rails 3 activerecord - for：連接錯誤的sql生成

Question

我有以下2個類。

class Customer < ActiveRecord::Base 
set_table_name "customer" 
set_primary_key "customerId" 
has_many :new_orders, :foreign_key => "customerid", :primary_key => "customerId", :class_name => "NewOrder" 
end 

class NewOrder < ActiveRecord::Base 
set_table_name "viewNewOrders" 
set_primary_key "orderid" 
belongs_to :customer, :foreign_key => "customerid", :primary_key => "customerId" 
end 

我無法觸摸數據庫來更改任何表，視圖或列名稱。

這完美的作品：

new_orders_last_2_weeks = 
NewOrder.where("orderdate >= :start and orderdate < :end", 
{:start => period_start, :end => period_end}) 

然而這樣的：

new_orders_last_2_weeks = 
NewOrder.joins(:customer).where("orderdate >= :start and orderdate < :end", 
{:start => period_start, :end => period_end}) 

產生這種錯誤的SQL：

SELECT  `viewNewOrders`.* FROM  `viewNewOrders` INNER JOIN `customer` ON `customer`.`customerId` IS NULL WHERE  (orderdate >= '2010-09-02' and orderdate < '2010-09-16') 

我怎樣才能得到它來生成內加入適當的條件？

謝謝。

Answer 1

問題在於ActiveRecord對錶和字段名稱是區分大小寫的。

因此更改

set_table_name "viewNewOrders" 

到

set_table_name "viewneworders" 

解決的問題。