Module: ModelX::Attributes::ClassMethods

Defined in:
lib/model_x/attributes.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#attributes ⇒ Array (readonly) 



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# File 'lib/model_x/attributes.rb', line 81

def attributes
  @attributes ||= []
end

Instance Method Details

#attribute(*attributes, options = {}) ⇒ Object

DSL method to define attributes.

Options Hash (options):

  • :default (Object) —

    A default value for the attribute.

  • :type (Symbol) —

    A type for the attribute.



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# File 'lib/model_x/attributes.rb', line 92

def attribute(*attributes)
  options = attributes.extract_options!

  @_model_x_defaults ||= {}
  @_model_x_types ||= {}

  attributes.each do |attribute|
    attribute = attribute.to_sym

    if instance_methods.include?(attribute)
      raise AttributeAlreadyDefined, "attribute :#{attribute} is already defined on #{self.name}"
    end
    self.attributes << attribute

    @_model_x_defaults[attribute] = options[:default] if options.key?(:default)
    @_model_x_types[attribute] = options[:type]

    class_eval <<-RUBY, __FILE__, __LINE__+1

      def #{attribute}
        value = read_attribute(:#{attribute})
        value = self.class.send(:_model_x_default, :#{attribute}) if value.nil?
        value
      end

      def #{attribute}=(value)
        write_attribute :#{attribute}, value
      end

    RUBY

    if options[:type]
      class_eval <<-RUBY, __FILE__, __LINE__+1
        #{options[:type]} :#{attribute}
      RUBY
    end

  end
end