Load Template from App

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from os.path import dirname, join, abspath, isdir
 
from django.template.loader import BaseLoader
from django.db.models import get_app
from django.core.exceptions import ImproperlyConfigured
from django.template import TemplateDoesNotExist
from django.conf import settings
from django.utils._os import safe_join
 
class Loader(BaseLoader):
    is_usable = True
 
    def get_template_sources(self, template_name, template_dirs=None):
        app_name, template_name = template_name.split(":", 1)
        try:
            template_dir = abspath(safe_join(dirname(get_app(app_name).__file__), 'templates'))
        except ImproperlyConfigured:
            raise TemplateDoesNotExist()
        
        return template_name, template_dir
     
    def load_template_source(self, template_name, template_dirs=None):
        """ 
        Template loader that only serves templates from specific app's template directory.
     
        Works for template_names in format app_label:some/template/name.html
        """
        if ":" not in template_name:
            raise TemplateDoesNotExist()
     
        template_name, template_dir = self.get_template_sources(template_name)
     
        if not isdir(template_dir):
            raise TemplateDoesNotExist()
        
        filepath = safe_join(template_dir, template_name)
        with open(filepath, 'rb') as fp:
            return (fp.read().decode(settings.FILE_CHARSET), filepath)

     
    load_template_source.is_usable = True

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