Add 'virtual' part flag

InvenTree/part/migrations/0009_part_virtual.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.2 on 2019-06-18 08:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0008_auto_20190618_0042'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='part',
+            name='virtual',
+            field=models.BooleanField(default=False, help_text='Is this a virtual part, such as a software product or license?'),
+        ),
+    ]

InvenTree/part/models.py

@@ -216,6 +216,7 @@ class Part(models.Model):
         purchaseable: Can this part be purchased from suppliers?
         trackable: Trackable parts can have unique serial numbers assigned, etc, etc
         active: Is this part active? Parts are deactivated instead of being deleted
+        virtual: Is this part "virtual"? e.g. a software product or similar
         notes: Additional notes field for this part
     """
 
@@ -377,6 +378,8 @@ class Part(models.Model):
 
     active = models.BooleanField(default=True, help_text='Is this part active?')
 
+    virtual = models.BooleanField(default=False, help_text='Is this a virtual part, such as a software product or license?')
+
     notes = models.TextField(blank=True)
 
     bom_checksum = models.CharField(max_length=128, blank=True, help_text='Stored BOM checksum')