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 */
 7protected 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.