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Dropdown in ModelAdmin changes to input


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2 Posts   918 Views

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StuM

Community Member, 59 Posts

22 February 2017 at 3:53pm

Hi All,

I have a DataObject with a has one association that used to always show a dropdown in the CMS, but today changes to a text input just showing it's ID. All that happened that I noticed were some more associated DataObjects added. There are now 302, so I'm wondering if there's a limit, and if there is can I increase that somehow?

I also double checked with my dev version which only has 50 associated records running the same code and it still shows the dropdown.

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Devlin

Community Member, 344 Posts

25 February 2017 at 7:47am

Edited: 25/02/2017 7:49am

The ModelAdmin will produce a NumericField instead of a DropdownField for has_one relations if the their amount is larger 100. Because it "might exceed the available PHP memory in creating too many DataObject instances." Unfortunately this is hard coded. (@see ForeignKey->scaffoldFormField())

To workaround that you'll need to specify the relation field in getCMSFields() yourself. e.g.:

class MyRecord extends DataObject {
	private static $has_one = [
		'Category' => 'MyCategory',
	];
	public function getCMSFields() {
		$fields = new FieldList(new TabSet('Root'));

		$cat = DropdownField::create('CategoryID', 'Category')
				->setSource(MyCategory::get()->map('ID', 'Title'))
				->setHasEmptyDefault(true);
		$fields->addFieldToTab('Root.Main', $cat);

		return $fields;
	}
}