From d8201c44fa36c87153f3cb8239cd902ed9eaa0d0 Mon Sep 17 00:00:00 2001
From: Syrus Akbary <me@syrusakbary.com>
Date: Mon, 13 Jun 2016 19:14:49 -0700
Subject: [PATCH] Added better enum

---
 graphene/types/enum.py            | 85 ++++++++++++++++---------------
 graphene/types/tests/test_enum.py |  2 +-
 2 files changed, 44 insertions(+), 43 deletions(-)

diff --git a/graphene/types/enum.py b/graphene/types/enum.py
index 9eff8c1a..a60d26ff 100644
--- a/graphene/types/enum.py
+++ b/graphene/types/enum.py
@@ -1,7 +1,10 @@
 import six
 from graphql.type import GraphQLEnumType, GraphQLEnumValue
+from collections import OrderedDict
 
-from .definitions import ClassTypeMeta, GrapheneGraphQLType
+from .definitions import GrapheneGraphQLType
+from .options import Options
+from ..utils.is_base_type import is_base_type
 try:
     from enum import Enum as PyEnum
 except ImportError:
@@ -11,61 +14,59 @@ from .unmountedtype import UnmountedType
 
 
 class GrapheneEnumType(GrapheneGraphQLType, GraphQLEnumType):
-
-    def __init__(self, *args, **kwargs):
-        graphene_type = kwargs.pop('graphene_type')
-        self.graphene_type = graphene_type
-        self.name = None
-        self.description = None
-        self._values = None
-        self._value_lookup = None
-        self._name_lookup = None
-
-    def get_values(self):
-        # list of values GraphQLEnumValue
-        enum = self.graphene_type._meta.enum
-        values = []
-        for name, value in enum.__members__.items():
-            values.append(GraphQLEnumValue(name=name, value=value.value))
-        return values
+    pass
 
 
-class EnumTypeMeta(ClassTypeMeta):
+def values_from_enum(enum):
+    _values = OrderedDict()
+    for name, value in enum.__members__.items():
+        _values[name] = GraphQLEnumValue(name=name, value=value.value)
+    return _values
 
-    def get_options(cls, meta):
-        return cls.options_class(
-            meta,
+
+class EnumTypeMeta(type):
+
+    def __new__(cls, name, bases, attrs):
+        super_new = super(EnumTypeMeta, cls).__new__
+
+        # Also ensure initialization is only performed for subclasses of Model
+        # (excluding Model class itself).
+        if not is_base_type(bases, EnumTypeMeta):
+            return super_new(cls, name, bases, attrs)
+
+        options = Options(
+            attrs.pop('Meta', None),
             name=None,
             description=None,
             enum=None,
-            graphql_type=None,
-            abstract=False
+            graphql_type=None
         )
 
-    def construct(cls, bases, attrs):
-        if not cls._meta.graphql_type and not cls._meta.abstract:
-            cls._meta.graphql_type = GrapheneEnumType(
+        if not options.enum:
+            options.enum = type(cls.__name__, (PyEnum,), attrs)
+
+        cls = super_new(cls, name, bases, dict(attrs, _meta=options, **options.enum.__members__))
+
+        if not options.graphql_type:
+            values = values_from_enum(options.enum)
+            options.graphql_type = GrapheneEnumType(
                 graphene_type=cls,
-                name=cls._meta.name or cls.__name__,
-                description=cls._meta.description or cls.__doc__,
+                values=values,
+                name=options.name or cls.__name__,
+                description=options.description or cls.__doc__,
             )
 
-        if not cls._meta.enum:
-            cls._meta.enum = type(cls.__name__, (PyEnum,), attrs)
-
-        return super(EnumTypeMeta, cls).construct(bases, dict(attrs, **cls._meta.enum.__members__))
+        return cls
 
     def __call__(cls, *args, **kwargs):
-        if cls._meta.abstract:
-            return cls.create(PyEnum(*args, **kwargs))
+        if cls is Enum:
+            return cls.from_enum(PyEnum(*args, **kwargs))
         return super(EnumTypeMeta, cls).__call__(*args, **kwargs)
 
-    def create(cls, python_enum):
-        class Meta:
-            enum = python_enum
-        return type(Meta.enum.__name__, (Enum,), {'Meta': Meta})
-
 
 class Enum(six.with_metaclass(EnumTypeMeta, UnmountedType)):
-    class Meta:
-        abstract = True
+    @classmethod
+    def from_enum(cls, python_enum):
+        class Meta:
+            enum = python_enum
+        return type(Meta.enum.__name__, (Enum,), {'Meta': Meta})
diff --git a/graphene/types/tests/test_enum.py b/graphene/types/tests/test_enum.py
index 51b3b76c..8f07ccab 100644
--- a/graphene/types/tests/test_enum.py
+++ b/graphene/types/tests/test_enum.py
@@ -40,7 +40,7 @@ def test_enum_instance_construction():
 def test_enum_from_builtin_enum():
     PyRGB = PyEnum('RGB', 'RED,GREEN,BLUE')
 
-    RGB = Enum.create(PyRGB)
+    RGB = Enum.from_enum(PyRGB)
     assert isinstance(RGB._meta.graphql_type, GraphQLEnumType)
     values = RGB._meta.graphql_type.get_values()
     assert values == [