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_stock.py

@@ -0,0 +1,74 @@
+"""
+This script finds stock items which are not associated with a SupplierPart, and:
+
+- Adds a SupplierPart Reference
+- Adds a PurchasePrice reference
+"""
+
+from random import randint
+
+from progress.bar import Bar
+
+from inventree.api import InvenTreeAPI
+
+from inventree.company import SupplierPart, SupplierPriceBreak
+from inventree.part import Part
+from inventree.stock import StockItem
+
+api = InvenTreeAPI("http://localhost:8000", username="admin", password="inventree")
+
+# ID for the "passives" category
+passives_category_id = 4
+
+location = 11
+
+parts = Part.list(api, category=passives_category_id, cascade=True)
+
+bar = Bar('Updating Stock Records', max=len(parts))
+
+for part in parts:
+
+    supplier_parts = SupplierPart.list(api, part=part.pk)
+
+    for sp in supplier_parts:
+
+        # Find any supplier parts without stock
+        stock_items = StockItem.list(api, part=part.pk, supplier_part=sp.pk)
+
+        # Ignore if there are existing stock items
+        if len(stock_items) > 0:
+            continue
+
+        quantity = randint(0, 100)
+
+        if quantity <= 25:
+            continue
+
+        price_breaks = SupplierPriceBreak.list(api, part=sp.pk)
+
+        pp = None
+        ppc = None
+
+
+        for pb in price_breaks:
+            if pb.quantity == 1:
+                pp = pb.price
+                ppc = pb.price_currency
+
+        # Create a new StockItem
+        StockItem.create(
+            api,
+            {
+                'part': part.pk,
+                'supplier_part': sp.pk,
+                'quantity': quantity,
+                'location': location,
+                'packaging': 'cut tape',
+                'purchase_price': pp,
+                'purchase_price_currency': ppc,
+            }
+        )
+
+    bar.next()
+
+bar.finish()