first commit

modules/carrier_weight/common.py

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+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+from trytond.pool import Pool
+
+
+def parcel_weight(parcel, carrier_uom, uom_field='unit'):
+    pool = Pool()
+    Uom = pool.get('product.uom')
+
+    weight = 0
+    for line in parcel:
+        product = getattr(line, 'product', None)
+        quantity = getattr(line, 'quantity', None)
+        uom = getattr(line, uom_field, None)
+
+        if not all([product, quantity, uom]):
+            continue
+
+        if product.weight is not None:
+            internal_quantity = Uom.compute_qty(
+                uom, quantity, product.default_uom, round=False)
+            weight += Uom.compute_qty(
+                product.weight_uom, internal_quantity * product.weight,
+                carrier_uom, round=False)
+        elif uom.category == carrier_uom.category:
+            weight += Uom.compute_qty(uom, quantity, carrier_uom, round=False)
+    return weight