educoder/db/migrate/20190907061918_migrate_bank_quotes.rb

class MigrateBankQuotes < ActiveRecord::Migration[5.2]
  def change
    HomeworkBank.all.each do |bank|
      task_count = bank.homework_commons.count
      bank.update_column("quotes", task_count == 0 ? 1 : task_count)
    end

    GtopicBank.all.each do |bank|
      task_count = bank.graduation_topics.count
      bank.update_column("quotes", task_count == 0 ? 1 : task_count)
    end

    GtaskBank.all.each do |bank|
      task_count = bank.graduation_tasks.count
      bank.update_column("quotes", task_count == 0 ? 1 : task_count)
    end

    ExerciseBank.all.each do |bank|
      if bank.container_type == 'Exercise'
        task_count = bank.exercises.count
        bank.update_column("quotes", task_count == 0 ? 1 : task_count)
      elsif bank.container_type == 'Poll'
        task_count = bank.polls.count
        bank.update_column("quotes", task_count == 0 ? 1 : task_count)
      end
    end
  end
end