Rails的語法錯誤

Question

哪裏錯誤在此，我不能看到它：

news = News.find(:all, :conditions => [":simulation_id => session[:sim_id] AND :created_at > session[:last_login]"]) 

Answer 1

試試這個：

news = News.find(:all, :conditions => ["simulation_id = ? AND created_at > ?", session[:sim_id], session[:last_login]]) 

Answer 2

你的條件字符串不會被評估爲你想到：

[":simulation_id => session[:sim_id] AND :created_at > session[:last_login]"] 

變化，要

["simulation_id = ? AND created_at > ?", session[:sim_id], session[:last_login]] 

Answer 3

您也可以撥打Model.all代替Model.find(:all)這將是這個樣子：

news = News.all(:conditions => ["simulation_id = ? AND created_at > ?", session[:sim_id], session[:last_login]])