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2329394
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23
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2010-02-24T20:48:40.130
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2016-07-11T21:34:25.660
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2017-05-23T12:02:39.190
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163203
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2328984
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2
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324
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0
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text
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<p>There are several approaches :</p> <h1>Using ActiveSupport::Concern (Preferred)</h1> <p>Read the <a href="http://api.rubyonrails.org/classes/ActiveSupport/Concern.html" rel="noreferrer">ActiveSupport::Concern</a> documentation for more details.</p> <p>Create a file called <code>active_record_extension.rb</code> in the <code>lib</code> directory.</p> <pre><code>module ActiveRecordExtension extend ActiveSupport::Concern # add your instance methods here def foo "foo" end # add your static(class) methods here class_methods do #E.g: Order.top_ten def top_ten limit(10) end end end # include the extension ActiveRecord::Base.send(:include, ActiveRecordExtension) </code></pre> <p>Create a file in the <code>config/initializers</code> directory called <code>extensions.rb</code> and add the following line to the file:</p> <pre><code>require "active_record_extension" </code></pre> <h1>Inheritance (Preferred)</h1> <p>Refer to Toby's <a href="https://stackoverflow.com/questions/2328984/rails-extending-activerecordbase/2330533#2330533">answer</a>.</p> <h1>Monkey patching (Should be avoided)</h1> <p>Create a file in the <code>config/initializers</code> directory called <code>active_record_monkey_patch.rb</code>.</p> <pre><code>class ActiveRecord::Base #instance method, E.g: Order.new.foo def foo "foo" end #class method, E.g: Order.top_ten def self.top_ten limit(10) end end </code></pre> <p>The famous quote about Regular expressions by <a href="http://regex.info/blog/2006-09-15/247" rel="noreferrer">Jamie Zawinski</a> can be re-purposed to illustrate the problems associated with monkey-patching. </p> <blockquote> <p>Some people, when confronted with a problem, think “I know, I'll use monkey patching.” Now they have two problems.</p> </blockquote> <p>Monkey patching is easy and quick. But, the time and effort saved is always extracted back sometime in the future; with compound interest. These days I limit monkey patching to quickly prototype a solution in the rails console.</p>
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