accept connections for DjangoFilterConnectionField

graphene_django/filter/fields.py

@@ -1,6 +1,7 @@
 from functools import partial
 
 from ..fields import DjangoConnectionField
+from graphene.relay import is_node
 from .utils import get_filtering_args_from_filterset, get_filterset_class
 
 
@@ -9,9 +10,18 @@ class DjangoFilterConnectionField(DjangoConnectionField):
     def __init__(self, type, fields=None, extra_filter_meta=None,
                  filterset_class=None, *args, **kwargs):
 
-        self.fields = fields or type._meta.filter_fields
-        meta = dict(model=type._meta.model,
-                    fields=self.fields)
+        if is_node(type):
+            _fields = type._meta.filter_fields
+            _model = type._meta.model
+        else:
+            # ConnectionFields can also be passed Connections,
+            # in which case, we need to use the Node of the connection
+            # to get our relevant args.
+            _fields = type._meta.node._meta.filter_fields
+            _model = type._meta.node._meta.model
+
+        self.fields = fields or _fields
+        meta = dict(model=_model, fields=self.fields)
         if extra_filter_meta:
             meta.update(extra_filter_meta)
         self.filterset_class = get_filterset_class(filterset_class, **meta)