Terrace under the hood, part 1

audio-models.py

class AudioFile(models.Model):
    audio = models.FileField(storage=cloudfiles_storage, upload_to='audio')
    title = models.CharField(max_length=255)
    description = models.TextField(blank=True)
    duration = models.CharField(max_length=25, editable=False)
    size = models.CharField(max_length=25, editable=False)
    format = models.CharField(max_length=5, editable=False)
    uploaded = models.DateTimeField(auto_now_add=True)
    recorded = models.DateField()
    tags = models.ManyToManyField(Tags)

    def __unicode__(self):
        return self.title

helpers.py

import json
from hsaudiotag import auto
...
def sizeof_fmt(num):
    for x in ['bytes','KB','MB','GB','TB']:
        if num < 1024.0:
            return "%3.1f%s" % (num, x)
        num /= 1024.0

def get_hms(seconds):
    hours = seconds / 3600
    seconds -= 3600*hours
    minutes = seconds / 60
    seconds -= 60*minutes
    if hours is 0:
        return "%02d:%02d" % (minutes, seconds)
    return "%02d:%02d:%02d" % (hours, minutes, seconds)

def audio_save(request):
    form = AudioFileForm(request.POST,request.FILES)
    res = []
    if form.is_valid():
        obj = form.save(commit=False)
        obj.duration = get_hms(auto.File(request.FILES['audio']).duration)
        obj.size = sizeof_fmt(auto.File(request.FILES['audio']).size)
        obj.format = request.FILES['audio'].name.rsplit('.', 1)[1]
        obj.save()
        form.save_m2m()
        res.append({'title':obj.title})
    else:
        res.append({'error':form.errors})
    return HttpResponse(json.dumps(res))