[SOLVED] Missing addFilter() function in slim/twig-view/src/Twig.php?

1

Should the Twig.php class from slim/twig-view not contain a

addFilter()

method? I found this post [Slim\Views] how to addFilter() for twig? but the Slim Twig class does not seem to contain an addFunction() method, so I’m a bit confused at this point.

Thanks for any insights.

2

it has. it even has the addFunction()

3

I’m sorry, either I’m being stupid or blind (I take this as a sign that it’s really time for me to go to bed).

My slim/twig-view/src/Twig.php does not contain an addFilter() or addFunction() method. The only method it contains matching “add*” is addExtension().

My composer.lock tells me that I have

"version": "1.2.0"

installed which (I just checked) is more than a year old. I’ll update tomorrow morning; my guess is this will fix things.

Lesson learned: don’t blindly copy/paste composer.json entries. :slight_smile:

4

I just updated and I checked the Twig.php class, and for the life of me, I can’t find an addFunction() method. I’m still getting

Call to undefined method Slim\Views\Twig::addFunction()

Composer.lock now tells me that I have version 2.1.1 installed. OK, I’m going to bed (almost 4AM here), maybe a fresh brain tomorrow will help me figure out what’s going on.

5

OK, the after some sleep, the now rested brain is still lost over the issue (starting to feel stupid here). To witness:

root@RNG-Linux:/var/www/html/BCM# cd vendor/slim/twig-view/src
root@RNG-Linux:/var/www/html/BCM/vendor/slim/twig-view/src# ls -l
 -rw-r--r-- 1 www-data www-data 1482 Mär 13  2016 TwigExtension.php
 -rw-r--r-- 1 www-data www-data 5971 Mär 13  2016 Twig.php
root@RNG-Linux:/var/www/html/BCM/vendor/slim/twig-view/src# grep addExtension *
Twig.php:    public function addExtension(\Twig_ExtensionInterface $extension)
Twig.php:        $this->environment->addExtension($extension);
root@RNG-Linux:/var/www/html/BCM/vendor/slim/twig-view/src# grep addFunction *
root@RNG-Linux:/var/www/html/BCM/vendor/slim/twig-view/src# grep addFilter *
root@RNG-Linux:/var/www/html/BCM/vendor/slim/twig-view/src#

So I’m not seeing an addFunction() method anywhere.

From composer.lock:

{
        "name": "slim/twig-view",
        "version": "2.1.1",

This could just be a case of me having stared at this for too long; the solution is probably clear but it’s eluding me. Any hints are highly appreciated.

6

Hi @TheLobos, I’m far from an expert in this topic so take this with a few grains of salt. I don’t think all of Twig’s methods are directly exposed through slim/twig-view. Some of them you need to reach in and grab from Twig itself rather than through Slim’s bridge.

$view->getEnvironment->addFilter($yourTwigFilter);

In that example, $view (slim/twig-view) is getting the Twig Environment (/vendors/twig/twig/lib/Twig/Environment.php) which is where the addFilter() and addFunction() methods live.

But I could be totally misguided here.

7

Thanks for your suggestion @tflight, it got me 1 big step further. My mistake was (derived from my understanding and from others’ comments) that slim/twig-view exposed this function.

You are correct that it does not that that you have to use

 $view->getEnvironment->addFilter($yourTwigFilter);

to add a filter. This now works but for some reason the filter I’m using is not being referenced correctly by Twig. Here’s what I’ve got:

class RealtyNumberFormat extends \Twig_SimpleFilter
{
    public function getName()
    {
       return 'realtyNumberFormat';
    }

    public function getFilters()
    {
        return [
             new \Twig_SimpleFilter('realtyNumberFormat', array($this, 'realtyNumberFormat')),
             new \Twig_SimpleFilter('realtyNumberFormatShort', array($this, 'realtyNumberFormatShort')),
             new \Twig_SimpleFilter('realtyNumberFormatPercentage', array($this, 'realtyNumberFormatPercentage'))
         ];
   }

   public function realtyNumberFormat ($string)
   {
       return RealtyManagerUtil::numberFormat($string);
   }

   public function realtyNumberFormatShort ($string)
   {
       return RealtyManagerUtil::numberFormatShort($string);
   }

   public function realtyNumberFormatPercentage ($string)
   {
       return RealtyManagerUtil::numberFormatPercentage($string);
   }
}

The in the Twig init code I do:

$view->getEnvironment()->addFilter(new RealtyNumberFormat('RealtyManager', RealtyNumberFormat::class));

I find the parameters to addFilter() a bit weird but I’ve tried a number of other stuff, and this one is the only one which Twig doesn’t complain about.

Then in my template I do:

{{ someValue|realtyNumberFormat }}

or

{{ someValue|realtyNumberFormat() }}

Both of these return the same error:

Call to undefined function RealtyManager\Twig\Filter\RealtyNumberFormat()

Not that it complains about the class name rather than the ‘realtyNumberFormat’ method.

Does anybody know what I’m doing wrong?

8

After lots of putzing around, I finally figured it out:

  1. Extend your filter from Twig_Extension and NOT from Twig_SimpleFilter

  2. Use addExtension() to add your filter to your Twig instance.

Totally simple; as usual the stupid problems take the longest to solve.