ActiveStorage: Attaching file inline in Model.create / update

In the Rails guides you learn you can attach a file to a model using the attach method on you attachment:

@message.image.attach( io: File.open('/path/to/file'), filename: 'file.pdf' ) 

Super useful when your record is already created. But if you need to create a new record you can also attach your file directly in the create command:

Message.create( foo: 'baa', image: { io: File.open(Rails.root.join('image.png')), filename: 'image.png' } )