Using the FatFree Template->render on a string instead of a file

[Bradley Slavik]

I see how to use a file for sending email from your examples:

mail(
   $f3->get('to'),
   $f3->get('subject'),
   Template::instance()->render('email.txt','text/html')
);


We are storing our emails as text fields in a database table.
I load body of email into string and expand macros embedded in it.

How do I get this Template object to "render" my string, which is
not in a file?

How do I do something like this:

$body = '<p>This is for {{ @userName }}</p><p>The end</p>';

echo Template::instance()->render($body,'text/html');

Of course, we cannot use the render function just like this, because it is

supposed to take a file name, but I hope there is a way to use the power of

fatfree to render a string instead of a file.

Bradley Slavik

[bcosca]

Not possible to render templates on the fly without any intervening file I/O due to the fact that templates are compiled/cached prior to output.

[ikkez]

I tried it once by myself to modify the template class to force it eating my template string, but it's indeed not possible that easy and could have a lot side effects.
But i tested another solution / work-a-round for you.

Put your string into a virtual file, which the template class can work with. To achieve that you need my little File Abstraction Layer Plugin

This is a little example how to do it:

$f3->route('GET /template-from-string', function($f3){
   
    $f3->set('userName', 'John');

    $body = '<p>This is for {{ @userName }}</p><p>The end</p>';

    /** @var FAL $fal */
    $fal = FAL::instance();
    $fal->load('template.html');
    $fal->setContent($body);
    $fileStream = $fal->getFileStream(); // fal://template.html
    // file_exists($fileStream); is now TRUE

    // workaround templates "file must be in UI dir" limitation
    $f3->set('UI',$f3->get('UI').'| ');
    // render file
    echo \Template::instance()->render($fileStream);
});

Notice: this solution is experimental.

[Bradley Slavik]

I don't mind if it is cached, as long as it creates a unique name since there may be more than one process running at once sending email. As long as FatFree does not get confused and read the wrong file into the wrong session everything is fine. So is ikkez solution what you would recommend?

[Nanawel]

I'm also interested in such a feature. My situation is that I have templates located not on the filesystem but in the database (because basically they're CMS and so they can be edited by backend users).

Still no good solution for this case?

[ved]

Maybe this:

- write the template from the database to a temporary file

- change the UI variable to the folder where the temp file was created

- call Template::render on the temp file

Not tested but I guess it should work, although not ideal. 

[Nanawel]

Yes sure that would work, but it's a pity to need to write a file just to process a template. My goal here is to avoid unnecessary I/O.

Thanks anyway.

[ikkez]

there is a solution nowadays.

$content = $template->resolve( $template->parse( $template ) );

(should work on 3.6+, is bugged in 3.6.1, but already fixed in 3.6.2-dev)

[ved]

Cool, I actually didn't know about that. Thumbs up @ikkez :)

[Nanawel]

Ohh... How did I miss that? That's perfect :D

Thanks Ikkez!

[Nuwanda]

I've looked on the View and Templates page and on the Templates API page, and there's no mention of resolve.

Where is the doc for this?

[ikkez]

resolve is inherited from the Preview class... sure not the best way to display the docs but the class hierachy is View->Preview->Template
https://fatfreeframework.com/3.6/preview#resolve

[Ross Elliot]

Thanks.

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