Problem using form validation with custom form fields

woom · July 2012

I'm using a custom form field (there is no field for it in the modules database table).
In the modules form_fields() function I use the following code to generate my form field:

$fields['csv_import'] = array(
			'type' => 'file',
			'overwrite' => false,
			'accept' => 'csv|txt|xls',
			'order' => 1000,
			'label' => 'CSV Import',
			'upload_path' => TRAVEL_PORTAL_PATH.'assets/data/',
			'overwrite' => TRUE	//TODO: Check if file already exists
			//'filename' => */
		);

That works perfectly fine.
I can access the uploaded file from the form in my on_after_post() function.

Now I'd like to add some validation to my field, so I changed my on_before validate($values) function like this (just for testing -> the validation rule array('no test', 'test') always returns false, so an error message should appear.)

function on_before_validate($values)
	{
		$saved_data = $this->normalized_save_data;
		$this->add_validation('csv_import', 'is_equal_to', 'Yehaaa!', array('no test', 'test'));
	        return $values;
	}

The Code above doesn't work. I don't get a validation error message.

if I change my code to

function on_before_validate($values)
	{
		$saved_data = $this->normalized_save_data;
		$this->add_validation('title', 'is_equal_to', 'Yehaaa!', array('no test', 'test'));
	        return $values;
	}

where 'title' is a normal form input field (the module generates out of my database table), everything works fine. -> I get a validation error.

How can I add validation rules to custom form fields?

Thanks for your help and the great CMS/Framework.

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Problem using form validation with custom form fields