Rails：before_create 回调不适用于我的模型
我正在尝试在 Rails 3 模型中执行以下操作：
require 'securerandom'
class Contest < ActiveRecord::Base
attr_accessor :key
before_create :generate_key
private
def generate_key
self.key = SecureRandom.hex(3)
end
end
但是，当我创建竞赛时，表中的所有字段似乎都是正确的，除了数据库中保留为零的键之外。
更多信息：
在我的rails服务器日志中，当我通过“创建竞赛表单”创建竞赛时，我看到以下内容，
SQL (0.5ms) INSERT INTO "contests" ("category", "created_at", "description", "key", "price", "status", "time", "title", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) [["category", "camisas"], ["created_at", Wed, 15 Feb 2012 18:57:16 UTC +00:00], ["description", "test_description"], ["key", nil], ["price", 111], ["status", "In process"], ["time", "2sem"], ["title", "test_contest"], ["updated_at", Wed, 15 Feb 2012 18:57:16 UTC +00:00], ["user_id", 5]]
请注意[“key”，nil]
但这应该是正确的，对吗？，我会猜测密钥将由 Contest.rb :before_create 回调添加吗？
也许我错过了使用 SecureRandom？
I'm trying to do the following in my Rails 3 model:
require 'securerandom'
class Contest < ActiveRecord::Base
attr_accessor :key
before_create :generate_key
private
def generate_key
self.key = SecureRandom.hex(3)
end
end
However when I create a Contest, all the fields in my table appear to be correct except the key which remains nil in my DB.
More Info:
In my rails server log, I see the following when I create a contest through my "create contest form"
SQL (0.5ms) INSERT INTO "contests" ("category", "created_at", "description", "key", "price", "status", "time", "title", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) [["category", "camisas"], ["created_at", Wed, 15 Feb 2012 18:57:16 UTC +00:00], ["description", "test_description"], ["key", nil], ["price", 111], ["status", "In process"], ["time", "2sem"], ["title", "test_contest"], ["updated_at", Wed, 15 Feb 2012 18:57:16 UTC +00:00], ["user_id", 5]]
Note the ["key", nil]
But that should be correct right?, I would guess that the key will be added by the Contest.rb :before_create callback?
Maybe I'm miss-using SecureRandom?
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为什么使用
attr_accessor？该方法实际上将为键定义 setter 和 getter 方法，以跟踪虚拟属性。也许您打算使用
attr_accessible，但即便如此，这也是不必要的，因为您是直接设置属性。实际上，如果您只是像这样设置，那么您的模型中根本不需要
attr_accessor :key或attr_accessible :key。删除attr_accessor，它就可以工作了。Why are you using
attr_accessor? This method is actually going to be defining both a setter and getter method for a key, keeping track of a virtual attribute.Perhaps you meant to use
attr_accessible, but even then that is unnecessary, because you're setting the attribute directly.Really, you don't need either
attr_accessor :keyorattr_accessible :keyin your model at all if you're just setting it like this. Remove theattr_accessorand it will work.我认为你应该写
attr_accessible例如：attr_accessible ：键，：类别
I think you should write
attr_accessible <list accessible params>for example:attr_accessible :key, :category