Question

我需要在rails中生成一个收据列表，需要按商品的订单关系字段（payment_method_meta_type.name）排序。

模特：

Receipt
Deposit
PaymentMethodMetaType

存款模式：

class Deposit < ActiveRecord::Base

  belongs_to :payment_method_meta_type
  has_many   :receipts, :class_name=>"Receipt", :foreign_key=>"deposit_id", 
                    :dependent => :destroy
end

我已经在控制器中收到了一个收据数组：

@receipts = Receipt.find(:all, :conditions => ["date BETWEEN ? AND ?", 
  @start_date, @end_date], :order => "date DESC, id DESC", 
  :limit => limit, :offset => offset)

在视图中，我也可以显示payment_method_meta_type.name

- @receipts.each do |o|
  %tr.
    .....
    %td #{o.receipt_number}
    %td #{o.deposit.payment_method_meta_type.name}
    .....

但是，当我创建收据数组的集合时，如何在控制器中按receipts.deposit.payment_method_meta_type.name的顺序显示列表？

Answer 1

试试这个：

@receipts = Receipt.all(:joins => {:deposit => :payment_method_meta_type},
              :conditions => {:date => @start_date..@end_date}, 
              :order => "payment_method_meta_types.name ASC", 
              :limit => limit, :offset => offset)

Answer 2

thx，我终于解决了，在查询字符串中使用'include'

@receipts = Receipt.find(:all, :include => {:deposit => [:payment_method_meta_type] } ,:conditions => ["Receipts.business_date BETWEEN ? AND ?", @current_month_start_date, @current_month_end_date],:order => "tag_types.name , Receipts.business_date DESC",:limit => limit)

如何按多关系表的字段排序？

2 个答案: