Saving field value

[majkiris]

Hi everyone!
I need some help with a module that saves sum of integer fields as a hidden field value.
There are 3 integer fields in template: rating1, rating2, rating3 and one hidden field: total.
Can't figure out, how to save the field value to DB...
I tried use $field->set and $fields->save, but all what i get is Call to a member function save() on a non-object error.

<?php
class TotalRating extends WireData implements Module {

    /**
     * @return array
     */
    public static function getModuleInfo() {

        return array(
            'title' => 'Total rating',
            'version' => 100,
            'summary' => '',
            'singular' => true,
            'autoload' => true,
            );
    }

    public function init() {
        $this->pages->addHookAfter('save', $this, 'total');
    }

    public function total($event) {
        $page = $event->arguments[0];
        if ($page->template == "cat") {
            $rat1 = $page->rating1;
            $rat2 = $page->rating2;
            $rat3 = $page->rating3;
            $ratTotal = $rat1 + $rat2 + $rat3;

            //save $ratTotal as "total" field value
        }        
    }    
}

[Ivan Gretsky]

Welcome to the friendly forums of ProcessWire dear Majkiris!

Check this out. It will probably help with you in your quest.

[adrian]

I think what you are looking for is:

$page->save("total");

If you did just $page->save() you'd end up in a loop because your hook would get called again each time it saves itself.

EDIT: Oh and in case you haven't figured it out, you need to set the field value first:

$page->total = $ratTotal;

[majkiris]

Thank you adrian! Of course it works. I swear to my life that i did tried that..but it didn't work (maybe i used $page->save($total)).
 

Welcome to the friendly forums of ProcessWire dear Majkiris!
Check this out. It will probably help with you in your quest.

Thank you for the link Ivan. I will dive into it later.

[Ivan Gretsky]

My bad. I thought it is out of scope error (which probably happened when majkris was performing $fields->save if I got it right).

I am glad Adrian helped us here. But I want to take something out of this for myself too .

As I understand,

$page = $event->arguments[0];

sets $page variable in the scope of the class method. But I do not know what is $event and its arguments. Where do they come from? I would be happy to get an explanation or a link to documentation article/forum post.

[adrian]

$fields->save() would save details about that field - various settings etc, rather than the contents of the field on that particular page.

$event is coming from the event that is hooked, so in this case, @majkiris is hooking page save, so by getting the first argument from the save event, he is getting the page object. You could also do:

$page = $event->argumentsByName("page");

The first argument, eg arguments[0] won't always be the page object, it depends on the hook. Sometimes, for example, it might be the width of an image.

Hope that helps a little.

[Ivan Gretsky]

I'll dive into it ))