wespeters / 052223-phase3-code-challenge

Object Relations Code Challenge - Concerts

For this assignment, we'll be working with a Concert domain.

We have three models: Band, Concert, and Venue.

For our purposes, a Band has many Concerts, a Venue has many Concertss, and a Concert belongs to a Band and to a Venue.

Band - Venue 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; pipenv shell 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 pytest tests available to you. Run pytest at any time from within your virtual environment.

We've provided you with another 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.

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Deliverables

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

Note: all setters should raise Exception if their criteria are not met.

Initializers, Readers, and Writers

Band

• Band __init__(name, hometown)
  • should initialize with a name (string) and hometown (string)
• Band property name()
  • should return the Band's name
  • must be a string of greater than zero characters
• Band property hometown()
  • should return the Band's hometown
  • must be a string of greater than zero characters

Venue

• Venue __init__(title, city)
  • should initialize with a title (string) and city (string)
• Venue property title()
  • should return the title of the venue
  • must be a string of greater than zero characters
• Venue property city()
  • should return the city of the venue
  • must be a string of greater than zero characters

Concert

• Concert __init__(self, date, band, venue)
  • should initialize with a date (string), band, and venue
  • date must be a string of greater than zero characters

Object Relationship Methods and Attributes

Concert

• Concert band
  • should return the Band instance for this concert
• Concert venue
  • should return the Venue instance for this concert

Venue

• Venue concerts
  • returns a list of all the concerts for the venue
• Venue bands
  • returns a list of all the bands for the venue

Band

• Band property concerts
  • should return a list of all the concerts that the band has played in

Aggregate Methods

Concert

• Concert hometown_show()
  • returns true if the concert is in the band's hometown, false if it is not
• Concert introduction()
  • returns a string with the band's introduction for this concert
  • an introduction is in the form: "Hello {insert city name here}!!!!!, we are {insert band name here} and we're from {insert hometown here}"

Band

• Band play_in_venue(venue, date)
  • takes a venue and date (as a string) as arguments, and creates a new concert for the band in that venue on that date
• Band all_introductions()
  • returns a list of strings representing all the introductions for this band
  • each introduction is in the form "Hello {insert city name here}!!!!!, we are {insert band name here} and we're from {insert hometown here}"

Venue

• Venue concert_on(date)
  • takes a date (string) as argument
  • finds and returns the first concert on that date at that venue
  • if there is no concert on that date at that venue, returns None