storage: use sizefield for disk size

fixes !5

circle/circle/settings/base.py

@@ -223,6 +223,7 @@ THIRD_PARTY_APPS = (
     'django_tables2',
     'crispy_forms',
     'djcelery',
+    'sizefield',
 )
 
 # Apps specific for this project go here.

circle/storage/models.py

@@ -4,12 +4,12 @@ import logging
 import uuid
 
 from django.db import models
-from django.utils.translation import ugettext_lazy as _
 from django.db.models.signals import post_delete
+from django.utils.translation import ugettext_lazy as _
 from model_utils.models import TimeStampedModel
+from sizefield.models import FileSizeField
 
 from manager import storage_manager
-
 import tasks
 
 logger = logging.getLogger(__name__)
@@ -46,7 +46,7 @@ class Disk(TimeStampedModel):
     filename = models.CharField(max_length=256, verbose_name=_('filename'))
     datastore = models.ForeignKey(DataStore)
     type = models.CharField(max_length=10, choices=TYPES)
-    size = models.IntegerField()
+    size = FileSizeField()
     base = models.ForeignKey('self', blank=True, null=True,
                              related_name='derivatives')
     ready = models.BooleanField(default=False)

requirements/base.txt

@@ -5,7 +5,9 @@ django-braces==1.2.2
 django-celery==3.0.23
 django-crispy-forms==1.4.0
 django-model-utils==1.4.0
+django-sizefield==0.4
 django-tables2==0.14.0
+django-taggit==0.10a1
 logutils==0.3.3
 netaddr==0.7.10
 South==0.8.1