scinote-web/db/migrate/20151111135802_reset_assigned_samples_counters.rb

class ResetAssignedSamplesCounters < ActiveRecord::Migration[4.2]
  def change
    Sample.find_each do |sample|
      Sample.reset_counters(sample.id, :sample_my_modules)
    end

    MyModule.find_each do |my_module|
      MyModule.reset_counters(my_module.id, :sample_my_modules)
    end
  end
end