使用MongoMapper继承：搜索父类
当使用 mongomapper/rails 继承时，将类名保存在字段中是否有意义？
class Item
include MongoMapper::Document
timestamps!
key :class, String # does this actually make sense?
key :title, String
end
class Post < Item
key :body1, String
end
class Page < Item
key :body2, String
end
如果执行对 Item 的搜索，MongoMapper 将返回 Item 对象。 目前还不清楚它们是什么类型的物体。如果我们想显示一个 图标或类似的东西来区分各个项目， 可以通过将类名保存在数据库中来完成。这有道理吗 或者有更好的方法吗？
does it make sense to save the class name in a field when using inheritance with mongomapper/rails?
class Item
include MongoMapper::Document
timestamps!
key :class, String # does this actually make sense?
key :title, String
end
class Post < Item
key :body1, String
end
class Page < Item
key :body2, String
end
if a search for Item is performed, MongoMapper would return Item Objects.
it is not clear, which kind of objects they are. if we want to display an
icon or something similar to distinguish the items from each other,
it could be done by saving the class name in the db. does this make sense,
or is there a better way?
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你可能想看看这个stackoverflow线程： MongoMapper Parent Inheritance
实际上你使用“_type”作为键名，mongomapper 会自动将类名添加到条目中：
you might want to take a look at this stackoverflow thread: MongoMapper Parent Inheritance
actually you use "_type" as the key name, mongomapper automatically adds the class name to the entry: