获取 MongoMapper 模型的键

发布于 2024-11-24 21:22:12 字数 159 浏览 1 评论 0原文

假设有以下模型：

class Article
  include MongoMapper::Document

  key :name, String
  key :body, String
end

我可以将模型的键放入数组或哈希中吗？

原文

Suppose the following model:

class Article
  include MongoMapper::Document

  key :name, String
  key :body, String
end

Could I get the keys of the model into an array or hash?

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雨落□心尘 2024-12-01 21:22:12

Article.keys 将为您提供关键对象的关键名称的哈希值。如果您只需要键名称，请尝试 Article.keys.keys。

ruby-1.9.2-p0 :011 > Article.keys
 => { 
  "_id"  => #<MongoMapper::Plugins::Keys::Key:0x000001041e5d48 @type=ObjectId, @name="_id", @options={}, @default_value=nil>,
  "name" => #<MongoMapper::Plugins::Keys::Key:0x00000104013100 @type=String, @name="name", @options={}, @default_value=nil>,
  "body" => #<MongoMapper::Plugins::Keys::Key:0x00000104011b20 @type=String, @name="body", @options={}, @default_value=nil>
}
ruby-1.9.2-p0 :012 > Article.keys.keys
 => ["_id", "name", "body"]

但请注意，如果您动态设置模型中未声明的任何键，或者加载具有模型中不存在的额外键的对象，它们将显示在键哈希中。请参阅https://github.com/jnunemaker/mongomapper/issues/195。

Article.keys will give you a hash of key names to key objects. If you just want the key names, try Article.keys.keys.

ruby-1.9.2-p0 :011 > Article.keys
 => { 
  "_id"  => #<MongoMapper::Plugins::Keys::Key:0x000001041e5d48 @type=ObjectId, @name="_id", @options={}, @default_value=nil>,
  "name" => #<MongoMapper::Plugins::Keys::Key:0x00000104013100 @type=String, @name="name", @options={}, @default_value=nil>,
  "body" => #<MongoMapper::Plugins::Keys::Key:0x00000104011b20 @type=String, @name="body", @options={}, @default_value=nil>
}
ruby-1.9.2-p0 :012 > Article.keys.keys
 => ["_id", "name", "body"]

Watch out though, if you dynamically set any keys that aren't declared in your model, or you load an object that has extra keys that aren't in your model, they will show up in the keys hash. See https://github.com/jnunemaker/mongomapper/issues/195.

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