Allow players to retract their vote on a team. (#16)

Closes #3.

avalon/avalon_game/templates/vote_base.html

@@ -31,10 +31,13 @@
     <button type="submit" formaction="{% url 'retract_team' access_code=access_code player_secret=player_secret round_num=round_num vote_num=vote_num %}" class="button-cancel">Change team</button>
   </div>
   {% endif %}
-  </form>
 
   {% if player_vote %}
     <p>You are voting: {{ player_vote }}</p>
+    <div class="button-container">
+      <button type="submit" formaction="{% url 'vote' access_code=access_code player_secret=player_secret round_num=round_num vote_num=vote_num vote='cancel' %}" class="button-cancel-vote">Retract vote</button>
+    </div>
+  </form>
   {% endif %}
 {% endblock %}
 

avalon/avalon_game/urls.py

@@ -17,7 +17,7 @@ urlpatterns = [
             url(r'^ready/$', views.ready, name='ready'),
             url(r'^cancel_game/$', views.cancel_game, name='cancel_game'),
             url(r'^(?P<round_num>[1-5])/(?P<vote_num>[1-5])/', include([
-                url(r'^vote/(?P<vote>(approve|reject))/$', views.vote, name='vote'),
+                url(r'^vote/(?P<vote>(approve|reject|cancel))/$', views.vote, name='vote'),
                 url(r'^choose/(?P<who>[0-9])/$', views.choose, name='choose'),
                 url(r'^unchoose/(?P<who>[0-9])/$', views.unchoose, name='unchoose'),
                 url(r'^finalize_team/$', views.finalize_team, name='finalize_team'),

avalon/avalon_game/views.py

@@ -483,28 +483,34 @@ def vote(request, game, player, round_num, vote_num, vote):
         if vote_round.vote_status == VoteRound.VOTE_STATUS_VOTING\
                 and vote_round.game_round.round_num == round_num\
                 and vote_round.vote_num == vote_num:
-            accept = vote == "approve"
-            vote_round.playervote_set\
-                      .update_or_create(defaults={'accept': accept},
-                                        player=player)
-            team_approved = vote_round.team_approved()
-            if team_approved is not None:
-                # All players voted, voting round is over.
-                vote_round.vote_status = VoteRound.VOTE_STATUS_VOTED
-                vote_round.save()
-                if team_approved:
-                    # Team was approved
-                    game.game_phase = Game.GAME_PHASE_MISSION
-                else:
-                    # Team was rejected
-                    if vote_round.is_final_vote():
-                        game.game_phase = Game.GAME_PHASE_END
+            if vote == "cancel":
+                try:
+                    vote_round.playervote_set.get(player=player).delete()
+                except PlayerVote.DoesNotExist:
+                    pass
+            else:
+                accept = vote == "approve"
+                vote_round.playervote_set\
+                          .update_or_create(defaults={'accept': accept},
+                                            player=player)
+                team_approved = vote_round.team_approved()
+                if team_approved is not None:
+                    # All players voted, voting round is over.
+                    vote_round.vote_status = VoteRound.VOTE_STATUS_VOTED
+                    vote_round.save()
+                    if team_approved:
+                        # Team was approved
+                        game.game_phase = Game.GAME_PHASE_MISSION
                     else:
-                        game.game_phase = Game.GAME_PHASE_PICK
-                        VoteRound.objects\
-                                 .create(game_round=vote_round.game_round,
-                                         vote_num=vote_round.vote_num+1,
-                                         leader=vote_round.next_leader())
+                        # Team was rejected
+                        if vote_round.is_final_vote():
+                            game.game_phase = Game.GAME_PHASE_END
+                        else:
+                            game.game_phase = Game.GAME_PHASE_PICK
+                            VoteRound.objects\
+                                     .create(game_round=vote_round.game_round,
+                                             vote_num=vote_round.vote_num+1,
+                                             leader=vote_round.next_leader())
                 game.save()
 
     return redirect('game', access_code=game.access_code,