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Does any one know how Drupal 8 picks up theme template file? I mean in source code.

I have module which use a custom template file for a custom block , but the custom template file was not been picked up.

I have tried many different ways, but none working, so I have decided to looking Drupal 8 source code to find out , but I am unable to find out exact source code that picks up the theme template file.

  • Have you added a theme hook? – Eyal Jan 19 '16 at 6:18
  • Please check the values on render array that you return from your hook_theme, make sure the twig file is inside the /templates directory of you r module, and flush cache. – DropDragon Jan 19 '16 at 6:28
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I had a similar problem and tried:

{% include 'my-template.html.twig' %}
{% include directory ~ '/templates/my-template.html.twig' %}

but ThemeRegistryLoader wouldn't recognize 'my-template'. This syntax worked:

{% include 'modules/custom/my_module/templates/my-template.html.twig' %}
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Ok, I have just uninstall / re install the module, now it worked. Drupal 8, probably keep some old information somewhere in cache.

By the way, during debuging, I have found this interesting class:

Drupal\Core\Template\Loader\ThemeRegistryLoader

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