Set clientMutationId to be camelCase as defined by the graphql relay specification. Fixed #86

Author: syrusakbary

graphene/relay/tests/test_mutations.py

@@ -37,7 +37,7 @@ def test_mutation_arguments():
     assert 'input' in schema.T(ChangeNumber.arguments)
     inner_type = ChangeNumber.input_type
     client_mutation_id_field = inner_type._meta.fields_map[
-        'client_mutation_id']
+        'clientMutationId']
     assert issubclass(inner_type, graphene.InputObjectType)
     assert isinstance(client_mutation_id_field.type, graphene.NonNull)
     assert isinstance(client_mutation_id_field.type.of_type, graphene.String)

graphene/relay/types.py

@@ -142,7 +142,7 @@ def get_edge_type(cls):
 
 
 class MutationInputType(InputObjectType):
-    client_mutation_id = String(required=True)
+    clientMutationId = String(required=True)
 
 
 class RelayMutationMeta(MutationMeta):
@@ -162,7 +162,7 @@ def construct_arguments(cls, items):
 
 
 class ClientIDMutation(six.with_metaclass(RelayMutationMeta, Mutation)):
-    client_mutation_id = String(required=True)
+    clientMutationId = String(required=True)
 
     class Meta:
         abstract = True
@@ -171,6 +171,6 @@ class Meta:
     def mutate(cls, instance, args, info):
         input = args.get('input')
         payload = cls.mutate_and_get_payload(input, info)
-        client_mutation_id = input.get('client_mutation_id')
-        setattr(payload, 'client_mutation_id', client_mutation_id)
+        client_mutation_id = input.get('clientMutationId') or input.get('client_mutation_id')
+        setattr(payload, 'clientMutationId', client_mutation_id)
         return payload