doctrine - typo3 flow: variable in repository -

I want to use a variable in a typo3 flow store.

$ letters = $ _POST ['some variables'];

This works with the following stores:

  public function findLetter () {$ characters = $ _POST ['letter']; $ Query = $ this- & gt; CreateQuery (); $ Query-> Match ($ query- & gt; like ('name', $ letters)); Return $ query- & gt; carry about (); }  

I've read that in the typo 3 flow

$ letter = $ this-> request-> getArgument ('SomeVariable');

But this does not work for me; I get the following error:

# 1: Notice: Undefined property: ...... \ domain \ repository \ MitgliedRepository :: $ request in / var /www/apps/flow/Data/Temporary/Development/Cache/Code/Flow_Object_Classes/..._..._Domain_Repository_...Repository.php Line 96

line 96 in. The repository is that:

$ letters = $ this-> request-> getArgument ('letter');

Does someone know, what's wrong with me?

I found:

My administrators now link that:

/ ** * @ Cancel Cancellation * @ Exact String $ Letters * / Public Panel Letter Action ($ letters) {$ this- & gt; View- & gt; Assign ('mitglieder', $ this- & gt; mitgliedRepository- & gt; findLetter ($ Letter)); }

and my repository looks like this:

  / ** * @ layer string * / public function findLetter ($ letters) {$ query = $ This- & gt; CreateQuery (); $ Query-> Match ($ query- & gt; such ('name', $ letters)) - & gt; Set Ordering (array ('name' = & gt; \ TYPO3 \ flow \ stability \ query interface :: ORDER_ASCENDING);); Return $ query- & gt; carry about (); }