紅寶石尋找到之前的updated_at

Question

我試圖搜索結果，其中一個結果的updated_at是在別人的創建後，這是我的代碼在一個簡短而親切的版本

我得到一個語法錯誤

PG::SyntaxError: ERROR: syntax error at or near "13" 
LINE 1: ...ERE ((group_id = 14 and created_at >= 2016-08-04 13:39:35 U... 
                  ^
: SELECT "chats".* FROM "chats" WHERE ((group_id = 14 and created_at >= 2016-08-04 13:39:35 UTC)) ORDER BY created_at DESC 

，但我不明白爲什麼它事做的時候？

@grouparchived = @groupread.updated_at 

filter1 = "(group_id = "+@arandomthing.to_s + " and created_at >= "+@grouparchived.to_s+")" 

@chats1 = Chat.where(@filter1).order('created_at DESC') 

Answer 1

Chat.where(group_id: @arandomthing).where('created_at >= ?', @groupread.updated_at).order('created_at DESC') 

喜歡你做Concating字符串是一個災難，更好地使用這些工具的Rails的給你。