import os
  os.environ.setdefault("DJANGO_SETTINGS_MODULE", "test_settings")

  import django
  from django.conf import settings
  settings.configure(
      DATABASES={"default": {"ENGINE": "django.db.backends.sqlite3", "NAME": ":memory:"}},
      INSTALLED_APPS=["django.contrib.contenttypes"],
      DEFAULT_AUTO_FIELD="django.db.models.BigAutoField",
  )
  django.setup()

  from django.db import models, connection
  from ninja import Schema


  class Item(models.Model):
      name = models.CharField(max_length=100)
      class Meta:
          app_label = "test"

  with connection.schema_editor() as editor:
      editor.create_model(Item)


  class ItemSchema(Schema):
      name: str
      delete: str  # field name matches Item.delete() method


  item = Item.objects.create(name="Widget")
  print(f"Before serialization: {Item.objects.count()} item(s)")

  try:
      ItemSchema.from_orm(item)
  except Exception:
      pass

  print(f"After serialization:  {Item.objects.count()} item(s)")
  # Expected: 1 — serialization should be read-only
  # Actual:   0 — item was deleted by serialization

  Output:
  Before serialization: 1 item(s)
  After serialization:  0 item(s)