first commit

modules/account_cash_rounding/purchase.py

@@ -0,0 +1,78 @@
+# 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.model import fields
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Eval
+from trytond.transaction import Transaction
+
+
+class Purchase(metaclass=PoolMeta):
+    __name__ = 'purchase.purchase'
+
+    cash_rounding = fields.Boolean(
+        "Cash Rounding",
+        states={
+            'readonly': Eval('state') != 'draft',
+            })
+
+    @fields.depends('party')
+    def on_change_party(self):
+        cursor = Transaction().connection.cursor()
+        table = self.__table__()
+        super().on_change_party()
+        if self.party:
+            cursor.execute(*table.select(table.cash_rounding,
+                    where=table.party == self.party.id,
+                    order_by=table.id,
+                    limit=1))
+            row = cursor.fetchone()
+            if row:
+                self.cash_rounding, = row
+
+    @fields.depends(methods=['on_change_lines'])
+    def on_change_cash_rounding(self):
+        self.on_change_lines()
+
+    @fields.depends('cash_rounding', methods=['_cash_round_total_amount'])
+    def on_change_lines(self):
+        super().on_change_lines()
+        if self.cash_rounding:
+            self.total_amount = self._cash_round_total_amount(
+                self.total_amount)
+
+    @classmethod
+    def get_amount(cls, purchases, names):
+        amounts = super().get_amount(purchases, names)
+        if 'total_amount' in names:
+            total_amounts = amounts['total_amount']
+            for purchase in purchases:
+                if purchase.cash_rounding:
+                    amount = total_amounts[purchase.id]
+                    amount = purchase._cash_round_total_amount(amount)
+                    total_amounts[purchase.id] = amount
+        return amounts
+
+    @fields.depends('currency', 'payment_term', 'company')
+    def _cash_round_total_amount(self, amount):
+        from trytond.modules.account_invoice.exceptions import (
+            PaymentTermComputeError)
+        pool = Pool()
+        Date = pool.get('ir.date')
+        if self.currency:
+            amounts = [amount]
+            if self.payment_term and self.company:
+                with Transaction().set_context(company=self.company.id):
+                    today = Date.today()
+                try:
+                    term_lines = self.payment_term.compute(
+                        amount, self.company.currency, today)
+                    amounts = [a for _, a in term_lines]
+                except PaymentTermComputeError:
+                    pass
+            amount = sum(map(self.currency.cash_round, amounts))
+        return amount
+
+    def _get_invoice(self):
+        invoice = super()._get_invoice()
+        invoice.cash_rounding = self.cash_rounding
+        return invoice