[IMP] product: add _variant_name() in product.attribute.value

To be possible to override the name_get of the variants
Closes #13053

addons/product/models/product.py

@@ -387,7 +387,7 @@ class ProductProduct(models.Model):
         for product in self.sudo():
             # display only the attributes with multiple possible values on the template
             variable_attributes = product.attribute_line_ids.filtered(lambda l: len(l.value_ids) > 1).mapped('attribute_id')
-            variant = ", ".join([v.name for v in product.attribute_value_ids if v.attribute_id in variable_attributes])
+            variant = product.attribute_value_ids._variant_name(variable_attributes)
 
             name = variant and "%s (%s)" % (product.name, variant) or product.name
             sellers = []

addons/product/models/product_attribute.py

@@ -74,6 +74,10 @@ class ProductAttributevalue(models.Model):
             raise UserError(_('The operation cannot be completed:\nYou are trying to delete an attribute value with a reference on a product variant.'))
         return super(ProductAttributevalue, self).unlink()
 
+    @api.multi
+    def _variant_name(self, variable_attributes):
+        return ", ".join([v.name for v in self if v.attribute_id in variable_attributes])
+
 
 class ProductAttributePrice(models.Model):
     _name = "product.attribute.price"