Nested Resource Routing Lab

Objectives

1. Write nested routes
2. Filter data sets based on nesting
3. Handle errors in nested routes

Overview

In this lab, we're going to extend our song library using nested resources to build new routes for our artists and songs. Then, we'll use the URL helpers in our views to expose these new routes.

We'll also be handling errors when nested resources aren't found so that we can provide a more professional experience to our users.

Instructions

The base models, controllers, views, and other files have been provided. There are tests for the lab in the spec directory. You can run tests with the rspec command.

Remember to rake db:seed to set up a starter song library!

1. Create nested resource routes to show all songs for an artist (/artists/1/songs) and individual songs for that artist (/artists/1/songs/1). Restrict the nested songs routes to index and show actions only.
2. Update the artists index view to use the new nested resource route URL helper to link to the index of all songs by that artist.
3. Update the artists show view to list each song for that artist, and use the new nested resource route helper to link each song to its corresponding show page.
4. Update the songs_controller to allow the songs#index and songs#show actions to handle a valid song for the artist.
5. In the songs#index action, if the artist can't be found, redirect to the index of artists, and set a flash[:alert] of "Artist not found."
6. In the songs#show action, if the song can't be found for a given artist, redirect to the index of the artist's songs and set a flash[:alert] of "Song not found."
7. Make sure all tests pass; then, party down!

Hints

1. For a refresher on the use of flash, see the ActionController RailsGuide.
2. Remember when filtering nested resources to query for the children through the parent, e.g., @artist.songs.find_by(id: ...)
3. There's more than one way to ride the Rails. You could handle not being able to find a record by using rescue ActiveRecord::RecordNotFound, or you could try using find_by(id: id) instead of find() and checking to see whether the result is nil.