Do not generate full schema in UI views

.idea/drf-yasg.iml

@@ -17,6 +17,7 @@
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/testproj" isTestSource="false" />
       <excludeFolder url="file://$MODULE_DIR$/.pytest_cache" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
       <excludeFolder url="file://$MODULE_DIR$/dist" />
       <excludeFolder url="file://$MODULE_DIR$/docs/.doctrees" />
       <excludeFolder url="file://$MODULE_DIR$/docs/_build" />

src/drf_yasg/renderers.py

@@ -28,7 +28,7 @@ class _SpecRenderer(BaseRenderer):
 
         if not isinstance(data, Swagger):  # pragma: no cover
             # if `swagger` is not a ``Swagger`` object, it means we somehow got a non-success ``Response``
-            # in that case, it's probably better to let the default ``TemplateHTMLRenderer`` render it
+            # in that case, it's probably better to let the default ``JSONRenderer`` render it
             # see https://github.com/axnsan12/drf-yasg/issues/58
             return JSONRenderer().render(data, media_type, renderer_context)
         return codec.encode(data)
@@ -68,15 +68,11 @@ class _UIRenderer(BaseRenderer):
             # see https://github.com/axnsan12/drf-yasg/issues/58
             return TemplateHTMLRenderer().render(swagger, accepted_media_type, renderer_context)
         self.set_context(renderer_context, swagger)
-        return render(
+        return render(renderer_context['request'], self.template, renderer_context)
-            renderer_context['request'],
-            self.template,
-            renderer_context
-        )
 
-    def set_context(self, renderer_context, swagger):
+    def set_context(self, renderer_context, swagger=None):
-        renderer_context['title'] = swagger.info.title
+        renderer_context['title'] = swagger.info.title or '' if swagger else ''
-        renderer_context['version'] = swagger.info.version
+        renderer_context['version'] = swagger.info.version or '' if swagger else ''
         renderer_context['oauth2_config'] = json.dumps(self.get_oauth2_config())
         renderer_context['USE_SESSION_AUTH'] = swagger_settings.USE_SESSION_AUTH
         renderer_context.update(self.get_auth_urls())
@@ -119,7 +115,7 @@ class SwaggerUIRenderer(_UIRenderer):
     template = 'drf-yasg/swagger-ui.html'
     format = 'swagger'
 
-    def set_context(self, renderer_context, swagger):
+    def set_context(self, renderer_context, swagger=None):
         super(SwaggerUIRenderer, self).set_context(renderer_context, swagger)
         renderer_context['swagger_settings'] = json.dumps(self.get_swagger_ui_settings())
 
@@ -152,7 +148,7 @@ class ReDocRenderer(_UIRenderer):
     template = 'drf-yasg/redoc.html'
     format = 'redoc'
 
-    def set_context(self, renderer_context, swagger):
+    def set_context(self, renderer_context, swagger=None):
         super(ReDocRenderer, self).set_context(renderer_context, swagger)
         renderer_context['redoc_settings'] = json.dumps(self.get_redoc_settings())
 

src/drf_yasg/utils.py

@@ -273,7 +273,7 @@ def merge_params(parameters, overrides):
 def filter_none(obj):
     """Remove ``None`` values from tuples, lists or dictionaries. Return other objects as-is.
 
-    :param obj:
+    :param obj: the object
     :return: collection with ``None`` values removed
     """
     if obj is None:

src/drf_yasg/views.py

@@ -12,7 +12,8 @@ from rest_framework.views import APIView
 
 from .app_settings import swagger_settings
 from .renderers import (
-    OpenAPIRenderer, ReDocOldRenderer, ReDocRenderer, SwaggerJSONRenderer, SwaggerUIRenderer, SwaggerYAMLRenderer
+    OpenAPIRenderer, ReDocOldRenderer, ReDocRenderer, SwaggerJSONRenderer, SwaggerUIRenderer, SwaggerYAMLRenderer,
+    _SpecRenderer
 )
 
 SPEC_RENDERERS = (SwaggerYAMLRenderer, SwaggerJSONRenderer, OpenAPIRenderer)
@@ -85,7 +86,12 @@ def get_schema_view(info=None, url=None, patterns=None, urlconf=None, public=Fal
         renderer_classes = _spec_renderers
 
         def get(self, request, version='', format=None):
-            generator = self.generator_class(info, request.version or version or '', url, patterns, urlconf)
+            version = request.version or version or ''
+            if isinstance(request.accepted_renderer, _SpecRenderer):
+                generator = self.generator_class(info, version, url, patterns, urlconf)
+            else:
+                generator = self.generator_class(info, version, url, patterns=[])
+
             schema = generator.get_schema(request, self.public)
             if schema is None:
                 raise exceptions.PermissionDenied()  # pragma: no cover