blocks|key|3004940|text|将近一年了，现在我可以回顾一下，我发现学习rails的最好资源是http://guides.rubyonrails.org/的Rails指南。它们很好地将所有东西连接在一起，提供了一些示例，并给出了API文档的入口点(而不是像我刚开始时那样随意地乱摆)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3004941|entityMap|0|LINK|mutability|MUTABLE|url|http://guides.rubyonrails.org/^0|W|U|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

It's been almost a year, and I can now look back and say that the best resources I found for learning rails are the Rails Guides at <a href="http://guides.rubyonrails.org/" rel="nofollow">http://guides.rubyonrails.org/</a>. They tie everything together very nicely, provide some examples, and give me an entry point into the API documentation (as opposed to flailing around randomly like I did when I first started).

blocks|key|886005|text|我每天都在使用http://railsapi.com/，我希望你也能发现它的帮助！|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|886006|entityMap|0|LINK|mutability|MUTABLE|url|http://railsapi.com/^0|7|K|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I use <a href="http://railsapi.com/" rel="nofollow">http://railsapi.com/</a> on a daily basis, I hope you find it helpful as well!

blocks|key|886069|text|权威网站-+http://api.rubyonrails.org|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|886070|entityMap|0|LINK|mutability|MUTABLE|url|http://api.rubyonrails.org/^0|6|Q|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

the authoritative site too - <a href="http://api.rubyonrails.org" rel="nofollow">http://api.rubyonrails.org</a>

blocks|key|864433|text|Rails+ActiveRecord确实支持列和方法的模型内省，只需使用以下方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|864434|$+rails+console
1.9.3>+Product.columns
1.9.3>+=>+[#<ActiveRecord::ConnectionAdapters::PostgreSQLColumn:0x007fe853d2c1f0+@name="id",+@sql_type="integer",+@null=false,+...

1.9.3>+Product.methods
1.9.3>+=>+[:_validators,+:before_add_for_memberships?,+:before_add_for_memberships=,+:before_add_for_memberships,+:after_add_for_memberships?,+...|code-block|syntax|javascript|864435|理论上，这将允许您发现可能感兴趣的方法(或列)，然后可以使用其他答案中引用的API文档源。|864436|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Rails ActiveRecord does support model introspection of columns and methods, just use the following

<pre><code>$ rails console
1.9.3&gt; Product.columns
1.9.3&gt; =&gt; [#&lt;ActiveRecord::ConnectionAdapters::PostgreSQLColumn:0x007fe853d2c1f0 @name="id", @sql_type="integer", @null=false, ...

1.9.3&gt; Product.methods
1.9.3&gt; =&gt; [:_validators, :before_add_for_memberships?, :before_add_for_memberships=, :before_add_for_memberships, :after_add_for_memberships?, ...
</code></pre>

That would theoretically allow you to discover likely methods (or columns) which may be of interest and then you can use the API doc sources referenced in other answers.

I am new to Rails, and I am finding it extremely opaque. I have a copy of the latest Agile Web Development with Rails, but my worry is that without this book I would be completely lost.

For example, following the depot example in the book, when it comes to adding validation to the model, you do

<pre><code>class Product &lt; ActiveRecord::Base

 validates :title, :description, :image_url, :presence =&gt; true

end
</code></pre>

Seems easy enough, except that without the AWDwR book I would never have figured this out. There is nothing in the ActiveRecord::Base documentation that mentions the validates method.

It seems to me that with Rails you are just supposed to mysteriously know what methods are available at any given point in a project. But if you don't know, how are you supposed to find out (apart from memorizing a 500+ page book)?

I can phrase the question another way: In my Product class, I have available to me a method named validates. How is this method made available to my Products class? Even knowing that it is defined in ActiveModel::Validations::ClassMethods (I know this because I looked it up) I cannot figure out how it has been made available to my Product class.

How do I discover available methods in Rails documentation?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我对Rails很陌生，而且我发现它非常不透明。我有一本最新的带有Rails的敏捷Web开发，但我担心如果没有这本书，我会完全迷失方向。例如，按照书中的仓库示例，在向模型添加验证时，您可以这样做。class Product < ActiveRecord::Base validates :title, :description, :image_url, :presence => trueend似乎很

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