PG：：语法错误： 错误： 语法错误 "AS" 错误轨道 4.1 处或附近

Question

我刚刚将rails升级到4.1，并收到以下错误：

PG::SyntaxError: ERROR:  syntax error at or near "AS"
LINE 1: SELECT COUNT(count_column) FROM (SELECT  * AS count_column F...
                                               ^
: SELECT COUNT(count_column) FROM (SELECT  * AS count_column FROM (SELECT thread_id,     max(id) as id FROM "messages"  WHERE 1=0 AND (thread_id IS NOT NULL) GROUP BY thread_id) last JOIN messages ON messages.id = last.id LIMIT 5 OFFSET 0) subquery_for_count

方法如下：

- as_myself do
    %li#messages-open.icon-btn.email
      - message_count = inbox_messages.count.is_a?(Hash) ? inbox_messages.count.values.first : inbox_messages.count
      - if(message_count.present? && message_count > 0)
        %span= message_count

Answer 1

rails 4.1中的新语法是count(:all)解决了我的问题。