转换SQL查询到Rails的Active Record查询接口

Question

我有以下SQL查询，我想把它映射到一个轨道数查询：

SELECT count(*), DATE(CONVERT_TZ(created_at, '+00:00', '-05:00')) as converted_date 
FROM video_logs 
where user_id = 19 and question_id = 96 and dashboard = 'player_question' 
GROUP BY converted_date; 

我该怎么办呢？

Answer 1

在Rails 3：

VideoLog.select("count(*), DATE(CONVERT_TZ(created_at, '+00:00', '-05:00')) as converted_date").\ 
    where(:user_id => 19, :question_id => 96, :dashboard => 'player_question').\ 
    group('converted_date') 

在轨道2：

VideoLog.all(:select => "count(*), DATE(CONVERT_TZ(created_at, '+00:00', '-05:00')) as converted_date", 
    :conditions => {:user_id => 19, :question_id => 96, :dashboard => 'player_question'}, 
    :group => 'converted_date')