jkaplan15 / python-p3-mock-challenge-flights

Object Relations Mock Code Challenge - Flights

For this assignment, we'll be working with a Flight-style domain.

We have three models: Flight, Customer, and Booking.

For our purposes, a Flight has many Bookings, a Customer has many Bookings, and a Booking belongs to a Customer and to a Flight.

Flight - Customer is a many to many relationship.

Note: You should draw your domain on paper or on a whiteboard before you start coding. Remember to identify a single source of truth for your data.

Topics

• Classes and Instances
• Class and Instance Methods
• Variable Scope
• Object Relationships
• lists and list Methods

Instructions

To get started, run pipenv install while inside of this directory.

Build out all of the methods listed in the deliverables. The methods are listed in a suggested order, but you can feel free to tackle the ones you think are easiest. Be careful: some of the later methods rely on earlier ones.

Remember! This code challenge has tests to help you check your work. You can run pytest to make sure your code is functional before submitting.

We've provided you with a tool that you can use to test your code. To use it, run python debug.py from the command line. This will start a ipdb session with your classes defined. You can test out the methods that you write here. You can add code to the debug.py file to define variables and create sample instances of your objects.

Writing error-free code is more important than completing all of the deliverables listed - prioritize writing methods that work over writing more methods that don't work. You should test your code in the console as you write.

Similarly, messy code that works is better than clean code that doesn't. First, prioritize getting things working. Then, if there is time at the end, refactor your code to adhere to best practices. When you encounter duplicated logic, extract it into a shared helper method.

Before you submit! Save and run your code to verify that it works as you expect. If you have any methods that are not working yet, feel free to leave comments describing your progress.

Deliverables

Write the following methods in the classes in the files provided. Feel free to build out any helper methods if needed.

Initializers, Readers, and Writers

For any invalid inputs raise an Exception. In your future work, you should raise specific types of exceptions for specific error cases. You can do that here and the tests will pass, but you don't have to this time around!

Customer

• Customer __init__(self, first_name, last_name)
  • Customer should be initialized with a first name and last name
• Customer property first_name() and Customer property last_name()
  • Return first and last name, respectively
  • Names must be of type str
  • Names must be between 1 and 25 characters, inclusive
  • raise Exception if setter validation fails

Flight

• Flight __init__(self, airline)
  • Flights should be initialized with an airline, as a string
• Flight property airline()
  • Returns the flight's airline
  • Must be 1 or more characters
  • Should not be able to change after the flight is created
  • raise Exception if setter validation fails
• Flight class attribute all
  • Returns a list of all flights

Booking

• Booking __init__(self, customer, flight, price)
  • Bookings should be initialized with a customer, flight, and a price (a number)
• Booking property price()
  • Returns the price for the booking
  • Price must be a number between 500 and 3000, inclusive
  • raise Exception if setter validation fails

Object Relationships

Bookig

• Booking customer

  • Returns the customer object for that booking
  • Must be of type Customer
  • raise Exception if validation fails

• Booking flight

  • Returns the flight object for that given booking
  • Must be of type Flight
  • raise Exception if validation fails

Flight

• Flight bookings(self, new_booking=None)
  • Creates a new booking if called with new booking
  • Returns a list of all bookings for that flight
  • Bookings must be of type Booking
  • Should be called from Booking.__init__
• Flight customers(self, new_customer=None)
  • Creates a new customer if called with new customer
  • Returns a unique list of all customers who have booked a particular flight.
  • Customers must be of type Customer
  • Should be called from Booking.__init__

Customer

• Customer flights(self, new_flight=None)
  • Creates a new flight if called with new flight
  • Returns a unique list of all flights a customer has booked
  • Flights must be of type Flight
  • Should be called from Booking.__init__
• Customer bookings(self, new_booking=None)
  • Creates a new booking if called with new booking
  • Returns a list of all bookings a customer has made
  • Should be called from Booking.__init__

Aggregate and Association Methods

Customer

• Customer num_bookings()
  • Returns the total number of bookings that a customer has made

Flight

• Flight average_price(self)
  • Returns the average price for a flight based on its bookings
  • Reminder: you can calculate the average by adding up all the prices and dividing by the number of prices