JSON 和 XML 中的附加属性
我目前正在尝试将属性合并到我的 Rails 应用程序的 API 中。用例很简单。我有一个用户模型：
class User < ActiveRecord::Base
attr_accessible :email
end
我有另一个模型，基本上将用户链接到事件：
class UserEvent < ActiveRecord::Base
belongs_to :user
belongs_to :event
end
我希望能够通过可作为 JSON 或 XML 访问的 API 使用 UserEvent 模型列出与事件相关的所有用户，并且我希望我的 UserEvent 的电子邮件出现在 XML 和 JSON 转储中。
这个问题表明我可以覆盖serialiable_hash，好吧，这似乎只适用于 JSON，因为 to_xml 似乎没有使用 serialized_hash
我研究的另一种方法是覆盖我的类中的 attribute 方法：
class UserEvent < ActiveRecord::Base
def attributes
@attributes = @attributes.merge "email" => self.email
@attributes
end
end
这适用于 JSON，但在尝试时会抛出错误XML 版本：
undefined method `xmlschema' for "2011-07-12 07:20:50.834587":String
该字符串是我的对象的“created_at”属性。所以看起来我在我在这里操作的哈希上做了一些错误的事情。
I am currently trying to incorporate attributes in the API of my Rails app. The use case is simple. I have a User model:
class User < ActiveRecord::Base
attr_accessible :email
end
I have another model, basically linking the users to an Event:
class UserEvent < ActiveRecord::Base
belongs_to :user
belongs_to :event
end
I want to be able to list all users related to an event using the UserEvent model through an API accessible as JSON or XML, and I would like the email of my UserEvent to appear in both XML and JSON dump.
This question suggests that I can just override serialiable_hash, well this appears to work only for JSON, as it looks like serializable_hash is not used by to_xml
Another approach I have investigated was to override the attributes method in my class:
class UserEvent < ActiveRecord::Base
def attributes
@attributes = @attributes.merge "email" => self.email
@attributes
end
end
This works well for JSON, but throws an error when trying the XML version:
undefined method `xmlschema' for "2011-07-12 07:20:50.834587":String
This string turns out to be the "created_at" attribute of my object. So it looks like I am doing something wrong on the hash I am manipulating here.
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您可以使用
include轻松将其他嵌套数据添加到 API 响应中。下面是一个示例：respond_with(@user, :include => :user_event )您还应该在
User中添加反向关联：has_many :user_events对于多个模型，您可以将数组传递给
:include。它将序列化它们并将它们适当地嵌套在响应中。You can easily add additional nested data into API responses using
include. Here's an example:respond_with(@user, :include => :user_event )You should also add the reverse association in
User:has_many :user_eventsYou can pass in an array to
:includefor multiple models. It'll serialize and nest them in the response appropriately.