Applying a filter
https://code.sololearn.com/cka9M4wY2a6V/?ref=app It takes notes of volunteers to work at a bar on certain positions to a chosen date. The button "TerminvorschlÀge" (Opening suggestion) is to filter the list for all dates on which each workstation got a different number of volunteers (is at least chosen once, some workstations at least two times). As a result, I want to show all entry's to all dates on which the conditions are fulfilled. For filtering: No one picks a date to boolean it, the Programm should do so itself and give all possibilities. There's this saying: I'm standing on a tube. (I'm lost) Could someone help me out with (or Kickstart) the ActionEvent for the opening suggestions? Thank you so much
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