i want to merge two DataObject::get and result puts into DropDownField
first i tryed
$en = DataObject::get("ENTourPage")->toDropdownMap('Title', 'Title');
$home = DataObject::get("PLHomePage")->toDropdownMap('Title', 'Title');
$en -> merge($home);
[...]
$fields->addFieldToTab("Root.Content.Tlumaczenie", new DropdownField('EN','Angielskie:',$wynik));
but i get
Fatal error: Call to a member function exists() on a non-object in ... on line ...
second i tryed like in here http://www.silverstripe.org/data-model-questions/show/257050#post257050
$result = new DataObjectSet();
$result -> merge (DataObject::get("ENTourPage")->toDropdownMap('Title', 'Title'));
$result -> merge (DataObject::get("PLHomePage")->toDropdownMap('Title', 'Title'));
[...]
$fields->addFieldToTab("Root.Content.Tlumaczenie", new DropdownField('EN','Angielskie:',$result));
but now i get only empty field in DropDownField