```ruby
class AddIsAdminToUsers < ActiveRecord::Migration
  def change
    add_column :users, :is_admin, :boolean
  end
end
```

Add is_admin field to users table.
user
```ruby
class AddIsAdminToUsers < ActiveRecord::Migration
  def change
    add_column :users, :is_admin, :boolean, default: false
  end
end
```
assistant