Custom Validation Rule in Model

I was hoping to use the validation functionality in the model itself instead of the Controller. I have written some validation rules for controller but want to write and use some for use in the model along with those built-in validations (E.g., required|in_list etc).

https://codeigniter.com/user_guide/model...ating-data

How do I add a method from my library to the beforeInsert/udpate/delete events?

https://codeigniter.com/user_guide/model...del-events

Hi,
Thanks for the links...
So I have this code in my model for validation:

PHP Code:

protected $validationRules = [
 'day_walked' => 'trim|required|is_unique[walking_stats.day_walked]',
'cal_burned' => 'trim|required|decimal|greater_than[0]',
'miles_walked' => 'trim|required|decimal|greater_than[0]',
'duration' => 'trim|required|exact_length[8]|durationFormat(duration)|durationFormatValues(duration)|durationZeroError(duration)',
'mph' => 'trim|required|decimal|greater_than[0]',
  ]; 


Say for the

PHP Code:

durationFormat(duration) 


rule, if I have that function called out in the public $ruleSets array in the Config/Validation.php file which is written in my app/Validation/WalkValidationRules.php file, can I access that function and other's in in my model?