从复选框构建数组时 form_for 的语法 [英] Syntax for form_for when building an array from checkboxes

问题描述

我正在为 Order 对象创建一个表单，并且该订单通过名为 OrderProducts 的连接表包含许多产品.所以，我们有这样的事情:

I'm making a form for an Order object, and the order has many Products, via a join table called OrderProducts. So, we've got something like this:

<% @order = Order.new %>
<% form_for @order do |f| %>
  <% @products.each do |product| %>
    ... want to iterate over products here to build up "order[product_ids][]", with one checkbox per product
  <% end %>
<% end %>

通常对于每个产品，我都会有一个 check_box_tag，说

Usually for each product i would have a check_box_tag, saying

<%= check_box_tag "order[product_ids][]", product.id, @order.product_ids.include?(product.id) %>

但这虽然工作正常，但总感觉有点像警察.有没有办法用 f.check_box 语法来做到这一点?重要说明 - 关于我在 Rails 2.2.2 中工作的相关项目，因此适用于 rails 2 的解决方案将是理想的.

But this, while working fine, always feels like a bit of a cop out. Is there a way i can do it with the f.check_box syntax? Important note - on the project in question I'm working in Rails 2.2.2, so a solution that works in rails 2 would be ideal.

推荐答案

Rails <= 2.x(原创)

<% @products.each do |product| -%>

  <% fields_for 'product[]' , product do |product_fields| -%>

    [...]
    <%= product_fields.check_box :id %>

  <% end -%>

<% end -%>

Rails >= 3.x(更新)

<% @products.each do |product| -%>

  <%= fields_for 'product[]' , product do |product_fields| -%>

    [...]
    <%= product_fields.check_box :id %>

  <% end -%>

<% end -%>

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