add field quantity_mix_required

exceptions.py

@@ -15,3 +15,6 @@ class ProductionValidationWarning(UserWarning):
 
 class DeleteSaleError(ValidationError):
     pass
+
+class ProductMixRequiredError(UserError):
+    pass

message.xml

@@ -15,5 +15,8 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.message" id="msg_delete_error">
             <field name="text">The sale '%(sale)s' can not delete </field>
         </record>
+        <record model="ir.message" id="msg_quantity_mix_error">
+            <field name="text">The quantity '%(quantity)s' must be less than '%(product_mix)s' in products mix </field>
+        </record>
     </data>
 </tryton>

product.py

@@ -2,14 +2,24 @@
 # this repository contains the full copyright notices and license terms.
 from trytond.model import fields, ModelSQL
 from trytond.pool import PoolMeta
-
+from .exceptions import ProductMixRequiredError
+from trytond.i18n import gettext
 
 class Product(metaclass=PoolMeta):
     __name__ = 'product.product'
     products_mix = fields.Many2Many('product.product-mix.option',
         'product', 'option', 'Mix')
     tasks = fields.One2Many('production.configuration_task', 'product', 'Tasks')
+    quantity_mix_required = fields.Integer('Quantity Mix Required')
 
+    @fields.depends('products_mix', 'quantity_mix_required')
+    def on_change_quantity_mix_required(self, name=None):
+        if self.products_mix and self.quantity_mix_required and len(self.products_mix) < self.quantity_mix_required:
+            raise ProductMixRequiredError(
+                gettext(
+                    "sale_pos_frontend_rest.msg_quantity_mix_error", 
+                    product_mix=len(self.products_mix), 
+                    quantity=self.quantity_mix_required))
 
 class ProductMixOption(ModelSQL):
     'Product Mix Option'

tests/test_sale_pos_commission.py

@@ -1,27 +0,0 @@
-# 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 __future__ import unicode_literals
-
-import unittest
-import doctest
-
-from trytond.tests.test_tryton import ModuleTestCase
-from trytond.tests.test_tryton import suite as test_suite
-from trytond.tests.test_tryton import doctest_setup, doctest_teardown
-from trytond.tests.test_tryton import doctest_checker
-
-
-class CommissionWaitingTestCase(ModuleTestCase):
-    'Test Commission Waiting module'
-    module = 'commission_global'
-
-
-def suite():
-    suite = test_suite()
-    suite.addTests(unittest.TestLoader().loadTestsFromTestCase(
-            CommissionWaitingTestCase))
-    suite.addTests(doctest.DocFileSuite('scenario_commission_global.rst',
-            setUp=doctest_setup, tearDown=doctest_teardown, encoding='utf-8',
-            checker=doctest_checker,
-            optionflags=doctest.REPORT_ONLY_FIRST_FAILURE))
-    return suite

view/product_form.xml

@@ -5,5 +5,7 @@ this repository contains the full copyright notices and license terms. -->
     <xpath expr="/form/notebook/page[@id='general']/field[@name='categories']"
         position="after">
         <field name="products_mix" colspan="2"/>
+        <label name="quantity_mix_required" />
+        <field name="quantity_mix_required" />
     </xpath>
 </data>