From bd648d0cb19d47bc03c3475540087f1f38874da5 Mon Sep 17 00:00:00 2001
From: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>
Date: Thu, 5 May 2016 23:17:32 -0400
Subject: [PATCH] Postgresql needs typecasting for turning char fields into
 native UUID fields. Conditionally run the necesary SQL for this to happen.
 GitLab issue #266 Thanks to Baptiste GAULLET @bat79a for finding the
 solution.

---
 .../migrations/0032_auto_20160315_0537.py          | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/mayan/apps/documents/migrations/0032_auto_20160315_0537.py b/mayan/apps/documents/migrations/0032_auto_20160315_0537.py
index 0e413efaca..903850a24c 100644
--- a/mayan/apps/documents/migrations/0032_auto_20160315_0537.py
+++ b/mayan/apps/documents/migrations/0032_auto_20160315_0537.py
@@ -1,12 +1,12 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import migrations, models
 import uuid
 
+from django.db import connection, migrations, models
+
 
 class Migration(migrations.Migration):
-
     dependencies = [
         ('documents', '0031_convert_uuid'),
     ]
@@ -18,3 +18,13 @@ class Migration(migrations.Migration):
             field=models.UUIDField(default=uuid.uuid4, editable=False),
         ),
     ]
+
+    def __init__(self, *args, **kwargs):
+        super(Migration, self).__init__(*args, **kwargs)
+
+        if connection.vendor == 'postgresql':
+            self.operations.insert(
+                0, migrations.RunSQL(
+                    'ALTER TABLE documents_document ALTER COLUMN uuid SET DATA TYPE UUID USING uuid::uuid;'
+                )
+            )