Renamed related name "owned_parts" to "installed_parts"

InvenTree/stock/migrations/0051_auto_20200928_0928.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.0.7 on 2020-09-28 09:28
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0050_auto_20200821_1403'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='stockitem',
+            name='belongs_to',
+            field=models.ForeignKey(blank=True, help_text='Is this item installed in another item?', null=True, on_delete=django.db.models.deletion.DO_NOTHING, related_name='installed_parts', to='stock.StockItem', verbose_name='Installed In'),
+        ),
+    ]

InvenTree/stock/models.py

@@ -341,7 +341,7 @@ class StockItem(MPTTModel):
         'self',
         verbose_name=_('Installed In'),
         on_delete=models.DO_NOTHING,
-        related_name='owned_parts', blank=True, null=True,
+        related_name='installed_parts', blank=True, null=True,
         help_text=_('Is this item installed in another item?')
     )
 
@@ -585,6 +585,20 @@ class StockItem(MPTTModel):
 
         return True
 
+    def installedItemCount(self):
+        """
+        Return the number of stock items installed inside this one.
+        """
+
+        return self.installed_parts.count()
+
+    def hasInstalledItems(self):
+        """
+        Returns true if this stock item has other stock items installed in it.
+        """
+
+        return self.installedItemCount() > 0
+
     @property
     def children(self):
         """ Return a list of the child items which have been split from this stock item """