Ivan explanation controllers and routes in python

# controller
## users_controllers.py

def query_all_users():
    return db.get.users


def format_users():
    users = query_all_users()
    if users >= 0:
        return json.dumps({"users": users}), 200

    return json.dumps({"message": "failed fetching users"}), 500

# routes
## user_routes
@endpoint("/something", "GET")
def get_users_route(req):
    # pass req if you need to work with any info provided from the request
    return format_users(req) # you can call this one get_users_controller if you wish


# how to test
def test_format_users__users_are_present():
    users = [{}, {}, {}]
    mock("query_all_users", users)
    _, status_code = format_users()

    assert status_code == 200

def test_format_users__users_do_not_exist():
    users = None
    mock("query_all_users", users)
    _, status_code = format_users()

    assert status_code == 500