Add new fields for Part object

- Creation date
- Creation user
- Responsible user

InvenTree/part/migrations/0031_auto_20200318_1044.py

@@ -0,0 +1,31 @@
+# Generated by Django 2.2.9 on 2020-03-18 10:44
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('part', '0030_auto_20200318_1027'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='part',
+            name='creation_date',
+            field=models.DateField(auto_now_add=True, null=True),
+        ),
+        migrations.AddField(
+            model_name='part',
+            name='creation_user',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='parts_created', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AddField(
+            model_name='part',
+            name='responsible',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='parts_responible', to=settings.AUTH_USER_MODEL),
+        ),
+    ]