FileField overwrites Database Entries

[Moritz Schlarb]

Hello at all!

I'm using the Turbogears 2.1 Admin extension (tgext.admin) that uses sprox heavily to provide a CRUD interface for the sqlalchemy model.

Since I have some PickleType columns in my model that should only be filled by uploading plain files, I created the following form:

class TestEditForm(EditableForm):

    __model__ = Test

    __require_fields__     = ['type']

    __omit_fields__        = ['id', 'assignment_id']

    __field_order__        = ['assignment', 'type', 'visible', 'timeout', 'argv', 'input', 'output']

    

    input = FileField(id='input', validator=FieldStorageUploadConverter(not_empty=False))

    output = FileField(id='output',validator=FieldStorageUploadConverter(not_empty=False))

which is included via

class TestCrudConfig(CrudRestControllerConfig):

    edit_form_type = TestEditForm

and

class MyAdminConfig(AdminConfig):

    test = TestCrudConfig

Now if there is already data in the input/output columns, it just gets overwritten with None if the file isn't uploaded again.

Am I missing a parameter to accomplish this non-overwriting behaviour?

Or could someone tell me some hackish way to achieve this!

Thanks a lot,

Moritz