gitlab-org--gitlab-foss/db/migrate/20130419190306_allow_merges_for_forks.rb

class AllowMergesForForks < ActiveRecord::Migration
  def self.up
    add_column :merge_requests, :target_project_id, :integer, :null => true
    MergeRequest.update_all("target_project_id = project_id")
    change_column :merge_requests, :target_project_id, :integer, :null => false
    rename_column :merge_requests, :project_id, :source_project_id
  end

  def self.down
    remove_column :merge_requests, :target_project_id
    rename_column :merge_requests, :source_project_id,:project_id
  end
end