Fixed #8918 -- Made FileField.upload_to optional.

                if decimalp_ok and mdigits_ok:

                    if decimal_places > max_digits:

                        e.add(opts, invalid_values_msg % f.name)

            if isinstance(f, models.FileField) and not f.upload_to:

                e.add(opts, '"%s": FileFields require an "upload_to" attribute.' % f.name)

            if isinstance(f, models.ImageField):

                try:

                    from django.utils.image import Image

   account.

#. Add the :class:`~django.db.models.FileField` or

   :class:`~django.db.models.ImageField` to your model, making sure to

   define the :attr:`~django.db.models.FileField.upload_to` option to tell

   Django to which subdirectory of :setting:`MEDIA_ROOT` it should upload

   files.

   :class:`~django.db.models.ImageField` to your model, defining the

   :attr:`~django.db.models.FileField.upload_to` option to specify a

   subdirectory of :setting:`MEDIA_ROOT` to use for uploaded files.

#. All that will be stored in your database is a path to the file

   (relative to :setting:`MEDIA_ROOT`). You'll most likely want to use the

``FileField``

-------------

.. class:: FileField(upload_to=None, [max_length=100, **options])

.. class:: FileField([upload_to=None, max_length=100, **options])

A file-upload field.

    The ``primary_key`` and ``unique`` arguments are not supported, and will

    raise a ``TypeError`` if used.

Has one **required** argument:

Has two optional arguments:

.. attribute:: FileField.upload_to

    .. versionchanged:: 1.7

        ``upload_to`` was required in older versions of Django.

    A local filesystem path that will be appended to your :setting:`MEDIA_ROOT`

    setting to determine the value of the

    :attr:`~django.db.models.fields.files.FieldFile.url` attribute.

                            when determining the final destination path.

    ======================  ===============================================

Also has one optional argument:

.. attribute:: FileField.storage

    Optional. A storage object, which handles the storage and retrieval of your

    A storage object, which handles the storage and retrieval of your

    files. See :doc:`/topics/files` for details on how to provide this object.

The default form widget for this field is a :class:`~django.forms.FileInput`.

   :setting:`MEDIA_URL` as the base public URL of that directory. Make sure

   that this directory is writable by the Web server's user account.

2. Add the :class:`FileField` or :class:`ImageField` to your model, making

   sure to define the :attr:`~FileField.upload_to` option to tell Django

   to which subdirectory of :setting:`MEDIA_ROOT` it should upload files.

2. Add the :class:`FileField` or :class:`ImageField` to your model, defining

   the :attr:`~FileField.upload_to` option to specify a subdirectory of

   :setting:`MEDIA_ROOT` to use for uploaded files.

3. All that will be stored in your database is a path to the file

   (relative to :setting:`MEDIA_ROOT`). You'll most likely want to use the

``ImageField``

--------------

.. class:: ImageField(upload_to=None, [height_field=None, width_field=None, max_length=100, **options])

.. class:: ImageField([upload_to=None, height_field=None, width_field=None, max_length=100, **options])

Inherits all attributes and methods from :class:`FileField`, but also

validates that the uploaded object is a valid image.

  the file system permissions of directories created during file upload, like

  :setting:`FILE_UPLOAD_PERMISSIONS` does for the files themselves.

* The :attr:`FileField.upload_to <django.db.models.FileField.upload_to>`

  attribute is now optional. If it is omitted or given ``None`` or an empty

  string, a subdirectory won't be used for storing the uploaded files.

Forms

^^^^^

    custom = models.FileField(storage=temp_storage, upload_to=custom_upload_to)

    random = models.FileField(storage=temp_storage, upload_to=random_upload_to)

    default = models.FileField(storage=temp_storage, upload_to='tests', default='tests/default.txt')

    empty = models.FileField(storage=temp_storage)