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

We have three models: Coffee, Customer, and Order.

For our purposes, a Coffee has many Orders, a Customer has many Orders, and a Order belongs to a Customer and to a Coffee.

Coffee - 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.

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

To get started, run pipenv install while inside of this directory. Then run pipenv shell to jump into the shell.

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.

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

• Customer __init__(self, name)
  • Customer is initialized with a name
• Customer property name
  • Returns customer's name
  • Names must be of type str
  • Names must be between 1 and 15 characters, inclusive
  • Should be able to change after the customer is instantiated

• Coffee __init__(self, name)
  • Coffee is initialized with a name
• Coffee property name
  • Returns the coffee's name
  • Names must be of type str
  • Names length must be greater or equal to 3 characters
  • Should not be able to change after the coffee is instantiated
  • hint: hasattr()

• Order __init__(self, customer, coffee, price)
  • Order is initialized with a Customer instance, a Coffee instance, and a price
• Order property price
  • Returns the price for the order
  • Prices must be of type float
  • Price must be a number between 1.0 and 10.0, inclusive
  • Should not be able to change after the order is instantiated
  • hint: hasattr()

• Order property customer
  • Returns the customer object for that order
  • Must be of type Customer
• Order property coffee
  • Returns the coffee object for that order
  • Must be of type Coffee

• Coffee orders()
  • Returns a list of all orders for that coffee
  • Orders must be of type Order
• Coffee customers()
  • Returns a unique list of all customers who have ordered a particular coffee.
  • Customers must be of type Customer

• Customer orders()
  • Returns a list of all orders for that customer
  • Orders must be of type Order
• Customer coffees()
  • Returns a unique list of all coffees a customer has ordered
  • Coffees must be of type Coffee

• Customer create_order(coffee, price)
  • Receives a coffee object and a price number as arguments
  • Creates and returns a new Order instance and associates it with that customer and the coffee object provided.

• Coffee num_orders()
  • Returns the total number of times a coffee has been ordered
  • Returns 0 if the coffee has never been ordered
• Coffee average_price()
  • Returns the average price for a coffee based on its orders
  • Returns 0 if the coffee has never been ordered
  • Reminder: you can calculate the average by adding up all the orders prices and dividing by the number of orders

• Customer classmethod most_aficionado(coffee)
  • Receives a coffee object argument
  • Returns the Customer instance that has spent the most money on the coffee instance provided as argument.
  • Returns None if there are no customers for the coffee instance provided.
  • hint: will need a way to remember all Customer objects
  • Uncomment lines 137-147 in the customer_test file

• First, comment out the following lines

  • customer_test.py
    • lines 25-26, 40-41, and 44-45
  • coffee_test.py
    • lines 34-35
  • order_test.py
    • lines 46-47

• Then, uncomment the following lines in the test files

  • customer_test.py
    • lines 31-32, 48-49, and 52-53
  • coffee_test.py
    • lines 22-23, 26-27, and 38-39
  • order_test.py
    • lines 32-33, 36-37, and 50-51