Fixed #35384 -- Raised FieldError when saving a file without a name to FileField.

django/db/models/fields/files.py

@@ -3,7 +3,8 @@ import posixpath
 
 from django import forms
 from django.core import checks
-from django.core.files.base import File
+from django.core.exceptions import FieldError
+from django.core.files.base import ContentFile, File
 from django.core.files.images import ImageFile
 from django.core.files.storage import Storage, default_storage
 from django.core.files.utils import validate_file_name
@@ -12,6 +13,7 @@ from django.db.models.fields import Field
 from django.db.models.query_utils import DeferredAttribute
 from django.db.models.utils import AltersData
 from django.utils.translation import gettext_lazy as _
+from django.utils.version import PY311
 
 
 class FieldFile(File, AltersData):
@@ -312,6 +314,15 @@ class FileField(Field):
 
     def pre_save(self, model_instance, add):
         file = super().pre_save(model_instance, add)
+        if file.name is None and file._file is not None:
+            exc = FieldError(
+                f"File for {self.name} must have "
+                "the name attribute specified to be saved."
+            )
+            if PY311 and isinstance(file._file, ContentFile):
+                exc.add_note("Pass a 'name' argument to ContentFile.")
+            raise exc
+
         if file and not file._committed:
             # Commit the file to storage prior to saving the model
             file.save(file.name, file.file, save=False)