From ecd11ccc1e53d965e355742e9fef19bc9286522e Mon Sep 17 00:00:00 2001
From: Jonathan Kim <jkimbo@gmail.com>
Date: Mon, 29 Jun 2020 15:53:53 +0100
Subject: [PATCH] Revert 1213 update mutation docs (#1214)

* Revert "Update requirement for Query type in mutation docs (#1213)"

This reverts commit a9625dac0ed07d5fb35adc83cbc41387755f080f.

* Add test to check that Query type must be defined
---
 docs/types/mutations.rst            | 6 +++++-
 graphene/types/schema.py            | 2 +-
 graphene/types/tests/test_schema.py | 9 +++++++++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/docs/types/mutations.rst b/docs/types/mutations.rst
index 543f39b4..f8c76f35 100644
--- a/docs/types/mutations.rst
+++ b/docs/types/mutations.rst
@@ -48,7 +48,11 @@ So, we can finish our schema like this:
     class MyMutations(graphene.ObjectType):
         create_person = CreatePerson.Field()
 
-    schema = graphene.Schema(mutation=MyMutations)
+    # We must define a query for our schema
+    class Query(graphene.ObjectType):
+        person = graphene.Field(Person)
+
+    schema = graphene.Schema(query=Query, mutation=MyMutations)
 
 Executing the Mutation
 ----------------------
diff --git a/graphene/types/schema.py b/graphene/types/schema.py
index 0b6e9dac..29ead4a7 100644
--- a/graphene/types/schema.py
+++ b/graphene/types/schema.py
@@ -381,7 +381,7 @@ class Schema:
     questions about the types through introspection.
 
     Args:
-        query (Optional[Type[ObjectType]]): Root query *ObjectType*. Describes entry point for fields to *read*
+        query (Type[ObjectType]): Root query *ObjectType*. Describes entry point for fields to *read*
             data in your Schema.
         mutation (Optional[Type[ObjectType]]): Root mutation *ObjectType*. Describes entry point for
             fields to *create, update or delete* data in your API.
diff --git a/graphene/types/tests/test_schema.py b/graphene/types/tests/test_schema.py
index 7a1c299a..0c85e170 100644
--- a/graphene/types/tests/test_schema.py
+++ b/graphene/types/tests/test_schema.py
@@ -59,3 +59,12 @@ def test_schema_str():
 def test_schema_introspect():
     schema = Schema(Query)
     assert "__schema" in schema.introspect()
+
+
+def test_schema_requires_query_type():
+    schema = Schema()
+    result = schema.execute("query {}")
+
+    assert len(result.errors) == 1
+    error = result.errors[0]
+    assert error.message == "Query root type must be provided."