ROR的Heroku Postgres的問題

收到錯誤：ROR的Heroku Postgres的問題

ActiveRecord::StatementInvalid (PGError: ERROR: argument of HAVING must be type boolean, not type timestamp without time zone

控制器代碼片段：

def inactive 
    @number_days = params[:days].to_i || 90 
    @clients = Client.find(:all, 
     :include => :appointments, 
     :conditions => ["clients.user_id = ? AND appointments.start_time <= ?", current_user.id, @number_days.days.ago], 
     :group => 'client_id', 
     :having => 'MAX(appointments.start_time)' 
    ) 
    end

改變
:having => 'MAX(appointments.start_time)'
到
:having => ['MAX(appointments.start_time) <= ?', @number_days.days.ago]
現在的錯誤是：
ActiveRecord::StatementInvalid (PGError: ERROR: column "clients.id" must appear in the GROUP BY clause or be used in an aggregate function

來源

2010-04-24 sysconfig

我建議你刷上SQL的WHERE，HAVING和GROUP BY子句。 http://www.w3schools.com/sql/sql_having.asp。這不是一個Rails問題。 – JRL 2010-04-24 15:39:00

是啊，它肯定是一個postgres更嚴格，然後sqlite的東西，只是試圖找到一個解決方案....仍然學習 – sysconfig 2010-04-24 22:31:25

:having子句需要一個計算爲布爾值的SQL代碼段。 MAX(appointments.start_time)計算結果爲時間戳

來源

2010-04-24 04:42:31

變化：組=> 'CLIENT_ID' 到：組=> 'table_name.client_id'

來源

2010-04-25 21:28:19

ROR的Heroku Postgres的問題

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