update controller to match GroupAssignmentService
update controller to match GroupAssignmentService

chenwenbin928/classroom,sicipio/classroom,jasnow/classroom,adoosii/classroom,mkcode/classroom,alejandrogarciasalas/classroom,RyanTech/classroom,hackerkid/classroom,ConnorCartwright/classroom,guoyu07/classroom,chengjunjian/classroom,chengjunjian/classroom,tjhorner/classroom,jingruoruchu/classroom,ConnorCartwright/classroom,mostlybadfly/classroom,chengjunjian/classroom,BelieveC/classroom,bhanuc/classroom,sicipio/classroom,mostlybadfly/classroom,hackerkid/classroom,mostlybadfly/classroom,chenwenbin928/classroom,nfeliciano/classroom,guoyu07/classroom,jasnow/classroom,tjhorner/classroom,bhanuc/classroom,alejandrogarciasalas/classroom,AlvarezAriel/classroom,jasnow/classroom,jingruoruchu/classroom,chenwenbin928/classroom,tjhorner/classroom,mkcode/classroom,AlvarezAriel/classroom,jingruoruchu/classroom,sicipio/classroom,alejandrogarciasalas/classroom,adoosii/classroom,ConnorCartwright/classroom,adoosii/classroom,hackerkid/classroom,uqbar-project/classroom,uqbar-project/classroom,RyanTech/classroom,bhanuc/classroom,BelieveC/classroom,BelieveC/classroom,nfeliciano/classroom,uqbar-project/classroom,RyanTech/classroom,nfeliciano/classroom,AlvarezAriel/classroom,guoyu07/classroom,mkcode/classroom,BelieveC/classroom