add integration test for create + next part and fix bugs

- story part of a story needs to start with current user
- turn number needs to be increased

stories/writingtogether/tests/test_views.py

@@ -2,7 +2,7 @@ from django.contrib.auth import get_user_model
 from django.test import TestCase
 from django.urls import reverse
 
-from writingtogether.models import Story, StoryPart
+from writingtogether.models import Story, StoryPart, StoryRound
 
 User = get_user_model()
 
@@ -89,4 +89,62 @@ class TestViews(TestCase):
         # each story has 2 story parts
         self.assertEqual(story_user1_parts.count(), 2)
         self.assertEqual(story_user2_parts.count(), 2)
-        self.assertEqual(story_user3_parts.count(), 2)
+        self.assertEqual(story_user3_parts.count(), 2)
+
+    def test_integration_create_and_next_part(self):
+        response = self.client.post(
+            reverse('writing:create_story_round'),
+            {
+                'name': 'test round',
+                'participants': [self.user1.pk, self.user2.pk],
+                'number_of_rounds': 2
+            }
+        )
+
+        story_round = StoryRound.objects.get()
+
+        result = story_round.get_next_story_part(self.user1)
+
+        story_user1 = Story.objects.get(started_by=self.user1.pk)
+        self.assertEqual(result.part_of, story_user1)
+        self.assertEqual(result.turn_number, 0)
+        self.assertEqual(result.user_id, self.user1.pk)
+
+    def test_integration_create_and_next_part__more_rounds(self):
+        response = self.client.post(
+            reverse('writing:create_story_round'),
+            {
+                'name': 'test round',
+                'participants': [self.user1.pk, self.user2.pk],
+                'number_of_rounds': 4
+            }
+        )
+
+        story_round = StoryRound.objects.get()
+        result = story_round.get_next_story_part(self.user1)
+
+        story_user1 = Story.objects.get(started_by=self.user1.pk)
+        self.assertEqual(result.part_of, story_user1)
+        self.assertEqual(result.turn_number, 0)
+        self.assertEqual(result.user_id, self.user1.pk)
+
+    def test_integration_create_and_next_part__second_round(self):
+        response = self.client.post(
+            reverse('writing:create_story_round'),
+            {
+                'name': 'test round',
+                'participants': [self.user1.pk, self.user2.pk],
+                'number_of_rounds': 4
+            }
+        )
+
+        story_round = StoryRound.objects.get()
+        story_round.current_turn = 1
+        story_round.save()
+
+        result = story_round.get_next_story_part(self.user1)
+
+        story_user2 = Story.objects.get(started_by=self.user2.pk)
+        self.assertEqual(result.part_of, story_user2)
+        self.assertEqual(result.turn_number, 1)
+        self.assertEqual(result.user_id, self.user1.pk)

stories/writingtogether/views.py

@@ -34,7 +34,7 @@ class StoryRoundCreate(CreateView):
         sorted_participants = sorted([user.pk for user in form.cleaned_data['participants']])
         number_of_participants = len(sorted_participants)
 
-        for user_id in sorted_participants:
+        for user_index, user_id in enumerate(sorted_participants):
             story = Story.objects.create(
                 part_of_round=self.object,
                 started_by_id=user_id
@@ -43,10 +43,10 @@ class StoryRoundCreate(CreateView):
             previous_part=None
             for i in range(form.cleaned_data['number_of_rounds']):
                 current_part = StoryPart.objects.create(
-                    user_id=sorted_participants[i % number_of_participants],
+                    user_id=sorted_participants[(user_index + i) % number_of_participants],
                     previous_part=previous_part,
                     part_of=story,
-                    turn_number=0
+                    turn_number=i,
                 )
                 previous_part = current_part