Prevent recursive BOMs

- If A has B in its BOM, A cannot be added to the BOM of B

InvenTree/part/models.py

@@ -353,9 +353,13 @@ class BomItem(models.Model):
 
     def clean(self):
 
+        # A part cannot refer to itself in its BOM
         if self.part == self.sub_part:
             raise ValidationError(_('A part cannot contain itself as a BOM item'))
 
+        for item in self.sub_part.bom_items.all():
+            if self.part == item.sub_part:
+                raise ValidationError(_("Part '{p1}' is  used in BOM for '{p2}' (recursive)".format(p1=str(self.part), p2=str(self.sub_part))))
 
     class Meta:
         verbose_name = "BOM Item"

InvenTree/part/templates/part/bom.html

@@ -60,7 +60,10 @@ $(document).ready(function(){
         var button = $(this);
 
         launchDeleteForm("#modal-delete",
-                         button.attr('url'));
+                         button.attr('url'),
+                         {
+                             reload: true
+                         });
     });
 
     $('#bom-table').on('click', '.edit-row-button', function () {