fix: E301 swapped out error

test_settings.py

@@ -75,3 +75,5 @@ LOGGING = {
         "django.request": {"handlers": ["console"], "level": "DEBUG", "propagate": True},
     },
 }
+
+TODO_TASK_MODEL = "todo.Task"

todo/admin.py

@@ -1,6 +1,8 @@
 from django.contrib import admin
+import swapper
+from todo.models import Attachment, Comment, TaskList
 
-from todo.models import Attachment, Comment, Task, TaskList
+Task = swapper.load_model("todo", "Task")
 
 
 class TaskAdmin(admin.ModelAdmin):

todo/apps.py

@@ -0,0 +1,11 @@
+from django.apps import AppConfig
+
+
+class TodoConfig(AppConfig):
+    name = "todo"
+
+    def ready(self):
+        # Credit: https://stackoverflow.com/a/47154840/885053
+        from django.conf import settings
+        settings = settings._wrapped.__dict__
+        settings.setdefault("TODO_TASK_MODEL", "todo.Task")

todo/migrations/0011_swappable_task.py

@@ -73,4 +73,9 @@ class Migration(migrations.Migration):
                 to="todo.BaseTask",
             ),
         ),
+        migrations.AlterField(
+            model_name='basetask',
+            name='task_list',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to=settings.TODO_TASK_MODEL),
+        ),
     ]

todo/models.py

@@ -71,7 +71,7 @@ class TaskList(models.Model):
 
 class BaseTask(models.Model):
     title = models.CharField(max_length=140)
-    task_list = models.ForeignKey(TaskList, on_delete=models.CASCADE, null=True)
+    task_list = models.ForeignKey(settings.TODO_TASK_MODEL, on_delete=models.CASCADE, null=True)
     created_date = models.DateField(default=timezone.now, blank=True, null=True)
     due_date = models.DateField(blank=True, null=True)
     completed = models.BooleanField(default=False)
@@ -140,7 +140,7 @@ class Comment(models.Model):
     author = models.ForeignKey(
         settings.AUTH_USER_MODEL, on_delete=models.CASCADE, blank=True, null=True
     )
-    task = models.ForeignKey(Task, on_delete=models.CASCADE)
+    task = models.ForeignKey("Task", on_delete=models.CASCADE)
     date = models.DateTimeField(default=datetime.datetime.now)
     email_from = models.CharField(max_length=320, blank=True, null=True)
     email_message_id = models.CharField(max_length=255, blank=True, null=True)
@@ -174,7 +174,7 @@ class Attachment(models.Model):
     Defines a generic file attachment for use in M2M relation with Task.
     """
 
-    task = models.ForeignKey(Task, on_delete=models.CASCADE)
+    task = models.ForeignKey(settings.TODO_TASK_MODEL, on_delete=models.CASCADE)
     added_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
     timestamp = models.DateTimeField(default=datetime.datetime.now)
     file = models.FileField(upload_to=get_attachment_upload_dir, max_length=255)