From 4eb8c60ee02338c7bbf95c956093f41f7d1de734 Mon Sep 17 00:00:00 2001
From: Oliver Walters <oliver.henry.walters@gmail.com>
Date: Tue, 12 Oct 2021 22:22:49 +1100
Subject: [PATCH] Add new BomItemSubstitute model

---
 InvenTree/part/models.py | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 8c43a623a0..f883250811 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -2613,6 +2613,36 @@ class BomItem(models.Model):
         return "{pmin} to {pmax}".format(pmin=pmin, pmax=pmax)
 
 
+class BomItemSubstitute(models.Model):
+    """
+    A BomItemSubstitute provides a specification for alternative parts,
+    which can be used in a bill of materials.
+
+    Attributes:
+        bom_item: Link to the parent BomItem instance
+        part: The part which can be used as a substitute
+    """
+
+    bom_item = models.ForeignKey(
+        BomItem,
+        on_delete=models.CASCADE,
+        related_name='substitutes',
+        verbose_name=_('BOM Item'),
+        help_text=_('Parent BOM item'),
+    )
+
+    part = models.ForeignKey(
+        Part,
+        on_delete=models.CASCADE,
+        related_name='substitute_items',
+        verbose_name=_('Part'),
+        help_text=_('Substitute part'),
+        limit_choices_to={
+            'component': True,
+        }
+    )
+
+
 class PartRelated(models.Model):
     """ Store and handle related parts (eg. mating connector, crimps, etc.) """