+ toggle_vote_against(prompt_id, session_id) {
+ const player = this.players_by_session[session_id];
+
+ const prompt = this.state.prompts.find(p => p.id === prompt_id);
+ if (! prompt || ! player)
+ return false;
+
+ prompt.toggle_vote_against(player.name);
+
+ this.broadcast_event_object('prompt', prompt);
+
+ return true;
+ }
+