Refactored Mongoid::Enum::ClassMethods for readability

lib/mongoid/enum.rb

@@ -5,30 +5,53 @@ module Mongoid
   module Enum
     extend ActiveSupport::Concern
     module ClassMethods
+
       def enum(name, values, options = {})
         field_name = :"_#{name}"
-        const_name = name.to_s.upcase
+        options = default_options(values).merge(options)
-        multiple = options[:multiple] || false
-        default = options[:default].nil? && values.first || options[:default]
-        required = options[:required].nil? || options[:required]
-        validate = options[:validate].nil? || options[:validate]
 
-        const_set const_name, values
+        set_values_constant name, values
 
-        type = multiple && Array || Symbol
+        create_field field_name, options
-        field field_name, :type => type, :default => default
         alias_attribute name, field_name
 
-        if multiple && validate
+        create_validations field_name, values, options
-          validates field_name, :'mongoid/enum/validators/multiple' => { :in => values, :allow_nil => !required }
+        define_value_scopes_and_accessors field_name, values, options
-        elsif validate
-          validates field_name, :inclusion => {:in => values}, :allow_nil => !required
       end
 
+      private
+      def default_options(values)
+        {
+          :multiple => false,
+          :default  => values.first,
+          :required => true,
+          :validate => true
+        }
+      end
+
+      def set_values_constant(name, values)
+        const_name = name.to_s.upcase
+        const_set const_name, values
+      end
+
+      def create_field(field_name, options)
+        type = options[:multiple] && Array || Symbol
+        field field_name, :type => type, :default => options[:default]
+      end
+
+      def create_validations(field_name, values, options)
+        if options[:multiple] && options[:validate]
+          validates field_name, :'mongoid/enum/validators/multiple' => { :in => values, :allow_nil => !options[:required] }
+        elsif validate
+          validates field_name, :inclusion => {:in => values}, :allow_nil => !options[:required]
+        end
+      end
+
+      def define_value_scopes_and_accessors(field_name, values, options)
         values.each do |value|
           scope value, where(field_name => value)
 
-          if multiple
+          if options[:multiple]
             class_eval "def #{value}?() self.#{field_name}.include?(:#{value}) end"
             class_eval "def #{value}!() update_attributes! :#{field_name} => (self.#{field_name} || []) + [:#{value}] end"
           else