Add get_path_parameters() for operations.

rest_framework/schemas/inspectors.py

@@ -503,5 +503,37 @@ class DefaultSchema(ViewInspector):
 class OpenAPIAutoSchema(ViewInspector):
 
     def get_operation(self, path, method):
-        # TODO: fill in details here.
-        return {}
+        return {
+            'parameters': self.get_path_parameters(path, method),
+        }
+
+    def get_path_parameters(self, path, method):
+        """
+        Return a list of parameters from templated path variables.
+        """
+        model = getattr(getattr(self.view, 'queryset', None), 'model', None)
+        parameters = []
+
+        for variable in uritemplate.variables(path):
+            description = ''
+            if model is not None:
+                # Attempt to infer a field description if possible.
+                try:
+                    model_field = model._meta.get_field(variable)
+                except Exception:
+                    model_field = None
+
+                if model_field is not None and model_field.help_text:
+                    description = force_text(model_field.help_text)
+                elif model_field is not None and model_field.primary_key:
+                    description = get_pk_description(model, model_field)
+
+            parameter = {
+                "name": variable,
+                "in": "path",
+                "required": True,
+                "description": description,
+            }
+            parameters.append(parameter)
+
+        return parameters

tests/schemas/test_openapi.py

@@ -20,7 +20,7 @@ def create_view(view_cls, method, request):
     return view
 
 
-class TestInspector(TestCase):
+class TestOperationIntrospection(TestCase):
 
     def test_path_without_parameters(self):
         path = '/example/'
@@ -35,9 +35,30 @@ class TestInspector(TestCase):
         inspector.view = view
 
         operation = inspector.get_operation(path, method)
-        assert operation == {}
+        assert operation == {
+            'parameters': []
+        }
 
-    # TODO: parameters, operationID, responses, etc ???
+    def test_path_with_id_parameter(self):
+        path = '/example/{id}/'
+        method = 'GET'
+
+        view = create_view(
+            views.ExampleDetailView,
+            method,
+            create_request(path)
+        )
+        inspector = OpenAPIAutoSchema()
+        inspector.view = view
+        operation = inspector.get_operation(path, method)
+        assert operation == {
+            'parameters': [{
+                'description': '',
+                'in': 'path',
+                'name': 'id',
+                'required': True,
+            }]
+        }
 
 
 @override_settings(REST_FRAMEWORK={'DEFAULT_SCHEMA_CLASS': 'rest_framework.schemas.inspectors.OpenAPIAutoSchema'})

tests/schemas/views.py

@@ -6,9 +6,8 @@ from rest_framework.decorators import action
 from rest_framework.views import APIView
 from rest_framework.viewsets import ModelViewSet
 
+
 # Simple APIViews:
-
-
 class ExampleListView(APIView):
     permission_classes = [permissions.IsAuthenticatedOrReadOnly]
 
@@ -27,7 +26,6 @@ class ExampleDetailView(APIView):
 
 
 # Classes for ExampleViewSet
-
 class ExamplePagination(pagination.PageNumberPagination):
     page_size = 100
     page_size_query_param = 'page_size'
@@ -110,7 +108,6 @@ class ExampleViewSet(ModelViewSet):
 
 
 # ExampleViewSet subclasses
-
 class DenyAllUsingHttp404(permissions.BasePermission):
 
     def has_permission(self, request, view):