From 6defe78137c0ec34c00abd025408c6602768043d Mon Sep 17 00:00:00 2001
From: Lukas Erlacher <erlacher@in.tum.de>
Date: Mon, 8 Jan 2018 16:22:00 +1100
Subject: [PATCH] Improve serializer bad relationship error

Fixes a possible string formatting error in the error clause
---
 sqlalchemy_jsonapi/serializer.py              | 14 +++++++---
 .../tests/test_collection_post.py             | 27 ++++++++++++++++++-
 2 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/sqlalchemy_jsonapi/serializer.py b/sqlalchemy_jsonapi/serializer.py
index 95d6b67..8379eac 100644
--- a/sqlalchemy_jsonapi/serializer.py
+++ b/sqlalchemy_jsonapi/serializer.py
@@ -47,6 +47,12 @@ class Permissions(Enum):
     EDIT = 102
     DELETE = 103
 
+class MissingKey:
+    def __init__(self, elem):
+        self.elem = elem
+
+    def __repr__(self):
+        return '<{} elem={}>'.format(self.__class__.__name__, self.elem)
 
 ALL_PERMISSIONS = {
     Permissions.VIEW, Permissions.CREATE, Permissions.EDIT, Permissions.DELETE
@@ -980,15 +986,15 @@ def post_collection(self, session, data, api_type):
         data['data'].setdefault('attributes', {})
 
         data_keys = set(map((
-            lambda x: resource.__jsonapi_map_to_py__.get(x, None)),
+            lambda x: resource.__jsonapi_map_to_py__.get(x, MissingKey(x))),
             data['data'].get('relationships', {}).keys()))
         model_keys = set(resource.__mapper__.relationships.keys())
         if not data_keys <= model_keys:
+            data_keys = set([key.elem if isinstance(key, MissingKey) else key for key in data_keys])
             # pragma: no cover
             raise BadRequestError(
-                '{} not relationships for {}'.format(
-                    ', '.join(list(data_keys -
-                                   model_keys)), model.__jsonapi_type__))
+                    '{} not relationships for {}'.format(
+                    ', '.join([repr(key) for key in list(data_keys - model_keys)]), model.__jsonapi_type__))
 
         attrs_to_ignore = {'__mapper__', 'id'}
 
diff --git a/sqlalchemy_jsonapi/tests/test_collection_post.py b/sqlalchemy_jsonapi/tests/test_collection_post.py
index e904fc5..bd76607 100644
--- a/sqlalchemy_jsonapi/tests/test_collection_post.py
+++ b/sqlalchemy_jsonapi/tests/test_collection_post.py
@@ -2,7 +2,7 @@
 
 from sqlalchemy_jsonapi.errors import (
     InvalidTypeForEndpointError, MissingTypeError, PermissionDeniedError,
-    ValidationError, MissingContentTypeError)
+    ValidationError, MissingContentTypeError, BadRequestError)
 from faker import Faker
 
 fake = Faker()
@@ -183,3 +183,28 @@ def test_409_for_wrong_field_name(client):
         '/api/users/', data=json.dumps(payload),
         content_type='application/vnd.api+json').validate(
         409, ValidationError)
+
+
+def test_400_for_unknown_relationship_type(user, client):
+    payload = {
+        'data': {
+            'type': 'blog-posts',
+            'attributes': {
+                'title': 'Some title',
+                'content': 'Hello, World!',
+                'is-published': True
+            },
+            'relationships': {
+                'bogon': {
+                    'data': {
+                        'type': 'users',
+                        'id': str(user.id)
+                    }
+                }
+            }
+        }
+    }
+    client.post(
+        '/api/blog-posts/', data=json.dumps(payload),
+        content_type='application/vnd.api+json').validate(
+        400, BadRequestError)