rates: speichert kurse

rate.py

@@ -0,0 +1,76 @@
+# -*- coding: utf-8 -*-
+# This file is part of the investment-module from m-ds for Tryton.
+# The COPYRIGHT file at the top level of this repository contains the
+# full copyright notices and license terms.
+
+from trytond.model import ModelView, ModelSQL, fields, Unique, Check
+from trytond.transaction import Transaction
+from trytond.pool import Pool
+from trytond.pyson import Eval, Bool
+
+
+class Rate(ModelSQL, ModelView):
+    'Rate'
+    __name__ = 'investment.rate'
+
+    asset = fields.Many2One(string='Asset', required=True,
+        select=True, ondelete='CASCADE',
+        model_name='investment.asset')
+    date = fields.Date(string='Date', required=True, select=True)
+    rate = fields.Numeric(string='Rate', required=True,
+        digits=(16, Eval('asset_digits', 4)),
+        depends=['asset_digits'])
+
+    asset_digits = fields.Function(fields.Integer(string='Digits',
+        readonly=True), 'on_change_with_asset_digits')
+    currency = fields.Function(fields.Many2One(string='Currency',
+        readonly=True, model_name='currency.currency'),
+        'on_change_with_currency')
+    uom = fields.Function(fields.Many2One(string='Uom',
+        readonly=True, model_name='product.uom'),
+        'on_change_with_uom')
+
+    @classmethod
+    def __setup__(cls):
+        super(Rate, cls).__setup__()
+        t = cls.__table__()
+        cls._sql_constraints = [
+            ('date_asset_uniq',
+                Unique(t, t.date, t.asset),
+                'investment.msg_unique_rate_date'),
+            ('check_rate',
+                Check(t, t.rate >= 0),
+                'currency.msg_rate_positive'),
+            ]
+        cls._order.insert(0, ('date', 'DESC'))
+
+    @classmethod
+    def default_date(cls):
+        """ today
+        """
+        IrDate = Pool().get('ir.date')
+        return IrDate.today()
+
+    @fields.depends('asset', '_parent_asset.uom')
+    def on_change_with_uom(self, name=None):
+        """ get unit of asset
+        """
+        if self.asset:
+            return self.asset.uom.id
+
+    @fields.depends('asset', '_parent_asset.currency')
+    def on_change_with_currency(self, name=None):
+        """ get currency
+        """
+        if self.asset:
+            return self.asset.currency.id
+
+    @fields.depends('asset', '_parent_asset.currency_digits')
+    def on_change_with_asset_digits(self, name=None):
+        """ get digits for asset
+        """
+        if self.asset:
+            return self.asset.currency_digits
+        return 4
+
+# Rate