berkmancenter/lumendatabase

module ValidatesAutomatically
  def self.included(model)
    model.instance_eval do
      to_validate = self.columns.select do |col|
        %i[string text].include?(col.type)
      end
      to_validate.each do |column_to_validate|
        validations = {}

        validations[:presence] = true if column_to_validate.null == false

        if column_to_validate.limit
          validations[:length] = { maximum: column_to_validate.limit }
        end

        if validations.present?
          validation_attributes = [column_to_validate.name, validations]
          model.send(:validates, *validation_attributes)
        end
      end
    end
  end
end