OpenAPI: Include type key in schema object properties dict. (#7169)

Author: Kentalot

rest_framework/schemas/openapi.py

@@ -413,6 +413,7 @@ def _map_serializer(self, serializer):
             properties[field.field_name] = schema
 
         result = {
+            'type': 'object',
             'properties': properties
         }
         if required:

tests/schemas/test_openapi.py

@@ -335,6 +335,7 @@ class View(generics.GenericAPIView):
                         'schema': {
                             'type': 'array',
                             'items': {
+                                'type': 'object',
                                 'properties': {
                                     'text': {
                                         'type': 'string',
@@ -386,6 +387,7 @@ class View(generics.GenericAPIView):
                             'item': {
                                 'type': 'array',
                                 'items': {
+                                    'type': 'object',
                                     'properties': {
                                         'text': {
                                             'type': 'string',
@@ -532,6 +534,7 @@ class View(generics.GenericAPIView):
                 'content': {
                     'application/json': {
                         'schema': {
+                            'type': 'object',
                             'properties': {
                                 'text': {
                                     'type': 'string',