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.

class Track < ActiveRecord::Base
  # `tracks` is defined as INTERLEAVE IN PARENT `albums`. The primary key of `albums` is ()`singerid`, `albumid`).
  belongs_to :album, foreign_key: "albumid"

  # `tracks` also has a `singerid` column should be used to associate a Track with a Singer.
  belongs_to :singer, foreign_key: "singerid"

  # Override the default initialize method to automatically set the singer attribute when an album is given.
  def initialize attributes = nil
    super
    self.singer ||= album&.singer
  end

  def album=value
    super
    # Ensure the singer of this track is equal to the singer of the album that is set.
    self.singer = value&.singer
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
activerecord-spanner-adapter-0.7.0	examples/snippets/interleaved-tables/models/track.rb
activerecord-spanner-adapter-0.6.0	examples/snippets/interleaved-tables/models/track.rb
activerecord-spanner-adapter-0.5.0	examples/snippets/interleaved-tables/models/track.rb