如何按多關係表的字段進行排序？

Question

我需要根據料品的訂單關係字段（payment_method_meta_type.name）生成需要按欄定購的收據清單。

型號：

Receipt 
Deposit 
PaymentMethodMetaType 

存款型號：

class Deposit < ActiveRecord::Base 

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

我在控制了收益的數組已：

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

在視圖我可以顯示payment_method_meta_type。名稱以及

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

但是，當我創建收據數組的集合時，如何在控制器中按照receipts.deposit.payment_method_meta_type.name的順序顯示列表？

Answer 1

THX，我終於工作了，使用 '包括' 在查詢字符串

@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) 

Answer 2

試試這個：

@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)