Module: HasConstant::Orm::ActiveModel::ClassMethods

Defined in:
lib/has_constant/orm/active_model.rb

Instance Method Summary collapse

Instance Method Details

#has_constant(name, values = lambda { I18n.t(name) }, options = {}) ⇒ Object 



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# File 'lib/has_constant/orm/active_model.rb', line 7

def has_constant( name, values = lambda { I18n.t(name) }, options = {} )
  super(name, values, options)

  singular = (options[:accessor] || name.to_s.singularize).to_s

  # Add the getter method. This returns the string representation of
  # the stored value
  define_method(singular) do
    if read_attribute(singular)
      if values.is_a?(Array)
        self.class.send(name)[read_attribute(singular).to_i]
      elsif values.is_a?(Hash)
        HashWithIndifferentAccess.new(self.class.send(name))[read_attribute(singular)]
      end
    end
  end

  define_method("#{singular}=") do |val|
    if values.is_a?(Array) && val.instance_of?(String)
      write_attribute singular.to_sym, self.class.send(name.to_s).index(val)
    elsif values.is_a?(Hash) && values.has_value?(val)
      write_attribute singular.to_sym, values.invert[val].to_s
    else
      write_attribute singular.to_sym, val
    end
  end

  class_eval do
    if respond_to?(:scope)
      scope :by_constant, lambda { |constant,value| { :conditions =>
        { constant.to_sym =>
          eval("#{self.to_s}.#{constant.pluralize}.index(value)") } } }

      scope "#{singular}_is".to_sym, lambda { |*values| { :conditions =>
        { singular.to_sym => indexes_for(name, values) }
      } }

      scope "#{singular}_is_not".to_sym, lambda { |*values| {
        :conditions => ["#{singular} NOT IN (?)",
                        indexes_for(name, values)] } }
    else
      named_scope :by_constant, lambda { |constant,value| {
        :conditions =>
        { constant.to_sym =>
          eval("#{self.to_s}.#{constant.pluralize}.index(value)") } } }

      named_scope "#{singular}_is".to_sym, lambda { |*values| {
        :conditions => { singular.to_sym => indexes_for(name, values) }
      } }

      named_scope "#{singular}_is_not".to_sym, lambda { |*values| {
        :conditions => ["#{singular} NOT IN (?)",
                        indexes_for(name, values)] } }
    end
  end
end