rails_active_record_migrations-and-validations_exercise.md

Rails Active Record Migrations + Validations Exercise

We just learned about Rails Model migrations and validations. Let's get some more practice on what we covered by adding onto the app we just built during the lesson. You can follow along with the lesson plan to complete the steps below.

1. Create a Car resource that has make, model, year, moonroof, dealership fields. Remember to designate the correct data type for each!

2. Run the command that will update our schema.rb and add the new model to our database.

3. Oops, we forgot to add a color field to Car. Go ahead and generate a migration to add that field to our schema.

4. We really don't care where we bought our vehicle so let's remove the dealership field from our schema.

5. Add validations to require that all of our fields are present in order for a record to be persisted to the database.

6. Add a validation that year contains 4 digits and provide an error message if the year is too short.

7. Generate a migration that will rename the moonroof field to sunroof.

8. Enter rails console and add 4 cars to your database.

9. Update the color of the first Car in your database.

10. Delete the 3rd Car in your database.

BONUS

Set up a relationship between Person and Car where a car belongs_to a person and a Person has_many cars. What steps are required?