added a test and made the type property better

Author: tangerilli

graphene_django/filter/fields.py

@@ -1,3 +1,5 @@
+import inspect
+
 from collections import OrderedDict
 from functools import partial
 
@@ -21,7 +23,7 @@ def __init__(self, type, fields=None, order_by=None,
 
     @property
     def node_type(self):
-        if callable(self._type):
+        if inspect.isfunction(self._type) or inspect.ismethod(self._type):
             return self._type()
         return self._type
 

graphene_django/filter/tests/test_fields.py

@@ -350,3 +350,20 @@ class Query(ObjectType):
     assert not result.errors
     # We should only get two reporters
     assert len(result.data['allReporters']['edges']) == 2
+
+
+def test_recursive_filter_connection():
+    class ReporterFilterNode(DjangoObjectType):
+        child_reporters = DjangoFilterConnectionField(lambda: ReporterFilterNode)
+
+        def resolve_child_reporters(self, args, context, info):
+            return []
+
+        class Meta:
+            model = Reporter
+            interfaces = (Node, )
+
+    class Query(ObjectType):
+        all_reporters = DjangoFilterConnectionField(ReporterFilterNode)
+
+    assert ReporterFilterNode._meta.fields['child_reporters'].node_type == ReporterFilterNode