Limit choices for Part selection

Based on is_template / virtual / active status

InvenTree/build/migrations/0010_auto_20200318_1027.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.2.9 on 2020-03-18 10:27
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('build', '0009_auto_20200210_1032'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='build',
+            name='part',
+            field=models.ForeignKey(help_text='Select part to build', limit_choices_to={'active': True, 'assembly': True, 'is_template': False, 'virtual': False}, on_delete=django.db.models.deletion.CASCADE, related_name='builds', to='part.Part'),
+        ),
+    ]

InvenTree/build/models.py

@@ -58,7 +58,8 @@ class Build(models.Model):
                              limit_choices_to={
                                  'is_template': False,
                                  'assembly': True,
-                                 'active': True
+                                 'active': True,
+                                 'virtual': False,
                              },
                              help_text=_('Select part to build'),
                              )