Mixin for ActiveRecord/Rails to dump Sqitch metadata along with DB schema/structure

rails_sqitch_dumper.rb

# Chain sqitch metadata dump to structure.sql dumping
#
# Structure dump does not include any data
# whilst Sqitch expect its metadata at all times.
# This allows to cache DB schema in a single sql dump to speed up tests
# while allowing continuous deployment of new changes with sqitch.
#
# sqitch deploy ...
# bundle exec rails db:structure:dump RAILS_ENV=test
# bundle exec rails test
module SqitchDumper
  def structure_dump(filename, extra_flags)
    super
    cmd = "pg_dump -a -n sqitch -x -O #{configuration['database']}"
    File.open(filename, 'a') { |f| f << `#{cmd}` }  end
end
ActiveRecord::Tasks::PostgreSQLDatabaseTasks.prepend(SqitchDumper)