Add migration code for the removal of UUID_FUNCTION

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/documents/migrations/0003_auto_20150608_1915.py

@@ -1,8 +1,11 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
+import uuid 
+
 from django.db import models, migrations
 from django.core.files.storage import FileSystemStorage
+from django.utils.encoding import force_text
 
 import mayan.apps.documents.models
 
@@ -18,7 +21,7 @@ class Migration(migrations.Migration):
             model_name='document',
             name='uuid',
             field=models.CharField(
-                default=mayan.apps.documents.models.UUID_FUNCTION, max_length=48,
+                default=force_text(uuid.uuid4()), max_length=48,
                 editable=False
             ),
             preserve_default=True,
@@ -27,7 +30,7 @@ class Migration(migrations.Migration):
             model_name='documentversion',
             name='file',
             field=models.FileField(
-                upload_to=mayan.apps.documents.models.UUID_FUNCTION,
+                upload_to=force_text(uuid.uuid4()),
                 storage=FileSystemStorage(),
                 verbose_name='File'
             ),

mayan/apps/documents/migrations/0042_auto_20180403_0702.py

@@ -1,9 +1,10 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.11 on 2018-04-03 07:02
 from __future__ import unicode_literals
 
+import uuid 
+
 import django.core.files.storage
 from django.db import migrations, models
+from django.utils.encoding import force_text
 
 import mayan.apps.documents.models
 
@@ -18,6 +19,10 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='documentversion',
             name='file',
-            field=models.FileField(storage=django.core.files.storage.FileSystemStorage(location=b'mayan/media/document_storage'), upload_to=mayan.apps.documents.models.UUID_FUNCTION, verbose_name='File'),
+            field=models.FileField(
+                storage=django.core.files.storage.FileSystemStorage(
+                    location=b'mayan/media/document_storage'
+                ), upload_to=force_text(uuid.uuid4()), verbose_name='File'
+            ),
         ),
     ]

mayan/apps/documents/migrations/0043_auto_20180429_0759.py

@@ -1,9 +1,10 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.11 on 2018-04-29 07:59
 from __future__ import unicode_literals
 
+import uuid
+
 import django.core.files.storage
 from django.db import migrations, models
+from django.utils.encoding import force_text
 
 import mayan.apps.documents.models
 
@@ -23,7 +24,11 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='documentversion',
             name='file',
-            field=models.FileField(storage=django.core.files.storage.FileSystemStorage(location=b'/home/rosarior/development/mayan-edms/mayan/media/document_storage'), upload_to=mayan.apps.documents.models.UUID_FUNCTION, verbose_name='File'),
+            field=models.FileField(
+                storage=django.core.files.storage.FileSystemStorage(
+                    location=b'/home/rosarior/development/mayan-edms/mayan/media/document_storage'
+                ), upload_to=force_text(uuid.uuid4()), verbose_name='File'
+            ),
         ),
         migrations.AlterField(
             model_name='documentversion',