first commit

modules/stock_supply_day/purchase.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 datetime
+
+from trytond.model import ModelSQL, fields
+from trytond.pool import PoolMeta
+
+
+class ProductSupplier(metaclass=PoolMeta):
+    __name__ = 'purchase.product_supplier'
+    weekdays = fields.Many2Many(
+        'purchase.product_supplier.day', 'product_supplier', 'day',
+        "Week Days")
+
+    def compute_supply_date(self, date=None):
+        date = super().compute_supply_date(date=date)
+        earlier_date = None
+        if date != datetime.date.max:
+            for weekday in self.weekdays:
+                diff = weekday.index - date.weekday()
+                if diff < 0:
+                    diff += 7
+                new_date = date + datetime.timedelta(diff)
+
+                if earlier_date and earlier_date <= new_date:
+                    continue
+                earlier_date = new_date
+        return earlier_date or date
+
+    def compute_purchase_date(self, date):
+        later_date = None
+        for weekday in self.weekdays:
+            diff = (date.weekday() - weekday.index) % 7
+            new_date = date - datetime.timedelta(diff)
+            if later_date and later_date >= new_date:
+                continue
+            later_date = new_date
+        if later_date:
+            date = later_date
+        return super().compute_purchase_date(date)
+
+
+class ProductSupplierDay(ModelSQL):
+    __name__ = 'purchase.product_supplier.day'
+    product_supplier = fields.Many2One(
+        'purchase.product_supplier', 'Supplier',
+        required=True, ondelete='CASCADE')
+    day = fields.Many2One('ir.calendar.day', "Day", required=True)