TYPO3.Fluid

When using collections as preselected values for SelectView-Helper with option multiple="1" the preselection is only possible when you have a "public" identity field.

The preselection for lists does only work if "optionValueField"-Argument is set, which you cannot use with the internal flow3-identity.

First part of the solution is:

 1 /**
 2  * Retrieves the selected value(s)
 3  *
 4  * @return mixed value string or an array of strings
 5  * @author Bastian Waidelich <bastian@typo3.org>
 6  */
 7 protected function getSelectedValue() {
 8     $value = $this->getValue();
 9     if (!$this->hasArgument('optionValueField') && ! is_array($value)) {
10         return $value;
11     }

(Important is the & ! is_array())

But than further the code runs in the next problem selecting by using $this->arguments['optionValueField'] to retrieve the value.