Django: Lazy view

lazy_view.py

from typing import Callable

from django.utils.module_loading import import_string
from django.views import View


class LazyView:
    """
    Wrapper for view class that can be used for urls to avoid loading the view class at the import time.
    The view is imported at first access and cached.
    To use in urls.py, just instantiate `LazyView` with class path argument and use as a normal view:
    ```python
    url(r'^/view$', LazyView('path.to.ViewClass').as_view(), name="url-name"),
    ```
    """
    def __init__(self, view_cls_path: str) -> None:
        super().__init__()
        self.view_cls_path = view_cls_path

    def view_func(self, *args, **kwargs):
        if not hasattr(self, 'view'):
            view_cls: type[View] = import_string(self.view_cls_path)
            self.view: Callable = view_cls.as_view(**self.initkwargs)
        return self.view(*args, **kwargs)

    def as_view(self, **initkwargs):
        self.initkwargs = initkwargs
        return self.view_func

To use in urls.py, just instantiate `LazyView` with class path argument and use as a normal view:

url(r'^/view$', LazyView('path.to.ViewClass').as_view(), name="url-name"),