Merge pull request #10 from IAmNatch/feature-convert-clusterTaggableM…

…anager

add conversion for ClusterTaggableManager

wagtail_graphql/types/core.py

@@ -13,7 +13,8 @@
 from graphene_django.converter import convert_django_field, String, List
 # wagtail
 from wagtail.core.models import Page as wagtailPage, Site as wagtailSite
-from taggit.managers import TaggableManager
+from taggit.managers import TaggableManager, 
+from modelcluster.tags import ClusterTaggableManager
 from wagtail.core.utils import camelcase_to_underscore
 # app
 from ..settings import url_prefix_for_site, RELAY
@@ -90,6 +91,22 @@ def resolve_children(self, info: ResolveInfo, **_kwargs):
         ).live().order_by('path').all()
 
 
+# https://jossingram.wordpress.com/2018/04/19/wagtail-and-graphql/
+class FlatTags(graphene.String):
+
+    @classmethod
+    def serialize(cls, value):
+        tagsList = []
+        for tag in value.all():
+            tagsList.append(tag.name)
+        return tagsList
+
+@convert_django_field.register(ClusterTaggableManager)
+def convert_tag_field_to_string(field, registry=None):
+    return graphene.Field(FlatTags,
+        description=field.help_text,
+        required=not field.null)
+
 @convert_django_field.register(TaggableManager)
 def convert_field_to_string(field, _registry=None):
     return List(String, description=field.help_text, required=not field.null)