From 4d5a091d169f1251a5d822b75a4e98de001e442b Mon Sep 17 00:00:00 2001
From: cherls <9567369+cherls@users.noreply.github.com>
Date: Mon, 5 Nov 2018 13:30:05 -0500
Subject: [PATCH 1/2] Add default Field description as docstring

---
 graphene/types/mutation.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/graphene/types/mutation.py b/graphene/types/mutation.py
index aa8f86bb..dd09e461 100644
--- a/graphene/types/mutation.py
+++ b/graphene/types/mutation.py
@@ -85,7 +85,7 @@ class Mutation(ObjectType):
             args=cls._meta.arguments,
             resolver=cls._meta.resolver,
             name=name,
-            description=description,
+            description=description or cls._meta.description,
             deprecation_reason=deprecation_reason,
             required=required,
         )

From 8e53672a1d9fed4c9849e7fd122cbf71c426e1b7 Mon Sep 17 00:00:00 2001
From: cherls <9567369+cherls@users.noreply.github.com>
Date: Mon, 5 Nov 2018 13:30:09 -0500
Subject: [PATCH 2/2] Add mutation field default arg test

---
 graphene/types/tests/test_mutation.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/graphene/types/tests/test_mutation.py b/graphene/types/tests/test_mutation.py
index 9755ad23..8558dc7a 100644
--- a/graphene/types/tests/test_mutation.py
+++ b/graphene/types/tests/test_mutation.py
@@ -139,17 +139,41 @@ def test_mutation_allow_to_have_custom_args():
 
     class MyMutation(ObjectType):
         create_user = CreateUser.Field(
+            name="createUser",
             description="Create a user",
             deprecation_reason="Is deprecated",
             required=True,
         )
 
     field = MyMutation._meta.fields["create_user"]
+    assert field.name == "createUser"
     assert field.description == "Create a user"
     assert field.deprecation_reason == "Is deprecated"
     assert field.type == NonNull(CreateUser)
 
 
+def test_mutation_default_args_output():
+    class CreateUser(Mutation):
+        """Description."""
+
+        class Arguments:
+            name = String()
+
+        name = String()
+
+        def mutate(self, info, name):
+            return CreateUser(name=name)
+
+    class MyMutation(ObjectType):
+        create_user = CreateUser.Field()
+
+    field = MyMutation._meta.fields["create_user"]
+    assert field.name is None
+    assert field.description == "Description."
+    assert field.deprecation_reason is None
+    assert field.type == CreateUser
+
+
 def test_mutation_as_subclass():
     class BaseCreateUser(Mutation):
         class Arguments: