Split up views into separate modules

todo/views/toggle_done.py

@@ -0,0 +1,37 @@
+from django.contrib import messages
+from django.contrib.auth.decorators import login_required
+from django.core.exceptions import PermissionDenied
+from django.http import HttpResponse
+from django.shortcuts import get_object_or_404, redirect
+from django.urls import reverse
+
+from todo.models import Task
+from todo.utils import toggle_task_completed
+
+
+@login_required
+def toggle_done(request, task_id: int) -> HttpResponse:
+    """Toggle the completed status of a task from done to undone, or vice versa.
+    Redirect to the list from which the task came.
+    """
+
+    task = get_object_or_404(Task, pk=task_id)
+
+    # Permissions
+    if not (
+        (request.user.is_superuser)
+        or (task.created_by == request.user)
+        or (task.assigned_to == request.user)
+        or (task.task_list.group in request.user.groups.all())
+    ):
+        raise PermissionDenied
+
+    toggle_task_completed(task.id)
+    messages.success(request, "Task status changed for '{}'".format(task.title))
+
+    return redirect(
+        reverse(
+            "todo:list_detail",
+            kwargs={"list_id": task.task_list.id, "list_slug": task.task_list.slug},
+        )
+    )