Class: Class

Inherits:
Object
  • Object
show all
Defined in:
lib/enumerated_state.rb

Defined Under Namespace

Modules: EnumeratedStateClassMethods

Instance Method Summary collapse

Instance Method Details

#acts_as_enumerated_state(enum_attr, opts = {}) ⇒ Object Also known as: enumerated_state_pattern 



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# File 'lib/enumerated_state.rb', line 14

def acts_as_enumerated_state(enum_attr, opts={})
  enum_attr = enum_attr.to_sym
  unless (self.respond_to?(:has_enumerated_attribute?) && self.has_enumerated_attribute?(enum_attr))
    raise ArgumentError, "enumerated attribute :#{enum_attr} not defined"
  end

  if self.method_defined?("write_enumerated_attribute_without_#{enum_attr}")
    raise EnumeratedState::RedefinitionError, "Enumerated state already defined for :#{enum_attr}"
  end

  self.extend EnumeratedStateClassMethods # unless self.has_module?(EnumeratedStateClassMethods)
  self.set_enumerated_state_property(enum_attr, :module_prefix, opts[:module] ? "#{opts[:module]}::" : '')
  self.set_enumerated_state_property(enum_attr, :strict, opts[:strict] == false ? false : true)

  define_chained_method(:write_enumerated_attribute, enum_attr) do |attribute, value|
    without_method = "write_enumerated_attribute_without_#{enum_attr}".to_sym

    unless enum_attr == attribute.to_sym
      self.__send__(without_method, attribute, value)
    else
      old_value = self.read_enumerated_attribute(enum_attr)
      result = self.__send__(without_method, attribute, value)

      unless value == old_value
        unless old_value.nil?
          _module = self.class.get_module_for_enumerated_state(attribute, old_value)
          self.unmix(_module) if _module
        end
        unless value.nil?
          _module = self.class.get_module_for_enumerated_state(attribute, value)
          self.mixin(_module) if _module
        end
      end
      result
    end
  end
end