```ruby
class CreateTopics < ActiveRecord::Migration
  def change
    create_table :topics do |t|
      t.string :name
      t.language :references
      t.level :references

      t.timestamps null: false
    end
  end
end
```

Fix reference lines in topics migration
user
```ruby
class CreateTopics < ActiveRecord::Migration
  def change
    create_table :topics do |t|
      t.string :name
      t.references :language
      t.references :level

      t.timestamps null: false
    end
  end
end
```
assistant