hikehikehike / py-tickets-and-orders

Tickets and orders

• Read the guideline before start

In db/models.py you already have tables you created earlier. Now you have to create or edit tables:

1. Movie, add:
   • index on field title.
2. Order, with such fields:
   • datetime field created_at, the datetime when the order was created, set auto_now_add to fill this field automatically during the creation.
   • foreign key user, the user that created the order.

There should be implemented the string representation of the order:

print(Order.objects.first())
<Order: 2022-03-15 15:59:50.009379+00:00>

Orders should be ordered from the newest to the oldest by default.

3. Ticket, with such fields:
   • foreign key movie_session, is related to the table MovieSession
   • foreign key order, is related to the table Order
   • integer field row, the row of the seat
   • integer field seat, number of the seat in row

There should be implemented the string representation of the ticket, show information about movie session, row and seat:

print(Ticket.objects.first())
<Ticket: Speed 2020-11-11 09:30:00+00:00 (row: 6, seat: 12)>

Ticket should implement method clean(). This method should check if row and seat are correct and are not greater than values in ticket.movie_session.cinema_hall, if they are - ValidationError should be raised. You also should override method save() and add there full_clean() method call in order to call method clean() when you save the ticket.

Also fields row, seat, movie_session should be unique together. Use UniqueConstraint, constraints.

import datetime

cinema_hall = CinemaHall.objects.create(name="Blue", rows=18, seats_in_row=24)
movie_session = MovieSession.objects.create(
    show_time=datetime.datetime(2022, 3, 20, 19, 30),
    movie_id=1, 
    cinema_hall=cinema_hall)
order = Order.objects.create(user_id=1)

ticket = Ticket.objects.create(
    movie_session=movie_session,
    order=order,
    row=19,
    seat=20
)
ticket.clean()
# django.core.exceptions.ValidationError: {'row': ['row number must be in available range: (1, rows): (1, 18)']}

ticket = Ticket.objects.create(
    movie_session=movie_session,
    order=order,
    row=17,
    seat=26
)
ticket.clean()
# django.core.exceptions.ValidationError: {'seat': ['seat number must be in available range: (1, seats_in_row): (1, 24)']}

4. Custom model User, that model should inherit from AbstractUser. To replace the default user model with custom, edit settings.py, inside INSTALLED_APPS, add there two apps: "django.contrib.auth" and "django.contrib.contenttypes", also add AUTH_USER_MODEL equals to "db.User".

Use the following command to load prepared data from fixture to test and debug your code:

python manage.py loaddata cinema_db_data.json.

• After loading data from fixture you can use following superuser (or create another one by yourself):
  • Login: admin.user
  • Password: 1qazcde3

In services you already have services you created earlier. Now you have to create or edit such services:

1. Edit movie.py, edit function:
   • get_movies, add optional argument title, if title is not None, function returns result as earlier, but also filter movies with title that contains title.
2. Create user.py, add such functions:
   • create_user, takes username, password, optional parameters email, first_name, last_name. The method should save user properly (password should be encrypted), use method .create_user() for this purpose. Also, set fields if appropriate optional values are provided.
   • get_user, takes user_id, returns user with the given id.
   • update_user, takes user_id, optional parameters username, password, email, first_name, last_name. Update user with provided id and set fields if appropriate values are provided. To save password properly use the method .set_password().
3. Edit movie_session.py, add such functions:
   • get_taken_seats, takes movie_session_id - the id of the movie session, list of dicts with rows and seats of the tickets of the provided session. Example:

   get_taken_seats(movie_session_id=1) == [
        {"row": 7, "seat": 10},
        {"row": 7, "seat": 11}
    ]

4. Create order.py, add such functions:
   • create_order, takes tickets - list of the tickets, where each ticket is a dict with keys: row, seat, movie_session, username - username of the user, optional date. This method should create an order with the provided user, if date is provided, set created_at to this date. Then creates tickets with that order and data provided in tickets.

   tickets: [
       {
           "row": 6,
           "seat": 12,
           "movie_session": 1
       },
       {
           "row": 6,
           "seat": 13,
           "movie_session": 1
       }
   ]
   create_order(tickets=tickets, username="Username_1", date="2022-4-20 11:27")

   The function should be executed completely or not executed at all. For this purpose use transaction.atomic.
   • get_orders, takes optional username, if username is provided, returns all orders for the user with the provided username, else returns all orders.
5. Edit movie.py:
   • Edit create_movie, make it as transaction too.