1
我试图用新的DataMapper模型映射旧版MySQL数据库。DataMapper枚举字段在保存或更新时不会保留
的MySQL架构:
CREATE TABLE IF NOT EXISTS `backer` (
`backer_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`secret` varchar(16) NOT NULL,
`email` varchar(255) DEFAULT NULL,
`status` enum('pending','ready') NOT NULL DEFAULT 'pending', # relevant bit
PRIMARY KEY (`backer_id`),
UNIQUE KEY `backer_id` (`secret`),
KEY `email` (`email`,`status`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=8166 ;
DataMapper的模式:
class Backer
include DataMapper::Resource
storage_names[:default] = "backer"
property :id, Serial, :field => "backer_id"
property :secret, String, :field => "secret"
property :email, String, :field => "email"
property :status, Enum[ :pending, :ready ], :field => "status", :default => "pending"
has n, :items, :child_key => "backer_id"
end
DataMapper.finalize
对于大多数属性,我能坚持:
b = Backer.first
b.first_name = "Daniel"
b.save!
# Backer.first.first_name == "Daniel"
它依旧很好。 但是,当我与enum
做到这一点:
b = Backer.first
b.status = :pending
b.save!
# b.status == :pending
# Backer.first.status != :pending
# Backer.first.update!(:status => :pending) ...
更新/保存到一个enum
场似乎并没有坚持它。
SQL看起来通常喜欢:
1.9.3p327 :019 > Backer.last.update(:status => :ready)
~ (0.000349) SELECT `backer_id`, `secret`, `email`, `status` FROM `backer` ORDER BY `backer_id` DESC LIMIT 1
~ (0.000190) UPDATE `backer` SET `status` = 2 WHERE `backer_id` = 8166
=> true
但是,当我观看对象(例如Backer.last
)然后status
不被改变。
UPDATE
我已经验证,在MySQL数据库中列举status
领域正在被持续。但是,DataMapper类中枚举的status
属性根本不反映(始终为nil
)。
这里发生了什么?
'b.reload'ing帮助吗? – morbusg
啊,不用等待,DataMapper的'Enum'持续为'Integer',而MySQL' enum'则是一个字符串。所以你很可能需要修补'DataMapper :: Property :: Enum'来支持MySQL'enum'。 – morbusg