Add "optional" field to BomItem

- Defaults to False
- Indicates that the BomItem is "optional" for a build
- Will be used in the future when calculating if a Build output is fully allocated!

InvenTree/part/api.py

@@ -765,20 +765,30 @@ class BomList(generics.ListCreateAPIView):
 
         queryset = super().filter_queryset(queryset)
 
+        params = self.request.query_params
+
+        # Filter by "optional" status?
+        optional = params.get('optional', None)
+
+        if optional is not None:
+            optional = str2bool(optional)
+
+            queryset = queryset.filter(optional=optional)
+
         # Filter by part?
-        part = self.request.query_params.get('part', None)
+        part = params.get('part', None)
 
         if part is not None:
             queryset = queryset.filter(part=part)
         
         # Filter by sub-part?
-        sub_part = self.request.query_params.get('sub_part', None)
+        sub_part = params.get('sub_part', None)
 
         if sub_part is not None:
             queryset = queryset.filter(sub_part=sub_part)
 
         # Filter by "trackable" status of the sub-part
-        trackable = self.request.query_params.get('trackable', None)
+        trackable = params.get('trackable', None)
 
         if trackable is not None:
             trackable = str2bool(trackable)

InvenTree/part/forms.py

@@ -231,7 +231,8 @@ class EditBomItemForm(HelperForm):
             'quantity',
             'reference',
             'overage',
-            'note'
+            'note',
+            'optional',
         ]
 
         # Prevent editing of the part associated with this BomItem

InvenTree/part/migrations/0051_bomitem_optional.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.7 on 2020-10-04 13:34
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0050_auto_20200917_2315'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='bomitem',
+            name='optional',
+            field=models.BooleanField(default=False, help_text='This BOM item is optional'),
+        ),
+    ]

InvenTree/part/models.py

@@ -1500,6 +1500,7 @@ class BomItem(models.Model):
         part: Link to the parent part (the part that will be produced)
         sub_part: Link to the child part (the part that will be consumed)
         quantity: Number of 'sub_parts' consumed to produce one 'part'
+        optional: Boolean field describing if this BomItem is optional
         reference: BOM reference field (e.g. part designators)
         overage: Estimated losses for a Build. Can be expressed as absolute value (e.g. '7') or a percentage (e.g. '2%')
         note: Note field for this BOM item
@@ -1533,6 +1534,8 @@ class BomItem(models.Model):
     # Quantity required
     quantity = models.DecimalField(default=1.0, max_digits=15, decimal_places=5, validators=[MinValueValidator(0)], help_text=_('BOM quantity for this BOM item'))
 
+    optional = models.BooleanField(default=False, help_text=_("This BOM item is optional"))
+
     overage = models.CharField(max_length=24, blank=True, validators=[validators.validate_overage],
                                help_text=_('Estimated build wastage quantity (absolute or percentage)')
                                )

InvenTree/part/serializers.py

@@ -403,6 +403,7 @@ class BomItemSerializer(InvenTreeModelSerializer):
             'quantity',
             'reference',
             'price_range',
+            'optional',
             'overage',
             'note',
             'validated',

InvenTree/templates/js/bom.html

@@ -169,6 +169,10 @@ function loadBomTable(table, options) {
             // Let's make it a bit more pretty
             text = parseFloat(text);
 
+            if (row.optional) {
+                text += " ({% trans "Optional" %})";    
+            }
+
             if (row.overage) {
                 text += "<small> (+" + row.overage + ")    </small>";
             }