Improve Data Migration

Improved migration files so that they preserve data

Change-Id: I53283fd3fd207ed3f9773beea7b1ce2062b5bd9f
Signed-off-by: Parker Berberian <pberberian@iol.unh.edu>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/resource_inventory/migrations/0012_manual_20200218_1536.py b/src/resource_inventory/migrations/0012_manual_20200218_1536.py
new file mode 100644
index 0000000..378bdc3
--- /dev/null
+++ b/src/resource_inventory/migrations/0012_manual_20200218_1536.py
@@ -0,0 +1,25 @@
+# Generated by Django 2.2 on 2020-02-18 15:36
+
+from django.conf import settings
+from django.db import migrations
+
+
+def clear_networks(apps, schema_editor):
+    Network = apps.get_model('resource_inventory', 'Network')
+    Vlan = apps.get_model('resource_inventory', 'Vlan')
+    for vlan in Vlan.objects.all():
+        vlan.delete()
+    for net in Network.objects.all():
+        net.delete()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('resource_inventory', '0012_auto_20200103_1850'),
+    ]
+
+    operations = [
+        migrations.RunPython(clear_networks)
+    ]