def content_columns
      model.content_columns.select do |column|
        !Formtastic::FormBuilder.skipped_columns.include? column.name.to_sym
      end
    end
def content_columns
      model.content_columns.select do |column|
        !Formtastic::FormBuilder.skipped_columns.include? column.name.to_sym
      end
    end
Collects content columns (non-relation columns) for the current class.
 Skips Active Record Timestamps.