diff --git a/testproj/todo/models.py b/testproj/todo/models.py
index 46e6300..cf7c9d7 100644
--- a/testproj/todo/models.py
+++ b/testproj/todo/models.py
@@ -1,3 +1,5 @@
+from decimal import Decimal
+
 from django.db import models
 
 
@@ -18,3 +20,19 @@ class TodoYetAnother(models.Model):
 class TodoTree(models.Model):
     parent = models.ForeignKey('self', on_delete=models.CASCADE, related_name='children', null=True)
     title = models.CharField(max_length=50)
+
+
+class Pack(models.Model):
+    SIZE_10x20 = Decimal(200.000)
+    SIZE_10x10 = Decimal(100.000)
+    SIZE_5x10 = Decimal(50.000)
+
+    size_code_choices = (
+        (SIZE_5x10, '5x10'),
+        (SIZE_10x10, '10x10'),
+        (SIZE_10x20, '10x20'),
+    )
+    size_code = models.DecimalField(max_digits=7,
+                                    decimal_places=3,
+                                    choices=size_code_choices,
+                                    default=SIZE_10x20)
diff --git a/testproj/todo/serializer.py b/testproj/todo/serializer.py
index 309e582..aea435c 100644
--- a/testproj/todo/serializer.py
+++ b/testproj/todo/serializer.py
@@ -4,7 +4,7 @@ from django.utils import timezone
 from rest_framework import serializers
 from rest_framework_recursive.fields import RecursiveField
 
-from .models import Todo, TodoAnother, TodoTree, TodoYetAnother
+from .models import Pack, Todo, TodoAnother, TodoTree, TodoYetAnother
 
 
 class TodoSerializer(serializers.ModelSerializer):
@@ -57,3 +57,14 @@ class TodoRecursiveSerializer(serializers.ModelSerializer):
     class Meta:
         model = TodoTree
         fields = ('id', 'title', 'parent', 'parent_id')
+
+
+class HarvestSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Pack
+        fields = (
+            'size_code',
+        )
+        read_only_fields = (
+            'size_code',
+        )
diff --git a/testproj/todo/urls.py b/testproj/todo/urls.py
index 1add254..8f4ca25 100644
--- a/testproj/todo/urls.py
+++ b/testproj/todo/urls.py
@@ -9,6 +9,7 @@ router.register(r'another', views.TodoAnotherViewSet)
 router.register(r'yetanother', views.TodoYetAnotherViewSet)
 router.register(r'tree', views.TodoTreeView)
 router.register(r'recursive', views.TodoRecursiveView)
+router.register(r'harvest', views.HarvestViewSet)
 
 urlpatterns = router.urls
 
diff --git a/testproj/todo/views.py b/testproj/todo/views.py
index 621b9a1..17881b9 100644
--- a/testproj/todo/views.py
+++ b/testproj/todo/views.py
@@ -1,11 +1,13 @@
-from rest_framework import viewsets
+from rest_framework import mixins, permissions, viewsets
+from rest_framework.authentication import TokenAuthentication
 from rest_framework.generics import RetrieveAPIView
 
 from drf_yasg.utils import swagger_auto_schema
 
-from .models import Todo, TodoAnother, TodoTree, TodoYetAnother
+from .models import Pack, Todo, TodoAnother, TodoTree, TodoYetAnother
 from .serializer import (
-    TodoAnotherSerializer, TodoRecursiveSerializer, TodoSerializer, TodoTreeSerializer, TodoYetAnotherSerializer
+    HarvestSerializer, TodoAnotherSerializer, TodoRecursiveSerializer, TodoSerializer, TodoTreeSerializer,
+    TodoYetAnotherSerializer
 )
 
 
@@ -75,3 +77,16 @@ class TodoRecursiveView(viewsets.ModelViewSet):
     @swagger_auto_schema(responses={200: TodoRecursiveSerializer(many=True)})
     def list(self, request, *args, **kwargs):
         return super(TodoRecursiveView, self).list(request, *args, **kwargs)
+
+
+class HarvestViewSet(mixins.ListModelMixin,
+                     mixins.UpdateModelMixin,
+                     viewsets.GenericViewSet):
+
+    queryset = Pack.objects.all()
+    serializer_class = HarvestSerializer
+    permission_classes = [permissions.IsAuthenticated]
+    authentication_classes = [TokenAuthentication]
+
+    def perform_update(self, serializer):
+        pass
diff --git a/tests/reference.yaml b/tests/reference.yaml
index 00d8919..94c5749 100644
--- a/tests/reference.yaml
+++ b/tests/reference.yaml
@@ -592,6 +592,60 @@ paths:
         description: A unique integer value identifying this todo another.
         required: true
         type: integer
+  /todo/harvest/:
+    get:
+      operationId: todo_harvest_list
+      description: ''
+      parameters: []
+      responses:
+        '200':
+          description: ''
+          schema:
+            type: array
+            items:
+              $ref: '#/definitions/Harvest'
+      tags:
+        - todo
+    parameters: []
+  /todo/harvest/{id}/:
+    put:
+      operationId: todo_harvest_update
+      description: ''
+      parameters:
+        - name: data
+          in: body
+          required: true
+          schema:
+            $ref: '#/definitions/Harvest'
+      responses:
+        '200':
+          description: ''
+          schema:
+            $ref: '#/definitions/Harvest'
+      tags:
+        - todo
+    patch:
+      operationId: todo_harvest_partial_update
+      description: ''
+      parameters:
+        - name: data
+          in: body
+          required: true
+          schema:
+            $ref: '#/definitions/Harvest'
+      responses:
+        '200':
+          description: ''
+          schema:
+            $ref: '#/definitions/Harvest'
+      tags:
+        - todo
+    parameters:
+      - name: id
+        in: path
+        description: A unique integer value identifying this pack.
+        required: true
+        type: integer
   /todo/recursive/:
     get:
       operationId: todo_recursive_list
@@ -1669,6 +1723,17 @@ definitions:
         minLength: 1
       todo:
         $ref: '#/definitions/Todo'
+  Harvest:
+    type: object
+    properties:
+      size_code:
+        title: Size code
+        type: string
+        enum:
+          - '50'
+          - '100'
+          - '200'
+        readOnly: true
   TodoRecursive:
     required:
       - title