Module: Perfectline::Validations::ValidatesExistence::ClassMethods

Defined in:
lib/validates_existence.rb

Instance Method Summary collapse

Instance Method Details

#validates_existence_of(*attr_names) ⇒ Object 



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# File 'lib/validates_existence.rb', line 11

def validates_existence_of(*attr_names)
  configuration = {:message => "does not exist", :on => :save}
  configuration.update(attr_names.extract_options!.symbolize_keys)

  send(validation_method(configuration[:on] || :save), configuration) do |record|

    attr_names.each do |attr|
      attribute = attr.to_s.sub(/_id$/, '').to_sym
      association = reflect_on_association(attribute)

      if association.nil? || association.macro != :belongs_to
        raise ArgumentError, "Can not validate existence on #{attribute}, not a belongs_to association."
      end

      value = record.__send__(association.primary_key_name)
      next if value.nil? && configuration[:allow_nil]

      if association.options.has_key?(:foreign_type)
        foreign_type = record.__send__(association.options[:foreign_type])
        
        if not foreign_type.blank?
          association_class = foreign_type.constantize
        else
          record.errors.add(attr, configuration[:message]) and next
        end
      else
        association_class = association.klass
      end

      record.errors.add(attr, :existence, :default => configuration[:message]) unless association_class.exists?(value)
    end
  end
end