validation

[Mike]

Validation

Seems like a lot of talk recently about validation:
http://www.snook.ca/archives/php/cakephp_data_va_1/
http://groups.google.com/group/cake-php/browse_thread/thread/985aa4578f79828e/f98b966dffb76a0e
http://groups.google.com/group/cake-php/browse_thread/thread/bec26338072a9e9b/7a47a67e615563ba
http://groups.google.com/group/cake-php/browse_thread/thread/6cedea09efb607fc/4996370ee1598ce9

Like Kabuto in the last thread, "I tried asking in IRC, but nobody
there was able to help
me".  I also had very little joy on IRC.
The Cake developers may be getting sick of these questions, but people
new to Cake may find it confusing.
Anyway, here's how I have implemented validation for 1.1.4.3104

To solve "Strange beforeValidate() behaviour"
https://trac.cakephp.org/ticket/932
copy /cake/app_model.php and put it in the /app/ directory.
Add this method to app/app_model.php


        function invalidFields($data = array()) {
                if(!isset($this->data) || empty($this->data)){ //I've added this
                        $this->data = $data;                        //I've 
added this
                }                                              //I've added this

                if (!$this->beforeValidate()) {
                        return false;
                }

                if (!isset($this->validate)) {
                        return true;
                }

                if (!empty($data)) {
                        $data = $data;
                } elseif (isset($this->data)) {
                        $data = $this->data;
                }

                if (isset($data[$this->name])) {
                        $data = $data[$this->name];
                }

                foreach($this->validate as $field_name => $validator) {
                        if (isset($data[$field_name]) && !preg_match($validator,
$data[$field_name])) {
                                $this->invalidate($field_name);
                        }
                }
                return $this->validationErrors;
        }


/******   controller    ******/

        function whatevers()
    {
                        if ($this->Whatever->validates($this->data))
            {
                                // save
                                $this->Whatever->save($this->data);
            } else {
                                // validation errors
                                $this->validateErrors($this->Whatever);
                                // used by tagSelect() method in view.  
$selected parameter shows
selected option
                                $this->set('selected_size',
$this->params['data']['Whatever']['size_id']);
                                $this->set('selected_brand',
$this->params['data']['Whatever']['brand_id']);
                                $this->render();
                        }
    }


/******   model   *******/

class Whatever extends AppModel
{
    var $name = 'Whatever';
        var $validate = array(
                'size_id'=>'/[1-9]/',
                'brand_id'=>'/[1-9]/')
        ;


        function beforeValidate()
        {

                // code for date validation goes here...
                // I use PEAR Date, which I haven't shown here...


                // to invalidate fields:
                $this->invalidate('start_date');  // to enable html helper to 
add
class="form_error" to the input tag (in the view)
                $this->invalidate('finish_date'); // to enable html helper to 
add
class="form_error" to the input tag (in the view)

                $this->invalidate('start_date_blank'); // enables tagErrorMsg() 
to
show the error in the view
                $this->invalidate('finish_date_blank'); // enables 
tagErrorMsg() to
show the error in the view
                $this->invalidate('date_range_negative'); // enables 
tagErrorMsg() to
show the error in the view


                return true;
        }

}

/******  view   *******/

<form id="quote" method="post" action="/whatever">
        <fieldset>
          <legend>Whatever</legend>

          <label for="start_date">Start Date</label>
         <p><?php echo $html->input('Whatever/start_date')?><br
/>day/month/year</p>
        <?php echo $html->tagErrorMsg('Quote/start_date_blank', 'Start date is
required.'); ?>
          <label for="finish_date">Finish Date</label>
          <p><?php echo $html->input('Whatever/finish_date')?><br
/>day/month/year</p>
        <?php echo $html->tagErrorMsg('Quote/finish_date_blank', 'Finish date
is required.'); ?>
        <?php echo $html->tagErrorMsg('Quote/date_range_negative', 'Finish
date must be later than the start date.'); ?>
        <p><?php        echo
$html->selectTag('Whatever/size_id',$size_select,$selected_size,NULL,NULL,false,true)
;?></p>
        <p><?php        echo
$html->selectTag('Whatever/brand_id',$brand_select,$selected_brand,NULL,NULL,false,true)
;       ?></p>
        <p><input type="submit" value="Show" /></p>
        </fieldset>
</form>


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