Rails 2.1

Update to Rails 2.1 final.

vendor/rails/activemodel/lib/active_model/validations/inclusion.rb

@@ -0,0 +1,37 @@
+module ActiveModel
+  module Validations
+    module ClassMethods
+      # Validates whether the value of the specified attribute is available in a particular enumerable object.
+      #
+      #   class Person < ActiveRecord::Base
+      #     validates_inclusion_of :gender, :in => %w( m f ), :message => "woah! what are you then!??!!"
+      #     validates_inclusion_of :age, :in => 0..99
+      #     validates_inclusion_of :format, :in => %w( jpg gif png ), :message => "extension %s is not included in the list"
+      #   end
+      #
+      # Configuration options:
+      # * <tt>:in</tt> - An enumerable object of available items
+      # * <tt>:message</tt> - Specifies a custom error message (default is: "is not included in the list")
+      # * <tt>:allow_nil</tt> - If set to +true+, skips this validation if the attribute is null (default is: +false+)
+      # * <tt>:allow_blank</tt> - If set to +true+, skips this validation if the attribute is blank (default is: +false+)
+      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
+      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
+      #   method, proc or string should return or evaluate to a true or false value.
+      def validates_inclusion_of(*attr_names)
+        configuration = { :message => ActiveRecord::Errors.default_error_messages[:inclusion], :on => :save }
+        configuration.update(attr_names.extract_options!)
+
+        enum = configuration[:in] || configuration[:within]
+
+        raise(ArgumentError, "An object with the method include? is required must be supplied as the :in option of the configuration hash") unless enum.respond_to?("include?")
+
+        validates_each(attr_names, configuration) do |record, attr_name, value|
+          record.errors.add(attr_name, configuration[:message] % value) unless enum.include?(value)
+        end
+      end
+    end
+  end
+end