Fill tax rule pattern of web shop with countries

When account_tax_rule_country is activated, the pattern must be filled with
from_country and to_country to compute the right tax.

Closes #13223
(grafted from 1f4f2778d399c214b93ff41ac9e11e826f7c6724)

--HG--
branch : 7.0

modules/web_shop/__init__.py

@@ -28,3 +28,6 @@ def register():
     Pool.register(
         product.Image,
         module='web_shop', type_='model', depends=['product_image'])
+    Pool.register(
+        web.Shop_TaxRuleCountry,
+        module='web_shop', type_='model', depends=['account_tax_rule_country'])

modules/web_shop/setup.py

@@ -51,6 +51,7 @@ for dep in info.get('depends', []):
 requires.append(get_require_version('trytond'))
 
 tests_require = [
+    get_require_version('trytond_account_tax_rule_country'),
     get_require_version('trytond_product_attribute'),
     get_require_version('trytond_product_image'),
     ]

modules/web_shop/tests/test_module.py

@@ -8,7 +8,8 @@ from trytond.tests.test_tryton import ModuleTestCase
 class WebShopTestCase(CompanyTestMixin, ModuleTestCase):
     'Test Web Shop module'
     module = 'web_shop'
-    extras = ['product_attribute', 'product_image']
+    extras = [
+        'account_tax_rule_country', 'product_attribute', 'product_image']
 
 
 del ModuleTestCase

modules/web_shop/tryton.cfg

@@ -10,6 +10,7 @@ depends:
     stock
     web_user
 extras_depend:
+    account_tax_rule_country
     product_attribute
     product_image
 xml:

modules/web_shop/web.py

@@ -252,6 +252,22 @@ class Shop(DeactivableMixin, ModelSQL, ModelView):
         return sale
 
 
+class Shop_TaxRuleCountry(metaclass=PoolMeta):
+    __name__ = 'web.shop'
+
+    def get_products(self, pattern=None):
+        pattern = pattern.copy() if pattern is not None else {}
+        if (self.warehouse
+                and self.warehouse.address
+                and self.warehouse.address.country):
+            pattern.setdefault(
+                'from_country', self.warehouse.address.country.id)
+        else:
+            pattern.setdefault('from_country')
+        pattern.setdefault('to_country')
+        return super().get_products(pattern=pattern)
+
+
 class Shop_Warehouse(ModelSQL):
     "Web Shop - Warehouse"
     __name__ = 'web.shop-stock.location'