first commit

modules/purchase_product_quantity/product.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.
+
+import builtins
+from decimal import Decimal
+
+from trytond.model import fields
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Eval
+
+
+class ProductSupplier(metaclass=PoolMeta):
+    __name__ = 'purchase.product_supplier'
+
+    quantity_minimal = fields.Float(
+        "Minimal Quantity",
+        digits=(None, Eval('quantity_digits', None)),
+        domain=['OR',
+            ('quantity_minimal', '=', None),
+            ('quantity_minimal', '>', 0),
+            ])
+    quantity_rounding = fields.Float(
+        "Rounding Quantity",
+        digits=(None, Eval('quantity_digits', None)),
+        domain=['OR',
+            ('quantity_rounding', '=', None),
+            ('quantity_rounding', '>', 0),
+            ])
+    quantity_digits = fields.Function(
+        fields.Integer("Quantity Digits"),
+        'on_change_with_quantity_digits')
+
+    @fields.depends(
+        'unit',
+        'product', '_parent_product.default_uom',
+        'template', '_parent_template.default_uom')
+    def on_change_with_quantity_digits(self, name=None):
+        pool = Pool()
+        Uom = pool.get('product.uom')
+        if self.product and self.product.default_uom:
+            default_uom = self.product.default_uom
+        elif self.template and self.template.default_uom:
+            default_uom = self.template.default_uom
+        else:
+            return
+        rounding = default_uom.rounding
+        if self.unit:
+            rounding = Uom.compute_qty(
+                default_uom, rounding, self.unit, round=False)
+        return -Decimal(str(rounding)).as_tuple().exponent
+
+    def adapt_quantity(self, quantity, unit, round=True):
+        pool = Pool()
+        Uom = pool.get('product.uom')
+        quantity = Uom.compute_qty(unit, quantity, self.unit, round=False)
+        if self.quantity_minimal:
+            if quantity < self.quantity_minimal:
+                quantity = self.quantity_minimal
+        if self.quantity_rounding:
+            remainder = builtins.round(
+                quantity % self.quantity_rounding, self.quantity_digits)
+            if remainder and remainder != self.quantity_rounding:
+                quantity += (self.quantity_rounding - remainder)
+        quantity = Uom.compute_qty(self.unit, quantity, unit, round=round)
+        return quantity