You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 024_create_review_feedbacks.rb
    path of file: ./repos/expertiza/db/migrate
    
    the code of the file until where you have to start completion: class CreateReviewFeedbacks < ActiveRecord::Migration[4.2]
  def self.up
    create_table 'review_feedbacks', force: true do |t|
      t.column 'ass
    
  def self.up
    create_table 'review_feedbacks', force: true do |t|
      t.column 'assignment_id', :integer
      t.column 'review_id', :integer
      t.column 'user_id', :integer
      t.column 'feedback_at', :datetime
      t.column 'txt', :text
    end

    add_index 'review_feedbacks', ['assignment_id'], name: 'fk_review_feedback_assignments'

    execute "alter table review_feedbacks
               add constraint fk_review_feedback_assignments
               foreign key (assignment_id) references assignments(id)"

    add_index 'review_feedbacks', ['review_id'], name: 'fk_review_feedback_reviews'

    execute "alter table review_feedbacks
               add constraint fk_review_feedback_reviews
               foreign key (review_id) references reviews(id)"
  end