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    <p>Without having looked much at your code, here's my take on implementing validation class methods:</p> <pre><code>module Validations def self.included(base) base.extend ClassMethods end def validate errors.clear self.class.validations.each {|validation| validation.call(self) } end def valid? validate errors.blank? end def errors @errors ||= {} end module ClassMethods def validations @validations ||= [] end def validates_presence_of(*attributes) validates_attributes(*attributes) do |instance, attribute, value, options| instance.errors[attribute] = "cant't be blank" if value.blank? end end def validates_format_of(*attributes) validates_attributes(*attributes) do |instance, attribute, value, options| instance.errors[attribute] = "is invalid" unless value =~ options[:with] end end def validates_attributes(*attributes, &amp;proc) options = attributes.extract_options! validations &lt;&lt; Proc.new { |instance| attributes.each {|attribute| proc.call(instance, attribute, instance.__send__(attribute), options) } } end end end </code></pre> <p>It assumes that ActiveSupport is around, which it is in a Rails environment. You might want to extend it to allow multiple errors per attribute, with <code>instance.errors[attribute] &lt;&lt; "the message"</code>, but I left out obscurities like that in order to keep this short sample as simple as possible.</p> <p>Here's a short usage example:</p> <pre><code>class MyClass include Validations attr_accessor :foo validates_presence_of :foo validates_format_of :foo, :with =&gt; /^[a-z]+$/ end a = MyClass.new puts a.valid? # =&gt; false a.foo = "letters" puts a.valid? # =&gt; true a.foo = "Oh crap$(!)*#" puts a.valid? # =&gt; false </code></pre>
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    1. POHow to create activerecord style validations outside of activerecord?
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    1. USAugust Lilleaas
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    1. COThanks for the answer that is what I am looking for thanks. One question, what does it require ActiveSupport? thanks.
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      1. USJosh Moore
    2. COIt uses `Hash#blank?` (in the `valid?` method). But that's about it, heh. Shouldn't be too hard to drop active_support. I just assumed it was already there, because you're in the rails context anyways.
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      1. USAugust Lilleaas
    3. COIt also uses Array#extract_options!, but that's simple enough to duplicate/extract.
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      1. USRobert K
 

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