2nd-uom-mixin begonnen

mixin.py

@@ -0,0 +1,83 @@
+# -*- coding: utf-8 -*-
+# This file is part of the cashbook-module from m-ds.de for 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.pyson import Eval, Bool, Or
+from trytond.pool import Pool
+from trytond.transaction import Transaction
+from trytond.modules.product.uom import uom_conversion_digits
+from trytond.modules.cashbook.mixin import STATES, DEPENDS
+from decimal import Decimal
+
+STATESQ = {}
+STATESQ.update(STATES)
+DEPENDSQ = []
+DEPENDSQ.extend(DEPENDS)
+
+
+class SecondUomMixin(object):
+    """ two fields for second uom: quantity, rate
+    """
+    quantity_2nd_uom = fields.Numeric(string='Quantity Second UOM',
+        digits=(16, Eval('quantity2nd_digits', 4)),
+        states={
+            'readonly': Or(
+                    STATESQ['readonly'],
+                    ~Bool(Eval('quantity2nd'))
+                ),
+            'required': Bool(Eval('quantity2nd')),
+            'invisible': ~Bool(Eval('quantity2nd')),
+        }, depends=DEPENDSQ+['quantity2nd_digits', 'quantity2nd'])
+    factor_2nd_uom = fields.Function(fields.Numeric(string='Conversion factor',
+        help='Conversion factor between the units of the participating cash books.',
+        digits=(16, uom_conversion_digits),
+        states={
+            'readonly': Or(
+                    STATESQ['readonly'],
+                    ~Bool(Eval('quantity2nd'))
+                ),
+            'required': Bool(Eval('quantity2nd')),
+            'invisible': ~Bool(Eval('quantity2nd')),
+        }, depends=DEPENDSQ+['quantity2nd_digits', 'quantity2nd']),
+        'on_change_with_rate_2nd_uom', setter='set_rate_2nd_uom')
+
+    quantity2nd = fields.Function(fields.Many2One(model_name='product.uom',
+        string="2nd UOM", readonly=True), 'on_change_with_quantity2nd')
+    quantity2nd_digits = fields.Function(fields.Integer(string='2nd UOM Digits',
+        readonly=True), 'on_change_with_quantity2nd_digits')
+
+    @fields.depends('quantity', 'quantity_2nd_oum')
+    def on_change_with_factor_2nd_uom(self, name=None):
+        """ get factor from uom
+        """
+        Rate =  Pool().get('currency.currency.rate')
+
+        if (self.quantity is not None) and \
+            (self.quantity_2nd_oum is not None):
+            if self.quantity != Decimal('0.0'):
+                exp = Decimal(Decimal(1) / 10 ** Rate.rate.digits[1])
+                return (self.quantity_2nd_oum / self.quantity).quantize(exp)
+
+    @fields.depends('booktransf', '_parent_booktransf.quantity_uom', 'quantity_uom')
+    def on_change_with_quantity2nd(self, name=None):
+        """ uom of transfer-target
+        """
+        if self.booktransf:
+            if self.quantity_uom:
+                if self.booktransf.quantity_uom:
+                    if self.quantity_uom.id != \
+                        self.booktransf.quantity_uom.id:
+                        return self.booktransf.quantity_uom.id
+
+    @fields.depends('booktransf', '_parent_booktransf.quantity_digits')
+    def on_change_with_quantity2nd_digits(self, name=None):
+        """ uom of transfer-target
+        """
+        if self.booktransf:
+            return self.booktransf.quantity_digits
+        else:
+            return 2
+
+# end SecondUomMixin