Can I format my validation strings with relevant info in Kohana 3?

Question

I've noticed in Kohana 3 these error messages provided by default.

return array(
    'not_empty' => ':field must not be empty.',
);

Obviously, :field is replaced with the field name.

Now I am validating an image upload. Obviously, I'm allowing only JPG, JPEG, GIF & PNG.

I have an error message set up like so.

return array(
    'photo' => array(
        'Upload::type' => 'You must upload an image file (JPG, JPEG, GIF, PNG)'
    )
);

I also use Kohana's validation helper like so.

$input->rules('photo', array(
'Upload::type' => array('Upload::type' => array('jpg', 'jpeg', 'png', 'gif'))
));

Is there a way I can use those accepted extensions in my error string, perhaps like...

return array(
    'photo' => array(
        'Upload::type' => 'You can only upload files of :types'
    )
);

Answer 1

you can access the parameters with :param1 :param2 etc

'error' => 'You can only upload files of :param1, :param2, :param3'

I guess this doesn't work so well with variable amounts of parameters =(

A possible solution would be to use a callback as an alias to the rule, then take the list of allowed formats and send them to the message manually using implode().

ex:

public function valid_type(Validate $array, $field, $formats)
{
    $params = $formats;
    array_unshift($params, $array[$field]);
    if ( ! call_user_func_array(array('Upload', 'type'), $params))
    {
        $array->error($field, 'Upload::type', array('types' => $formats));
    }
}

Answer 2

Kohana has this feature "out of the box" :)

So, you should add something like this:

// messages/validate.php
return array(
   'upload::type' => ':field should be one of the following types: [:param1]', 
);