cesarWrites / phase-4-active-record-associations-review-lab

Active Record Associations Review Lab

Learning Goals

• Create one-to-many and many-to-many associations
• Use has_many, belongs_to and has_many :through Active Record macros

Instructions

Flatiron School has started its own taxi service, FlatironX, and we need to start developing the application's domain model!

Three basic models have already been created, Passenger, Ride, and Taxi.

Your job is set up a has_many :through relationship between these three models so that we can keep track of who's driving who around. It will work like this:

Taxi -< Rides >- Passengers

This way, a taxi can have many passengers, and a passenger can have many taxis!

Deliverables

Updating the Database with Migrations

Each table only has a primary key, so you'll need to add the foreign keys to the appropriate model so that Active Record can handle the "has_many :through" relationship.

You can either edit the migration files directly and add the foreign keys, or generate a new migration with rails g migration to add columns to the appropriate table.

Once your migrations are done, run rails db:migrate to run the migrations.

Adding Active Record Macros

After completing the migrations, you'll also need to update the Taxi, Passenger, and Ride models with the appropriate Active Record macros.

The tests expect to be able to call certain instance methods on each of these models, such as passenger.taxis, so make sure to add the appropriate has_many and belongs_to macros to your models.

Check out the join table section in the Active Record Association Rails Guide if you need a refresher on these.

Resources

• Active Record Associations
• Active Record Associations: Join Table section