socialforge/db/migrate/20151218022014_batch_delete_project_journal_activities.rb

# encoding: utf-8
class BatchDeleteProjectJournalActivities < ActiveRecord::Migration
  def up
    #ForgeActivity.where('forge_act_type = \'Journal\'').destroy_all  #需要触发回调
    count = ForgeActivity.where('forge_act_type = \'Journal\'').count / 30 + 2
    transaction do
      for i in 1 ... count do i
        ForgeActivity.where('forge_act_type = \'Journal\'').page(i).per(30).each do |activity|
            activity.destroy
        end
      end
    end
  end

  def down
  end
end