Binding to extend PDF Printer

[jeff11]

Hi!

I would like to override TcpdfEntityPrinter class with a custom class. PrinterController is instantiating TcpdfEntityPrinter.

So I added:

custom/Espo/Modules/Course/Binding.php

namespace Espo\Modules\Course;

use Espo\Core\Binding\Binder;

use Espo\Tools\Pdf\Tcpdf\TcpdfEntityPrinter;
use Espo\Tools\Pdf\PrinterController;

class Binding
{
public function process(Binder $binder)
{
$binder
->for(PrinterController::class)
->bindImplementation(TcpdfEntityPrinter::class, CustomEntityPrinter::class);
}
} 

But my CustomEntityPrinter is not being used. Other bindings in this file are being used so it seems like I created the file correctly.

custom/Espo/Modules/Course/CustomEntityPrinter.php

namespace Espo\Modules\Course;

​class CustomEntityPrinter implements EntityPrinter
{​
....
} 

What am I doing wrong?

[jeff11]

I figured it out!

There is no need to do anything in Binding.php

Adding an entry to Espo/Custom/Resources/metadata/app/pdfEngines.json like this will call your custom class:

{
"Tcpdf": {
"implementationClassNameMap": {
"entity": "Espo\\Modules\\MyModule\\CustomTcpdfEntityPrinter"
}
}
}
​

I understand now:
If you want to override a class that is being instantiated by $this->injectableFactory->create($className); you need to use metadata like above.
If you want to override a class that is used in constructor like here https://docs.espocrm.com/development...entity-manager you need to use Binding.php