HabitatMap/AirCasting

class AddPackageNameToStream < ActiveRecord::Migration[4.2]
  def change
    begin
      change_table :measurements do |t|
        t.references :stream
      end
    rescue StandardError
      nil
    end

    begin
      add_column :streams, :sensor_package_name, :text
    rescue StandardError
      nil
    end
    begin
      add_column :streams, :measurements_count, :integer
    rescue StandardError
      nil
    end

    Session.find_each do |session|
      stream =
        Stream.new(
          sensor_name: 'Phone Microphone',
          unit_name: 'decibels',
          measurement_type: 'Sound Level',
          measurement_short_type: 'dB',
          unit_symbol: 'dB',
          threshold_very_low: 20,
          threshold_low: 60,
          threshold_medium: 70,
          threshold_high: 80,
          threshold_very_high: 100,
          session: session,
          sensor_package_name: 'Builtin'
        )
      stream.save!
      execute "UPDATE measurements SET stream_id = #{
                stream.id
              } WHERE session_id = #{session.id}"
    end

    change_table :measurements do |t|
      t.remove_references :session
    end
  end
end