Add TemplateView.as_view(template_name) option

Author: davegaeddert

plain/plain/views/templates.py

@@ -27,6 +27,10 @@ class TemplateView(View):
 
     template_name: str | None = None
 
+    def __init__(self, template_name=None):
+        # Allow template_name to be passed in as_view()
+        self.template_name = template_name or self.template_name
+
     def get_template_context(self) -> dict:
         return {
             "request": self.request,