Mysql DataMapper NoMethodError：未定义的方法'encode_json'；日期时间

我不确定这是DataMapper问题还是Rails特有的问题：

NoMethodError:Sun的未定义方法“encode_json”，2010年11月28日00:00:00-0500:DateTime

我有一个定义如下的模型：

class Match
 include DataMapper::Resource

 storage_names[:default] = 'matches'
 property :id, Serial, :field => 'matches_id', :required => true

 def self.find_matches
   repository.adapter.select <<-SQL
     select
       m.matches_id,
       m.begin_date,
       m.windows_time_zone,
       team1_id,
       team2_id,
       t1.name as team1,
       t2.name as team2,
       m.status,
       COALESCE(md.name,'') as match_day_name,
       s.name as season_name,
       r.name as round_name,
       c.name as competition_name,
       COALESCE(g.name,'') as group_name,
       COALESCE(m.use_gsm,'N') as use_gsm,
       COALESCE(m.team1_finalscore,0) as team1_score,
       COALESCE(m.team2_finalscore,0) as team2_score
     from matches m
     inner join round r on (r.round_id = m.round_id)
     inner join season s on (s.season_id = r.season_id)
     inner join competition c on (c.competition_id =
s.competition_id)
     inner join team t1 on (t1.team_id = m.team1_id)
     inner join team t2 on (t2.team_id = m.team2_id)
     left outer join match_day md on (m.match_day_id =
md.match_day_id)
     left outer join groups g on (r.round_id = g.round_id)
     where m.begin_date <= (CURDATE() + interval 1 day)
     and m.begin_date >= (CURDATE() - interval 1 day)
     order by m.begin_date desc
   SQL
 end

end

当我尝试

Match.find_matches.to_json

时，

to_json

似乎被begin_日期格式阻塞了。我能做些什么来纠正这个问题吗？我使用的是MySQL 5.1 DATETIME，它通常显示为yyyy-mm-dd-hh:mm:ss（至少在MySQL客户机中是这样），因此某种格式化方式

---

encode_json无法消化。

这似乎是ActiveSupport:：json.encode中的一个错误。不支持结构类型。我开了一张罚单，提供了一个解决办法

“Match.find.matches.begin_date.class”报告是什么？它报告日期时间。我找到了我认为是根本原因的东西：ActiveSupport:JSON.encode不支持结构。我运行的是ruby 1.8.7，没有这个问题

Struct.new（：d）.new（DateTime.parse（Time.now.to_s（：db））[0].to_json

据我所知，这是一个ActiveSupport:json.encode问题，不是ruby问题。

#<struct matches_id=54235, begin_date=Sun, 28 Nov 2010 00:00:00 -0500,windows_time_zone="Morocco Standard Time", team1_id=937, team2_id=943,team1="Deportes Tolima", team2="La Equidad", status="N",match_day_name="Cuadrangular Semifinal Fecha 3",
season_name="Finalizacion 2010", round_name="Cuadrangular Semifinal",competition_name="Liga Postobon - Colombia", group_name="",use_gsm="N", team1_score=0, team2_score=0>