module FieldsValidator extend ActiveSupport::Concern included do validate :validate_column_names if respond_to?(:validate) end class_methods do def validate_required_attributes if required_attributes and required_attributes.any? required_attributes.each do |a| validates a.to_sym, presence: true end end end def required_attributes (defined?(super) and super.is_a?(Array)) ? super : [] end def required_database_fields (defined?(super) and super.is_a?(Array)) ? super : [] end end private def validate_column_names if self.class.required_database_fields and self.class.required_database_fields.any? self.class.required_database_fields.each { |rdf| errors.add(rdf, "does not have a column in the database.") unless self.class.column_names.include?(rdf.to_s)} if self.class.required_database_fields.any? end end end