Rails的3 HABTM形式选择下拉菜单 [英] Rails 3. HABTM form select drop down menu

问题描述

我有发票的形式。这是一个简化版本：所以它在其中选择一个下拉产品名称的菜单行项目。

I have an invoice form. This is a simplified version: so it has line items where you select a drop down menu of product names.

这是正常工作：所以发票LINE_ITEM关系是这样的：发票的has_many line_items和LINE_ITEM属于发票。 LINE_ITEM属于项目，项目的has_many line_items。我有项目，line_items和发票设置正确。

This is working well: So the invoice-line_item relations is this: invoice has_many line_items and line_item belongs to invoice. line_item belongs to item and item has_many line_items. I have the items, line_items and invoice setup correctly.

但现在我想税添加到行项目。

But now I want to add taxes to the line items.

所以，我创建了一个line_items_taxes表中创建line_items和税收之间的关系HABTM。但我不能在正确的形式对其进行设置。我的表看起来像这样...

So I created a line_items_taxes table to create a HABTM relationship between line_items and taxes. But I can't set it up correctly in the form. My form looks like this...

|name|price|tax|
|   v|     |  v|
|   v|     |  v|
|   v|     |  v|
[save invoice]

所以我需要一个税下拉选择菜单，并在发票保存，这样可以节省每个行项目的税款。

So I need a TAXES drop down select menu, and when the invoice is saved, it saves the tax for each line item.

我曾尝试在 http://snippets.dzone.com/posts/show提供的解决方案/ 4369 和 Rails的HABTM问题，但我得到的错误。

I have tried the solutions offered at http://snippets.dzone.com/posts/show/4369 and Rails HABTM Question but I get errors.

未定义的方法合并为：名称：符号
 ＆LT;％= f.collection_selectLINE_ITEM，tax_ids，@taxes，：ID，：姓名，{：名称=＆GT; LINE_ITEM [tax_ids] []'}％GT;

undefined method merge for :name:Symbol <%= f.collection_select "line_item", "tax_ids", @taxes, :id, :name, {:name => 'line_item[tax_ids][]'} %>

推荐答案

您到collection_select调用包含被扔东西了一个额外的参数。 （因为我假设你使用的是* *的form_for的'LINE_ITEM'参数自动包括在内，你是多余的。）

Your call to collection_select contains an extra parameter that is throwing things off. (Since I assume you are using *form_for*, the 'line_item' argument is automatically included, and yours is redundant.)

应该不是这个样子：

f.collection_select 'tax_ids', @taxes, :id, :name, {:name => 'line_item[tax_ids][]'}

这是朝着正确方向的开始，反正。

That's a start in the right direction, anyway.

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