:project_id])
  @title = "New invoice"
end

或者我是否需要创建另一个名为例如的函数copy 在我的控制器里面?

Or do I need to create another function named e.g. copy inside my controller?

最佳做法是什么?

感谢您的任何意见...

Thanks for any input...

推荐答案

逻辑应该在模型中

在invoice.rb中:

def deep_dup
  new_invoice = Invoice.create(self.dup.attributes)
  items.each do |item|
    new_invoice.items.create(item.dup.attributes)
  end
  return new_invoice
end

然后在控制器中，做一个名为duplicate的动作:

Then in the controller, make an action called duplicate:

def duplicate
  new_invoice = @invoice.deep_dup
  redirect to new_invoice
end

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