Supplier part stock (#29)

* Add script for generating stock items with purchase price data

* Generate preview images

* Add more stock items with purchase price information

* Script for updating supplier "availability" data

* Add supplier availability data for some parts

scripts/supplier_part_availability.py

@@ -0,0 +1,46 @@
+"""
+This script adds supplier availability data to some SupplierPart objects
+"""
+
+from random import randint
+from matplotlib.style import available
+
+from progress.bar import Bar
+
+from inventree.api import InvenTreeAPI
+
+from inventree.company import SupplierPart
+from inventree.part import Part
+from inventree.stock import StockItem
+from scipy import rand
+
+api = InvenTreeAPI("http://localhost:8000", username="admin", password="inventree")
+
+# ID for the "passives" category
+passives_category_id = 4
+
+parts = Part.list(api, category=passives_category_id, cascade=True)
+
+bar = Bar('Updating Supplier Availability', max=len(parts))
+
+for part in parts:
+
+    supplier_parts = SupplierPart.list(api, part=part.pk)
+
+    for sp in supplier_parts:
+
+        # Do not update every SupplierPart instance
+        if randint(0, 10) > 3:
+            continue
+
+        available = randint(500, 50000)
+
+        sp.save(
+            data={
+                'available': available
+            }
+        )
+
+    bar.next()
+
+bar.finish()