Use ModelStorage hooks instead of extending create/write/delete

modules/timesheet_cost/company.py

@@ -106,20 +106,8 @@ class EmployeeCostPrice(ModelSQL, ModelView):
         return str(self.date)
 
     @classmethod
-    def delete(cls, prices):
-        Employee = Pool().get('company.employee')
-        super().delete(prices)
-        Employee._cost_prices_cache.clear()
-
-    @classmethod
-    def create(cls, vlist):
-        Employee = Pool().get('company.employee')
-        prices = super().create(vlist)
-        Employee._cost_prices_cache.clear()
-        return prices
-
-    @classmethod
-    def write(cls, *args):
-        Employee = Pool().get('company.employee')
-        super().write(*args)
+    def on_modification(cls, mode, prices, field_names=None):
+        pool = Pool()
+        Employee = pool.get('company.employee')
+        super().on_modification(mode, prices, field_names=field_names)
         Employee._cost_prices_cache.clear()

modules/timesheet_cost/timesheet.py

@@ -19,13 +19,12 @@ class Line(metaclass=PoolMeta):
         return 0
 
     @classmethod
-    def create(cls, vlist):
-        # XXX Remove cost_price because proteus set it as default value
-        vlist = [v.copy() for v in vlist]
-        for values in vlist:
+    def preprocess_values(cls, mode, values):
+        values = super().preprocess_values(mode, values)
+        if mode == 'create':
+            # XXX Remove cost_price because proteus set it as default value
             values.pop('cost_price', None)
-        lines = super().create(vlist)
-        return lines
+        return values
 
     @classmethod
     def compute_fields(self, field_names=None):