Expose "is_allocated" parameter on StockItem API

InvenTree/stock/api.py

@@ -367,6 +367,17 @@ class StockList(generics.ListCreateAPIView):
         # Filter out parts which are not actually "in stock"
         stock_list = stock_list.filter(customer=None, belongs_to=None)
 
+        # Filter by 'allocated' patrs?
+        allocated = self.request.query_params.get('allocated', None)
+
+        if allocated is not None:
+            allocated = str2bool(allocated)
+
+            if allocated:
+                stock_list = stock_list.exclude(Q(sales_order_line=None))
+            else:
+                stock_list = stock_list.filter(Q(sales_order_line=None))
+
         # Do we wish to filter by "active parts"
         active = self.request.query_params.get('active', None)
 

InvenTree/stock/migrations/0029_auto_20200421_2359.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.0.5 on 2020-04-21 23:59
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0028_auto_20200421_0724'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='stockitem',
+            name='status',
+            field=models.PositiveIntegerField(choices=[(10, 'OK'), (50, 'Attention needed'), (55, 'Damaged'), (60, 'Destroyed'), (70, 'Lost'), (110, 'Shipped'), (85, 'Returned')], default=10, validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+    ]

InvenTree/stock/models.py

@@ -397,6 +397,16 @@ class StockItem(MPTTModel):
 
     infinite = models.BooleanField(default=False)
 
+    def is_allocated(self):
+        """
+        Return True if this StockItem is allocated to a SalesOrder or a Build
+        """
+
+        # TODO - For now this only checks if the StockItem is allocated to a SalesOrder
+        # TODO - In future, once the "build" is working better, check this too
+
+        return self.sales_order_line is not None
+
     def can_delete(self):
         """ Can this stock item be deleted? It can NOT be deleted under the following circumstances:
 

InvenTree/stock/serializers.py

@@ -90,6 +90,8 @@ class StockItemSerializer(InvenTreeModelSerializer):
 
     tracking_items = serializers.IntegerField(source='tracking_info_count', read_only=True)
 
+    allocated = serializers.BooleanField(source='is_allocated', read_only=True)
+
     def __init__(self, *args, **kwargs):
 
         part_detail = kwargs.pop('part_detail', False)
@@ -110,6 +112,7 @@ class StockItemSerializer(InvenTreeModelSerializer):
     class Meta:
         model = StockItem
         fields = [
+            'allocated',
             'batch',
             'in_stock',
             'link',