From 3ba9af1ce78266e2a9ce9ff845a4a4a148551838 Mon Sep 17 00:00:00 2001
From: Pawel Kowalski <pawel.kowalski@iterativ.ch>
Date: Wed, 15 Aug 2018 14:45:18 +0200
Subject: [PATCH] Add StreamField serializer

---
 client/src/graphql/gql/moduleDetailsQuery.gql |  1 +
 server/api/graphene_wagtail.py                | 19 +++++++++++++++++++
 server/api/schema.py                          |  1 +
 server/book/schema.py                         |  2 +-
 4 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 server/api/graphene_wagtail.py

diff --git a/client/src/graphql/gql/moduleDetailsQuery.gql b/client/src/graphql/gql/moduleDetailsQuery.gql
index b2107912..6c0b4c40 100644
--- a/client/src/graphql/gql/moduleDetailsQuery.gql
+++ b/client/src/graphql/gql/moduleDetailsQuery.gql
@@ -35,6 +35,7 @@ query ModulesQuery($slug: String!) {
                     slug
                     title
                     type
+                    contents
                   }
                 }
               }
diff --git a/server/api/graphene_wagtail.py b/server/api/graphene_wagtail.py
new file mode 100644
index 00000000..d283b851
--- /dev/null
+++ b/server/api/graphene_wagtail.py
@@ -0,0 +1,19 @@
+# mysite/api/graphene_wagtail.py
+# Taken from https://github.com/patrick91/wagtail-ql/blob/master/backend/graphene_utils/converter.py and slightly adjusted
+
+from graphene.types import Scalar
+from graphene_django.converter import convert_django_field
+from wagtail.core.fields import StreamField
+
+
+class GenericStreamFieldType(Scalar):
+    @staticmethod
+    def serialize(stream_value):
+        return stream_value.stream_data
+
+
+@convert_django_field.register(StreamField)
+def convert_stream_field(field, registry=None):
+    return GenericStreamFieldType(
+        description=field.help_text, required=not field.null
+    )
diff --git a/server/api/schema.py b/server/api/schema.py
index b2222e7d..ef6b9860 100644
--- a/server/api/schema.py
+++ b/server/api/schema.py
@@ -1,6 +1,7 @@
 import graphene
 from django.conf import settings
 from graphene_django.debug import DjangoDebug
+from api import graphene_wagtail
 
 from book.schema import BookQuery
 from objectives.schema import ObjectivesQuery
diff --git a/server/book/schema.py b/server/book/schema.py
index f4ced477..eeb22cc3 100644
--- a/server/book/schema.py
+++ b/server/book/schema.py
@@ -10,7 +10,7 @@ class ContentBlockNode(DjangoObjectType):
     class Meta:
         model = ContentBlock
         only_fields = [
-            'slug', 'title', 'type'
+            'slug', 'title', 'type', 'contents'
         ]
         filter_fields = [
             'slug', 'title',