blocks|key|1475309|text|some_instance.attributes|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1475310|来源：blog|unstyled|offset|length|1475311|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.codefront.net/2008/02/13/living-on-the-edge-of-rails-7-improved-activerecordbaseattributes-time-zone-support/^0|0|3|4|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>some_instance.attributes
</code></pre>

Source: <a href="http://blog.codefront.net/2008/02/13/living-on-the-edge-of-rails-7-improved-activerecordbaseattributes-time-zone-support/" rel="noreferrer">blog</a>

blocks|key|1260752|text|有一个叫做Annotate+models的rails插件，它将在你的模型文件的顶部生成你的模型属性，这里是链接：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1260753|https://github.com/ctran/annotate_models|offset|length|1260754|为了使注解保持同步，您可以编写一个任务来在每次部署后重新生成注解模型。|1260755|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|14|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

There is a rails plugin called Annotate models, that will generate your model attributes on the top of your model files
here is the link:

<a href="https://github.com/ctran/annotate_models" rel="noreferrer">https://github.com/ctran/annotate_models</a>

to keep the annotation in sync, you can write a task to re-generate annotate models after each deploy.

blocks|key|1475411|text|有关Schema的内容|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1475412|Model.column_names+++++++++
Model.columns_hash+++++++++
Model.columns+|code-block|syntax|javascript|1475413|例如AR对象中的实例变量/属性|1475414|object.attribute_names++++++++++++++++++++
object.attribute_present?++++++++++
object.attributes|1475415|例如，没有从超类继承的方法|1475416|Model.instance_methods(false)|1475417|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

For Schema related stuff

<pre><code>Model.column_names 
Model.columns_hash 
Model.columns 
</code></pre>

For instance variables/attributes in an AR object

<pre><code>object.attribute_names 
object.attribute_present? 
object.attributes
</code></pre>

For instance methods without inheritance from super class

<pre><code>Model.instance_methods(false)
</code></pre>

blocks|key|1475475|text|如果您只对数据库中的属性和数据类型感兴趣，那么可以使用Model.inspect。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1475476|irb(main):001:0>+User.inspect
=>+"User(id:+integer,+email:+string,+encrypted_password:+string,
+reset_password_token:+string,+reset_password_sent_at:+datetime,
+remember_created_at:+datetime,+sign_in_count:+integer,
+current_sign_in_at:+datetime,+last_sign_in_at:+datetime,
+current_sign_in_ip:+string,+last_sign_in_ip:+string,+created_at:+datetime,
+updated_at:+datetime)"|code-block|syntax|javascript|1475477|或者，在为您的开发环境运行rake+db:create和rake+db:migrate之后，文件db/schema.rb将包含您的数据库结构的权威来源：|1475478|ActiveRecord::Schema.define(version:+20130712162401)+do
++create_table+"users",+force:+true+do+%7Ct%7C
++++t.string+++"email",++++++++++++++++++default:+"",+null:+false
++++t.string+++"encrypted_password",+++++default:+"",+null:+false
++++t.string+++"reset_password_token"
++++t.datetime+"reset_password_sent_at"
++++t.datetime+"remember_created_at"
++++t.integer++"sign_in_count",++++++++++default:+0
++++t.datetime+"current_sign_in_at"
++++t.datetime+"last_sign_in_at"
++++t.string+++"current_sign_in_ip"
++++t.string+++"last_sign_in_ip"
++++t.datetime+"created_at"
++++t.datetime+"updated_at"
++end
end|1475479|entityMap^0|R|D|0|0|D|E|S|F|1C|C|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

If you're just interested in the properties and data types from the database, you can use <code>Model.inspect</code>.

<pre><code>irb(main):001:0&gt; User.inspect
=&gt; "User(id: integer, email: string, encrypted_password: string,
 reset_password_token: string, reset_password_sent_at: datetime,
 remember_created_at: datetime, sign_in_count: integer,
 current_sign_in_at: datetime, last_sign_in_at: datetime,
 current_sign_in_ip: string, last_sign_in_ip: string, created_at: datetime,
 updated_at: datetime)"
</code></pre>

Alternatively, having run <code>rake db:create</code> and <code>rake db:migrate</code> for your development environment, the file <code>db/schema.rb</code> will contain the authoritative source for your database structure:

<pre><code>ActiveRecord::Schema.define(version: 20130712162401) do
 create_table "users", force: true do |t|
 t.string "email", default: "", null: false
 t.string "encrypted_password", default: "", null: false
 t.string "reset_password_token"
 t.datetime "reset_password_sent_at"
 t.datetime "remember_created_at"
 t.integer "sign_in_count", default: 0
 t.datetime "current_sign_in_at"
 t.datetime "last_sign_in_at"
 t.string "current_sign_in_ip"
 t.string "last_sign_in_ip"
 t.datetime "created_at"
 t.datetime "updated_at"
 end
end
</code></pre>

blocks|key|1475528|text|为了描述模型，我使用了以下代码片段|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1475529|Model.columns.collect+{+%7Cc%7C+"#{c.name}+(#{c.type})"+}|code-block|syntax|javascript|1475530|同样，这是如果你看起来很漂亮的印刷体来描述你的ActiveRecord，而不是在你足够友好地在属性中发表评论之前去迁移或者跳过那个开发人员。|offset|length|style|CODE|1475531|entityMap^0|0|0|N|C|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

To describe model I use following snippet

<pre><code>Model.columns.collect { |c| "#{c.name} (#{c.type})" }
</code></pre>

Again this is if you are looking pretty print to describe you <code>ActiveRecord</code> without you going trough migrations or hopping that developer before you was nice enough to comment in attributes.

I am finding it difficult to easily see what attributes/properties exist on all of my model classes since they are not explicitly defined in my class files.

To discover model attributes, I keep the schema.rb file open and flip between it and whatever code I'm writing as needed. This works but is clunky because I have to switch between reading the schema file to pick up attributes, the model class file to check methods, and whatever new code that I'm writing to call attributes &amp; methods. 

My question is, how do you discover model attributes when you're analyzing a Rails codebase for the first time? Do you keep the schema.rb file open all the time, or is there a better way that doesn't involve jumping between schema file &amp; model file constantly?

How do you discover model attributes in Rails?

数据库

我发现很难很容易地看到我的所有模型类上都存在哪些属性/属性，因为它们没有在我的类文件中显式定义。为了发现模型属性，我让schema.rb文件保持打开状态，并根据需要在它和我正在编写的任何代码之间切换。这是可行的，但很笨拙，因为我必须在读取模式文件以获取属性、模型类文件以检查方法以及我正在编写的用于调用属性和方法的任何新...

问如何在Rails中发现模型属性？
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