```ruby
class AddQueueToDelayedJobs < ActiveRecord::Migration
  def change
    add_column :delayed_jobs, :queue, :string
  end
end
```

Use legacy migration instead of rails 3.1's change method
user
```ruby
class AddQueueToDelayedJobs < ActiveRecord::Migration
  def self.up
    add_column :delayed_jobs, :queue, :string
  end

  def self.down
    remove_column :delayed_jobs, :queue
  end
end
```
assistant