Added documentation for InputFields and InputObjectTypes usage

docs/types/mutations.rst

@@ -76,3 +76,69 @@ We should receive:
             "ok": true
         }
     }
+
+InputFields and InputObjectTypes
+----------------------
+InputFields are used in mutations to allow nested input data for mutations
+
+To use an InputField you define an InputObjectType that specifies the structure of your input data
+
+
+
+
+.. code:: python
+
+    import graphene
+
+    class PersonInput(graphene.InputObjectType):
+        name = graphene.String()
+        age = graphene.Int()
+
+    class CreatePerson(graphene.Mutation):
+        class Input:
+            person_data = graphene.InputField(PersonInput)
+
+        person = graphene.Field(lambda: Person)
+
+        def mutate(self, args, context, info):
+            p_data = args.get('person_data')
+
+            name = p_data.get('name')
+            age = p_data.get('age')
+
+            person = Person(name=name, age=age)
+            return CreatePerson(person=person)
+
+
+Note that  **name** and **age** are part of **person_data** now
+
+Using the above mutation your new query would look like this:
+
+.. code:: graphql
+
+    mutation myFirstMutation {
+        createPerson(personData: {name:"Peter", age: 24}) {
+            person {
+                name
+            }
+            ok
+        }
+    }
+
+InputObjectTypes can also be fields of InputObjectTypes allowing you to have
+as complex of input data as you need
+
+.. code:: python
+
+    import graphene
+
+    class LatLngInput(graphene.InputObjectType):
+        lat = graphene.Float()
+        lng = graphene.Float()
+
+    #A location has a latlng associated to it
+    class LocationInput(graphene.InputObjectType):
+        name = graphene.String()
+        latlng = graphene.InputField(LatLngInputType)
+
+