metamaps--metamaps/db/migrate/20170208161305_add_updated_by_to_topics_synapses_and_maps.rb

class AddUpdatedByToTopicsSynapsesAndMaps < ActiveRecord::Migration[5.0]
  def change
    add_reference :topics, :updated_by, foreign_key: {to_table: :users}
    add_reference :synapses, :updated_by, foreign_key: {to_table: :users}
    add_reference :maps, :updated_by, foreign_key: {to_table: :users}
  end
end