Subclass FileField in Django REST Framework - django

Question

I have a django model that takes an audio file:
class Thing(models.Model):
audio_file = AudioFileField( upload_to=audio_dir, blank=True, null=True )
photo_file = models.ImageField( upload_to=img_dir, blank=True, null=True )
...
where the AudioFileField is a subclass of FileField that performs some validation:
class AudioFileField(models.FileField):
def validate(self, value, model_instance):
try:
if not (value.file.content_type == "audio/x-wav" or
value.file.content_type == "audio/amr" or
value.file.content_type == "video/3gpp"):
raise ValidationError(u'%s is not an audio file' % value)
except IOError:
logger.warning("no audio file given")
and the audio_dir callback sets the path and renames the file:
def audio_dir(instance, filename):
return os.path.join("audio", "recording_%s%s" % (
datetime.datetime.now().isoformat().replace(":", "-"),
os.path.splitext(filename)[1].lower() ))
In Django REST framework the ImageField works fine, but the subclassed AudioFileField doesn't. This is because the subclass serializers.FileField doesn't accept the keyword argument upload_to.
How can I expose the same functionality through the API? The audio_dir callback is particularly important to me.

Answer 1

I search how to customize filefield and I don't know if it's fix your problem. If not I will search again for it and just tell me the error.
class Thing(models.Model):
audio_file = AudioFileField(
upload_to=audio_dir,
blank=True, null=True,
content_types=['audio/x-wav', 'audio/amr', 'video/3gpp']
)
...............
class AudioFileField(models.FileField):
def __init__(self, *args, **kwargs):
self.content_types = kwargs.pop("content_types")
super(AudioFileField, self).__init__(*args, **kwargs)
def clean(self, *args, **kwargs):
data = super(AudioFileField, self).clean(*args, **kwargs)
audio_file = data.audio_file
try:
content_type = audio_file.content_type
if content_type in self.content_types:
raise ValidationError(u'{0} is not an audio file'.format(content_type))
else:
raise forms.ValidationError(_('Audio file type not supported.'))
except AttributeError:
pass
return data