# app/avo/resources/project.rb
class Avo::Resources::Project < Avo::BaseResource
  field :type,
    as: :select,
    include_blank: 'No type'
end
```

#### Default

`nil`

#### Possible values

`nil`, `true`, `false`, or a string to be used as the first option.
</Option>

<Option name="`multiple`">

<VersionReq version="3.17.3" />

If it's set to `false` (default), it will only allow selecting a single option from the list.

If it's set to `true`, it will enable multiple selections, allowing users to choose more than one option at a time.

```ruby{5}