Fix security definitions ordering consistency

src/drf_yasg/generators.py

@@ -16,7 +16,7 @@ from . import openapi
 from .app_settings import swagger_settings
 from .errors import SwaggerGenerationError
 from .inspectors.field import get_basic_type_info, get_queryset_field, get_queryset_from_view
-from .openapi import ReferenceResolver
+from .openapi import ReferenceResolver, SwaggerDict
 from .utils import force_real_str, get_consumes, get_produces
 
 logger = logging.getLogger(__name__)
@@ -216,14 +216,14 @@ class OpenAPISchemaGenerator(object):
 
         security_definitions = swagger_settings.SECURITY_DEFINITIONS
         if security_definitions is not None:
-            security_definitions = OrderedDict(sorted([(key, OrderedDict(sorted(sd.items())))
-                                                       for key, sd in swagger_settings.SECURITY_DEFINITIONS.items()]))
+            security_definitions = SwaggerDict._as_odict(security_definitions, {})
+
         security_requirements = swagger_settings.SECURITY_REQUIREMENTS
         if security_requirements is None:
             security_requirements = [{security_scheme: []} for security_scheme in swagger_settings.SECURITY_DEFINITIONS]
 
-        security_requirements = sorted(security_requirements, key=lambda od: list(sorted(od)))
-        security_requirements = [OrderedDict(sorted(sr.items())) for sr in security_requirements]
+        security_requirements = [SwaggerDict._as_odict(sr, {}) for sr in security_requirements]
+        security_requirements = sorted(security_requirements, key=list)
 
         url = self.url
         if url is None and request is not None:

src/drf_yasg/openapi.py

@@ -3,6 +3,7 @@ import six
 import collections
 import logging
 import re
+import sys
 from collections import OrderedDict
 
 from coreapi.compat import urlparse
@@ -139,7 +140,10 @@ class SwaggerDict(OrderedDict):
         if isinstance(obj, collections.Mapping):
             result = OrderedDict()
             memo[id(obj)] = result
-            for attr, val in obj.items():
+            items = obj.items()
+            if not isinstance(obj, OrderedDict):
+                items = sorted(items)
+            for attr, val in items:
                 result[attr] = SwaggerDict._as_odict(val, memo)
             return result
         elif isinstance(obj, six.string_types):