ChoiceWidget.option_template_name ignores TEMPLATES DIRS

[Maksim Iakovlev]

Django can only find template if it located in app dir (if path relative to BASE_DIR is myapp/templates/myapp/mytemplate.html), but raises TemplateDoesNotExist if template located in custom dir specified in TEMPLATES DIRS (if path relative to BASE_DIR is templates/myapp/mytemplate.html).

class MyWidget(ChoiceWidget):
    option_template_name = 'myapp/mytemplate.html'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [
            os.path.join(BASE_DIR, 'templates'),
        ],
        'APP_DIRS': True,
...

[Tim Graham]

My guess is that you aren't using FORM_RENDERER = 'django.forms.renderers.TemplatesSetting' in your settings. Read about ​form rendering.

If you believe that Django is at fault, please give a pointer to the faulty code.

[Maksim Iakovlev]

You right, I didn't know that default renderer "... loads templates first from the built-in form templates directory in django/forms/templates and then from the installed apps’ templates directories using the app_directories loader" and doesn't use TEMPLATES setting. Thank you for the answer.