socialforge/db/migrate/20140606027403_migrate_course_journals.rb

class MigrateCourseJournals < ActiveRecord::Migration
  def self.up
    # 原课程的讨论区数据迁移成新模式
    JournalsForMessage.find_all_by_jour_type('Project').each do |journal|
      project = Project.find_by_id(journal.jour_id)
      if project && project.project_type == 1
        journal.jour_type = 'Course'
        journal.jour_id = project.course_extra.id
        journal.save
      end
    end
  end

  def self.down
  end
end