I found the answer in this discussion:
http://groups.google.com/group/django-users/browse_frm/thread/184e5e09db1efce4/7816cbc650d8dc77
Pass in the filename and content to the FileField's save() method
directly, rather than using the model instance's save() method.
On Dec 14, 2:24 pm, Brian S <bstan...@.com> wrote:
> Could someone point me in the right direction on how to save a file
> object to a FileField in a model? When I try assigning the file object
> directly to the FileField field, I get an atrribute error:
>
> myfile = open('/home/sample.txt', 'wb')
> mymodelinstance.resultFile=myfile
> mymodelinstance.save()
>
> ---------------------------------------------------------------------------
> AttributeError Traceback (most recent call
> last)
>
> /home/bstanley/projects//<ipython console> in <module>()
>
> /home/bstanley/projects//bdap/models.pyc in save(self)
> 799 super( Report, self ).save()
> 800 self.serialNumber += '-' + str( self.id )
> --> 801 super( Report, self ).save()
> 802
> 803 def __unicode__( self ):
>
> /usr/lib/python2.5/site-packages/django/db/models/base.py in save
> (self, force_insert, force_update)
> 408 raise ValueError("Cannot force both insert and
> updating in "
> 409 "model saving.")
> --> 410 self.save_base(force_insert=force_insert,
> force_update=force_update)
> 411
> 412 save.alters_data = True
>
> /usr/lib/python2.5/site-packages/django/db/models/base.py in save_base
> (self, raw, cls, origin, force_insert, force_update)
> 471 # It does already exist, so do an UPDATE.
> 472 if force_update or non_pks:
> --> 473 values = [(f, None, (raw and getattr
> (self, f.attname) or f.pre_save(self, False))) for f in non_pks]
> 474 rows = manager.filter
> (pk=pk_val)._update(values)
> 475 if force_update and not rows:
>
> /usr/lib/python2.5/site-packages/django/db/models/fields/files.py in
> pre_save(self, model_instance, add)
> 248 "Returns field's value just before saving."
> 249 file = super(FileField, self).pre_save(model_instance,
> add)
> --> 250 if file and not file._committed:
> 251 # Commit the file to storage prior to saving the
> model
> 252 file.save(file.name, file, save=False)
>
> AttributeError: 'file' object has no attribute '_committed'
> ---------------------------------------------------------------------------
>
> Checking the type of this field in another instance of this model, I
> see that it is a FieldFile object:
>
> type(anotherinstance.resultFile)
>
> >> <class 'django.db.models.fields.files.FieldFile'>
>
> ...So I'm assuming I need to construct a FieldFile object from my file
> object, then assign that to mymodelinstance.resultFile and then save
> (), but I'd like to make sure this is the preferred approach before
> going forward.
>
> Thanks.
> Brian
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