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Like CI Form Validation is there any easy way to have multiple (Groups) validation in DataMapper Model Extension? - Printable Version

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Like CI Form Validation is there any easy way to have multiple (Groups) validation in DataMapper Model Extension? - El Forum - 03-10-2009

[eluser]dmyers[/eluser]
I have really been digging into datamapper and was wondering if like CodeIgniter's Form Validation which has validation "groups" is there an easy way to have "groups" on a datamapper model?

http://ellislab.com/codeigniter/user-guide/libraries/form_validation.html

For example on 1 form I have every field BUT email (or whatever) if I try to validate the form (via the datamodel) it fails because I haven't set the "email" field.

Perhaps a "not check" value of some kind???

What I ended up doing is this in which I change the validation via a function call. Any body else have any ideas?


Code:
$user = new User();

$user->firstname_validation();
        
$user->first = $_POST['edffirst'];
$user->last = $_POST['edflast'];

$user->validate();


Code:
class User extends DataMapper {

        var $table = 'users';

        function _username_check($field,$param=null) {
            /**
            Custom Error msg in datamapper_lang.php file
            $lang['username_check']    = '%s user name check failed';
            */
            
            return false;
        }

        function default_validation() {
            $this->validation = array(
            array(
                'field' => 'first',
                'label' => 'First Name',
                'rules' => array('required','alpha_numeric')
            ),
            array(
                'field' => 'last',
                'label' => 'Last Name',
                'rules' => array('required','alpha_numeric')
            ),
            array(
                'field' => 'email',
                'label' => 'Email',
                'rules' => array('required', 'username_check', 'trim', 'valid_email')
            )
        );
        }        

        function firstname_validation() {
            $this->validation = array(
            array(
                'field' => 'first',
                'label' => 'First Name',
                'rules' => array('required','alpha_numeric')
            ),
            array(
                'field' => 'last',
                'label' => 'Last Name',
                'rules' => array('required','alpha_numeric')
            ),
        );
        }        


        function __construct() {
        parent::DataMapper();
        
        $this->default_validation();
    }
}


Like CI Form Validation is there any easy way to have multiple (Groups) validation in DataMapper Model Extension? - El Forum - 03-10-2009

[eluser]dmyers[/eluser]
Ok, this is what I came up with I think it's the easiest.

Adding this

Code:
function only_validate($inp=null) {
        $remove_set = array_diff(array_keys($this->validation),explode(',',$inp));
    
        foreach ($remove_set as $field)
            $this->validation[$field] = array('field'=>'','label'=>'','rules'=>array());        
    }

to your class and/or datamapper you can use it like this.

Code:
$u->only_validate('first');
$u->only_validate('email,first');

Unit Test against each

Code:
$u = new user();

$u->only_validate('first');
$u->only_validate('email,first');

$u->validate();
        
echo $u->error->string;

Then you can leave you validation in place and turn off what you need depending on the form requirements.

What do you think?

Like CI Form Validation is there any easy way to have multiple (Groups) validation in DataMapper Model Extension? - El Forum - 03-22-2009

[eluser]OverZealous[/eluser]
Sorry this is so much later, but I just read your post and wanted to make a suggestion:

When saving an existing object, you should load that object in, first. This allows DM to determine which fields have changed, and only update those fields.
Code:
$u = new User();
$u->get_by_id($input->form->post['user_id']);
// set data
$u->save();
// etc.

If it is a new object, every required field should be filled out (I mean, it's required, right?).

If the field is sometimes required, and sometimes not, I have a simple trick that works really well. I add a _required method to the model, which I can then always return TRUE on. This prevents errors for empty fields. Then I have a custom validation routine that determines if that field is necessary or not:
Code:
$validation = array(
    array(
        'field' => 'first',
        'rules' => array('required', 'check_names')
    ), // etc
);

// down in the validation routines

function _required($field) {
    if(in_array($field, array('first', 'last')) {
        return TRUE;
    } else {
        return !empty($this->{$field});
    }
}

function check_names($field) {
    // require either first OR last
    return empty($this->first) && empty($this->last);
}

You will need to have a language key called "check_names" with a message like:
"You must include either a first name or a last name."