class CreateSyllabusMembers < ActiveRecord::Migration
  def change
    create_table :syllabus_members do |t|
      t.integer :rank
      t.references :syllabus
      t.references :user

      t.timestamps
    end
    add_index :syllabus_members, :syllabus_id
    add_index :syllabus_members, :user_id
    add_index :syllabus_members, :rank

    count = Syllabus.all.count / 30 + 2
    transaction do
      for i in 1 ... count do i
        Syllabus.page(i).per(30).each do |syllabus|
          SyllabusMember.create(:user_id => syllabus.user_id, :syllabus_id => syllabus.id, :rank => 1)
        end
      end
    end
  end
end