Add document app's post init file

apps/documents/post_init.py

@@ -0,0 +1,22 @@
+from __future__ import absolute_import
+
+import tempfile
+
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+
+from common.utils import validate_path, encapsulate
+
+from .models import DocumentVersion, get_filename_from_uuid
+from .settings import STORAGE_BACKEND, CACHE_PATH
+
+
+def init_validate_cache_path():
+    if (validate_path(CACHE_PATH) == False) or (not CACHE_PATH):
+        setattr(document_settings, 'CACHE_PATH', tempfile.mkdtemp())
+
+def init_set_storage_backend():
+    # Monkey patch the file field until this is resolved: AttributeError: 
+    # The 'file' attribute can only be accessed from DocumentVersion instances.
+    #DocumentVersion.file.storage = STORAGE_BACKEND()
+    DocumentVersion.add_to_class('file', models.FileField(upload_to=get_filename_from_uuid, verbose_name=_(u'file'), storage=STORAGE_BACKEND()))