MohamedMuflahi/musical-goggles

Phase 3 Code Challenge: Movies

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

We have three models: Movie, Role, and Actor.

For our purposes, a Movie has many Roles, a Actor has many Roles, and a Role belongs to a Movie and to an Actor.

Movie - Actor 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

• Active Record Migrations
• Active Record Associations
• Class and Instance Methods
• Active Record Querying

Instructions

To get started, run bundle 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 does not have tests. You cannot run rspec and you cannot run learn. You'll need to create your own sample instances so that you can try out your code on your own. Make sure your associations and methods work in the console before submitting.

We've provided you with a tool that you can use to test your code. To use it, run rake console from the command line. This will start a pry session with your classes defined. You can test out the methods that you write here. You are also encouraged to use the seeds.rb file to create sample data to test your models and associations.

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.

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.

What You Already Have

The starter code has migrations and models for the initial Actor and Movie models, and seed data for some Actors and Movies. The schema currently looks like this:

Actors Table

Column	Type
name	String

Movies Table

Column	Type
title	String
box_office_earnings	Integer

You will need to create the migration for the roles table using the attributes specified in the deliverables below.

Deliverables

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

Deliverables use the notation # for instance methods, and . for class methods.

Remember: Active Record give your classes access to a lot of methods already! Keep in mind what methods Active Record gives you access to on each of your classes when you're approaching the deliverables below.

Migrations

Before working on the rest of the deliverables, you will need to create a migration for the roles table.

• A Role belongs to a Movie, and a Role also belongs to an Actor. In your migration, create any columns your roles table will need to establish these relationships.
• The roles table should also have:
  • A salary column that stores an integer.
  • A character_name column that stores a string.

After creating the roles table using a migration, use the seeds.rb file to create instances of your Role class so you can test your code.

Once you've set up your roles table, work on building out the following deliverables.

Object Relationship Methods

Use Active Record association macros and Active Record query methods where appropriate (i.e. has_many, has_many through, and belongs_to).

Role

• Role#actor
  • should return the Actor instance for this role
• Role#movie
  • should return the Movie instance for this role

Movie

• Movie#roles
  • returns a collection of all the roles for the movie
• Movie#actors
  • returns a collection of all the actors who performed in the movie

Actor

• Actor#roles
  • should return a collection of all the roles that the actor has played
• Actor#movies
  • should return a collection of all the movies that the actor has performed in

Use rake console and check that these methods work before proceeding. For example, you should be able to call Actor.first.movies and see a list of the movies for the first actor in the database based on your seed data; and Role.first.actor should return the actor for the first role in the database.

Aggregate and Association Methods

Role

• Role#credit
  • should return a string formatted as follows: {insert character name}: Played by {insert actor name}

Movie

• Movie#cast_role(actor, character_name, salary)
  • takes a actor (an instance of the Actor class), a character_name (string), and a salary (integer) as arguments, and creates a new role in the database associated with this movie and the actor
• Movie#all_credits
  • should return an Array of strings with all the roles for this movie formatted as follows: ["{insert character name}: Played by {insert actor name}", "{insert character name}: Played by {insert actor name}", ...]
• Movie#fire_actor(actor)
  • takes an actor (an instance of the Actor class) and removes their role from this movie
  • you will have to delete a row from the roles table to get this to work!

Actor

• Actor#total_salary
  • returns the total salary for an actor based on the salary for each of their roles
• Actor#blockbusters
  • returns a collection of all the Movie instances the actor has performed in that have a box_office_earnings of over $50,000,000
• Actor.most_successful
  • returns one actor instance for the actor who has the highest total salary for all their roles