Aggiunto modulo per la conversione degli oggetti in JSON

app.py

@@ -4,6 +4,7 @@ from typing import List, Dict
 
 from dateutil import relativedelta as period
 from flask import Flask
+from flask_json import FlaskJSON
 
 from db.access import fetch_european_departments, \
     fetch_department_employees, \
@@ -14,6 +15,10 @@ from db.access import fetch_european_departments, \
 from models.department import Department
 
 app = Flask(__name__)
+FlaskJSON(app)
+
+app.config['JSON_DATE_FORMAT'] = '%d/%m/%Y'
+app.config['JSON_USE_ENCODE_METHODS'] = True
 
 
 @app.get("/")
@@ -33,7 +38,7 @@ def handle_error(error):
 
 @app.get("/employee")
 def all_employees():
-    return {"employees": [e.to_json() for e in fetch_employees()]}
+    return {"employees": [e for e in fetch_employees()]}
 
 
 def __employees_group_by_seniority(departments: List[Department]) -> Dict[str, dict]:
@@ -46,7 +51,7 @@ def __employees_group_by_seniority(departments: List[Department]) -> Dict[str, d
         employee_group_by_years = itertools.groupby(department_employees,
                                                     lambda e: period.relativedelta(date.today(), e.hire_date).years)
 
-        result[department.name] = {year: [e.to_json() for e in employees]
+        result[department.name] = {year: [e for e in employees]
                                    for (year, employees) in employee_group_by_years}
 
     return result

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,

requirements.txt

@@ -3,3 +3,4 @@ psycopg2-binary~=2.9.1
 setuptools~=57.0.0
 python-dateutil~=2.8.1
 Flask~=2.0.1
+Flask-JSON~=0.3.4