sorting of motion comment sections

client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts

@@ -54,6 +54,14 @@ export class MotionCommentSectionRepositoryService extends BaseRepository<
         private http: HttpService
     ) {
         super(DS, dataSend, mapperService, viewModelStoreService, translate, MotionCommentSection, [Group]);
+
+        this.viewModelSortFn = (a: ViewMotionCommentSection, b: ViewMotionCommentSection) => {
+            if (a.weight === b.weight) {
+                return a.id - b.id;
+            } else {
+                return a.weight - b.weight;
+            }
+        };
     }
 
     public getTitle = (titleInformation: MotionCommentSectionTitleInformation) => {
@@ -109,4 +117,13 @@ export class MotionCommentSectionRepositoryService extends BaseRepository<
     private async deleteComment(motion: ViewMotion, section: ViewMotionCommentSection): Promise<void> {
         return await this.http.delete(`/rest/motions/motion/${motion.id}/manage_comments/`, { section_id: section.id });
     }
+
+    /**
+     * Sort all comment sections. All sections must be given excatly once.
+     */
+    public async sortCommentSections(sections: ViewMotionCommentSection[]): Promise<void> {
+        return await this.http.post('/rest/motions/motion-comment-section', {
+            ids: sections.map(section => section.id)
+        });
+    }
 }

client/src/app/shared/models/motions/motion-comment-section.ts

@@ -11,6 +11,7 @@ export class MotionCommentSection extends BaseModel<MotionCommentSection> {
     public name: string;
     public read_groups_id: number[];
     public write_groups_id: number[];
+    public weight: number;
 
     public constructor(input?: any) {
         super(MotionCommentSection.COLLECTIONSTRING, input);

client/src/app/site/motions/models/view-motion-comment-section.ts

@@ -48,6 +48,10 @@ export class ViewMotionCommentSection extends BaseViewModel<MotionCommentSection
         return this._writeGroups;
     }
 
+    public get weight(): number {
+        return this.section.weight;
+    }
+
     /**
      * TODO: Where is this needed? Try to avoid this.
      */

openslides/motions/migrations/0029_motioncommentsection_weight.py

@@ -0,0 +1,16 @@
+# Generated by Django 2.2.3 on 2019-07-19 10:52
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [("motions", "0028_subcategories")]
+
+    operations = [
+        migrations.AddField(
+            model_name="motioncommentsection",
+            name="weight",
+            field=models.IntegerField(default=10000),
+        )
+    ]

openslides/motions/models.py

@@ -583,6 +583,11 @@ class MotionCommentSection(RESTModelMixin, models.Model):
     These groups have write-access to the section.
     """
 
+    weight = models.IntegerField(default=10000)
+    """
+    To sort comment sections.
+    """
+
     class Meta:
         default_permissions = ()
 

openslides/motions/serializers.py

@@ -373,7 +373,8 @@ class MotionCommentSectionSerializer(ModelSerializer):
 
     class Meta:
         model = MotionCommentSection
-        fields = ("id", "name", "read_groups", "write_groups")
+        fields = ("id", "name", "read_groups", "write_groups", "weight")
+        read_only_fields = ("weight",)
 
     def create(self, validated_data):
         """ Call inform_changed_data on creation, so the cache includes the groups. """

openslides/motions/views.py

@@ -4,6 +4,7 @@ import jsonschema
 from django.contrib.auth import get_user_model
 from django.core.exceptions import ValidationError as DjangoValidationError
 from django.db import transaction
+from django.db.models import Case, When
 from django.db.models.deletion import ProtectedError
 from django.http.request import QueryDict
 from rest_framework import status
@@ -1228,7 +1229,7 @@ class MotionCommentSectionViewSet(ModelViewSet):
         """
         if self.action in ("list", "retrieve"):
             result = self.get_access_permissions().check_permissions(self.request.user)
-        elif self.action in ("create", "destroy", "update", "partial_update"):
+        elif self.action in ("create", "destroy", "update", "partial_update", "sort"):
             result = has_perm(self.request.user, "motions.can_see") and has_perm(
                 self.request.user, "motions.can_manage"
             )
@@ -1268,6 +1269,39 @@ class MotionCommentSectionViewSet(ModelViewSet):
         inform_changed_data(MotionComment.objects.filter(section=section))
         return response
 
+    @list_route(methods=["post"])
+    def sort(self, request, *args, **kwargs):
+        """
+        Changes the sorting of comment sections. Every id must be given exactly once.
+        Expected data: { ids: [<id>, <id>, ...] }
+        """
+        # Check request data format
+        ids = request.data.get("ids")
+        if not isinstance(ids, list):
+            raise ValidationError({"detail": "ids must be a list"})
+        for id in ids:
+            if not isinstance(id, int):
+                raise ValidationError({"detail": "every id must be an int"})
+
+        # Validate, that every id is given exactly once.
+        ids_set = set(ids)
+        if len(ids_set) != len(ids):
+            raise ValidationError({"detail": "only unique ids are expected"})
+        db_ids_set = set(
+            list(MotionCommentSection.objects.all().values_list(flat=True))
+        )
+        if ids_set != db_ids_set:
+            raise ValidationError({"detail": "every id must be given"})
+
+        # Ids are ok.
+        preserved = Case(*[When(pk=pk, then=pos) for pos, pk in enumerate(ids)])
+        queryset = MotionCommentSection.objects.filter(pk__in=ids).order_by(preserved)
+        for index, section in enumerate(queryset):
+            section.weight = index + 1
+            section.save()
+
+        return Response()
+
 
 class StatuteParagraphViewSet(ModelViewSet):
     """

tests/integration/motions/test_viewset.py

@@ -1331,6 +1331,77 @@ class TestMotionCommentSection(TestCase):
         self.assertEqual(MotionCommentSection.objects.count(), 1)
 
 
+class TestMotionCommentSectionSorting(TestCase):
+    """
+    Tests sorting of comment sections.
+    """
+
+    def setUp(self):
+        self.client = APIClient()
+        self.client.login(username="admin", password="admin")
+        self.section1 = MotionCommentSection(name="test_name_hponzp<zp7NUJKLAykbX")
+        self.section1.save()
+        self.section2 = MotionCommentSection(name="test_name_eix,b<bojbP'JO;<kVKL")
+        self.section2.save()
+        self.section3 = MotionCommentSection(name="test_name_ojMOeigSIOfhmpouweqc")
+        self.section3.save()
+
+    def test_simple(self):
+        response = self.client.post(
+            reverse("motioncommentsection-sort"), {"ids": [3, 2, 1]}, format="json"
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+        section1 = MotionCommentSection.objects.get(pk=1)
+        self.assertEqual(section1.weight, 3)
+        section2 = MotionCommentSection.objects.get(pk=2)
+        self.assertEqual(section2.weight, 2)
+        section3 = MotionCommentSection.objects.get(pk=3)
+        self.assertEqual(section3.weight, 1)
+
+    def test_wrong_data(self):
+        response = self.client.post(
+            reverse("motioncommentsection-sort"), {"ids": "some_string"}, format="json"
+        )
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assert_not_changed()
+
+    def test_wrong_id_type(self):
+        response = self.client.post(
+            reverse("motioncommentsection-sort"),
+            {"ids": [1, 2, "some_string"]},
+            format="json",
+        )
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assert_not_changed()
+
+    def test_missing_id(self):
+        response = self.client.post(
+            reverse("motioncommentsection-sort"), {"ids": [3, 1]}, format="json"
+        )
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assert_not_changed()
+
+    def test_duplicate_id(self):
+        response = self.client.post(
+            reverse("motioncommentsection-sort"), {"ids": [3, 2, 1, 1]}, format="json"
+        )
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assert_not_changed()
+
+    def test_wrong_id(self):
+        response = self.client.post(
+            reverse("motioncommentsection-sort"), {"ids": [3, 4, 1]}, format="json"
+        )
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assert_not_changed()
+
+    def assert_not_changed(self):
+        """ Asserts, that every comment section has the default weight of 10000. """
+        for section in MotionCommentSection.objects.all():
+            self.assertEqual(section.weight, 10000)
+
+
 class RetrieveMotionChangeRecommendation(TestCase):
     """
     Tests retrieving motion change recommendations.