Aggiunto modulo per la conversione degli oggetti in JSON

models/department.py

@@ -19,11 +19,11 @@ class Department:
     def location_id(self) -> Location:
         return self.__location
 
-    def to_json(self):
+    def __json__(self):
         return {
             'department_id': self.__department_id,
             'name': self.__name,
-            'location': self.__location.to_json() if self.__location is not None else None
+            'location': self.__location if self.__location is not None else None
         }
 
     def __str__(self):

models/employee.py

@@ -62,14 +62,14 @@ class Employee(Person):
     def manager_id(self) -> int:
         return self.__manager_id
 
-    def to_json(self):
+    def __json__(self):
         return {
             'employee_id': self.__employee_id,
             'first_name': self.first_name,
             'last_name': self.last_name,
             'email': self.__email,
-            'hire_date': f"{self.__hire_date: %Y-%m-%d}",
-            'department': self.__department.to_json() if self.__department is not None else None,
+            'hire_date': self.__hire_date,
+            'department': self.__department if self.__department is not None else None,
             'job_id': self.__job_id,
             'salary': f"{self.__salary:,.2f}",
             'manager_id': self.__manager_id

models/location.py

@@ -32,7 +32,7 @@ class Location:
     def country_id(self) -> int:
         return self.__country_id
 
-    def to_json(self):
+    def __json__(self):
         return {
             'location_id': self.__location_id,
             'street_address': self.__street_address,