def submit(self, request):
'''
Submits this form to create the given game.
'''
members = GameMember.filterByGame(self.cleaned_data['game_id'])
them = None
me = None
for m in members:
if str(m.user_id) == request.user.pk:
me = m
if str(m.user_id) == self.cleaned_data['user_id']:
them = m
if them and me:
break
if them:
raise GameMemberAlreadyExists()
if not me:
raise PermissionDenied()
member = GameMember.fromMap(self.cleaned_data)
member.save()
return GameMemberSerializer(member).data
