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Contents
# 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
puts ""
puts "Press any key to end the application"
STDIN.getch
end
end
Application.run
Version data entries
21 entries across 21 versions & 1 rubygems