application.rb

# Copyright 2021 Google LLC
#
# Use of this source code is governed by an MIT-style
# license that can be found in the LICENSE file or at
# https://opensource.org/licenses/MIT.

require "io/console"
require_relative "../config/environment"
require_relative "models/singer"
require_relative "models/album"

class Application
  def self.run # rubocop:disable Metrics/AbcSize
    # Fetch all singers and albums from the database. The database has been pre-filled by the `db/seeds.rb` script.
    puts "Known singers and their albums:"
    puts ""
    Singer.all.each do |singer|
      puts "#{singer.first_name} #{singer.last_name}"
      singer.albums.each do |album|
        puts "   #{album.title}"
      end
    end

    # Select a random singer and update the name of this singer.
    puts ""
    singer = Singer.all.sample
    puts "Current name of singer #{singer.id} is '#{singer.first_name} #{singer.last_name}'"
    puts "Updating name to 'Dave Anderson'"
    singer.first_name = "Dave"
    singer.last_name = "Anderson"
    singer.save!
    singer.reload
    puts "New name of singer #{singer.id}: #{singer.first_name} #{singer.last_name}"

    # Select all singers whose last name start with 'A'. This should include at least the singer that was updated
    # in the previous step, but probably also a number of other singers.
    puts ""
    puts "Getting all singers with a last name that starts with 'A'"

    last_name = Singer.arel_table["last_name"]
    Singer.where(last_name.matches("A%")).each do |s|
      puts "#{s.first_name} #{s.last_name}"
    end
  end
end

Application.run