Sometimes you may want to give the user the possibility to select a certain range of numbers in a numeric field in the admin generator. An example would be a rating between 1 and 5. This is where this snippet comes in handy.

Add the helper code below to one of your helper groups, that preferably is included in your standard_helpers. Then you can use it like in your generator.yml like follows:

generator: 
  ...
  param:
    ...
    edit:
      display: [..., percentage, ...]
      fields:
        ...
        percentage: { type: select_range_tag, params: min=0 max=100 step=5 }

Supplying a step is optional, it defaults to 1.

Helper code:

function select_range_tag($name, $selected, $options)
{
  $options = _parse_attributes($options);
 
  $select_options = range(_get_option($options, 'min', 1), _get_option($options, 'max', 5), _get_option($options, 'step', 1));
 
  return select_tag($name, options_for_select(array_combine($select_options, $select_options), $selected));
}
 
function object_select_range_tag($object, $method, $options = array(), $default_value = null)
{
  $options = _parse_attributes($options);
 
  $value = _get_object_value($object, $method, $default_value);
 
  return select_range_tag(_convert_method_to_name($method, $options), $value, $options);
}