如何将数组传递给Rails中的fields_for？ [英] How do I pass an array to fields_for in Rails?

问题描述

我想在关联中的记录子集上使用 fields_for 。

我有一个 Month 模型，其中 has_many：payments 。

但是在我的在我看来，我只想要 fields_for 这些付款中的一部分。例如：

   -  fields_for @ month.payments.large 
  

这是行不通的。

我可以将一组记录传递给 fields_for ，而不是通常的符号（ fields_for：payments ）的方法？

解决方案

您可以为大额付款添加其他关联，例如：

  class Month< ActiveRecord :: Base 
 has_many：payments 
 has_many：large_payments，：class_name => 付款，：条件=> value> 1000000
 end 
  

之后，您可以使用 fields_for 常见方式：

   -  fields_for：large_payments 
  
 
 
 
我认为将这种逻辑封装在模型一侧是一种更好的方法，然后在视图中。
 
I want to use fields_for on a subset of records in an association.

I have a Month model, which has_many :payments.

But in my form in my view I only want to have fields_for some of those payments. For example:
- fields_for @month.payments.large
This doesn't work.

Can I pass a set of records to fields_for, rather than the usual symbol (fields_for :payments) approach?
解决方案
You can add additional association for large payments, for example:
class Month < ActiveRecord::Base
  has_many :payments
  has_many :large_payments, :class_name => "Payment", :conditions => "value > 1000000"
end
After that you can use fields_for in common way:
- fields_for :large_payments
I think to encapsulate this logic on a model side is a better approach then in the view.

                        
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