Can I override a particular field in a scaffolded form and if so where?

I have defined the field in the $db array to be of type Text but am using a DropdownField to populate it, so when I use the edit form a text box is being shown without the other options.

I have other fields in my $db array using the Enum type and they are showing in the edit form with a DropdownField type, but using an Enum type for my Text field above would result in cryptic options being displayed (i.e the values of the Dropdownfield).

I'm guessing I need to reuse my initial form on the 'Contoller extends Page_Controller' but in an edit mode with the fields pre-populated instead.

Does anybody have a link or sample code for this?

thanks

Use scaffoldSearchFields() in your class... eg.

	public function scaffoldSearchFields() 
	{ 
		$fields = parent::scaffoldSearchFields();

		//override fields
		$updatedField = new Textfield(...)

		$fields->replaceField('FieldName', $updatedField);
		return $fields; 
	   }