From 4cc46736bf7297d3f927115daedd1c332c7a38ef Mon Sep 17 00:00:00 2001
From: Syrus Akbary <me@syrusakbary.com>
Date: Thu, 2 Mar 2017 17:54:15 -0800
Subject: [PATCH] Simplified DjangoFilterConnectionField logic

---
 graphene_django/fields.py        |  6 +++-
 graphene_django/filter/fields.py | 60 +++++++++-----------------------
 2 files changed, 22 insertions(+), 44 deletions(-)

diff --git a/graphene_django/fields.py b/graphene_django/fields.py
index e282ebe..6968866 100644
--- a/graphene_django/fields.py
+++ b/graphene_django/fields.py
@@ -32,9 +32,13 @@ class DjangoConnectionField(ConnectionField):
         self.on = kwargs.pop('on', False)
         super(DjangoConnectionField, self).__init__(*args, **kwargs)
 
+    @property
+    def node_type(self):
+        return self.type._meta.node
+
     @property
     def model(self):
-        return self.type._meta.node._meta.model
+        return self.node_type._meta.model
 
     def get_manager(self):
         if self.on:
diff --git a/graphene_django/filter/fields.py b/graphene_django/filter/fields.py
index c6425b8..363e1d9 100644
--- a/graphene_django/filter/fields.py
+++ b/graphene_django/filter/fields.py
@@ -1,11 +1,9 @@
-import inspect
-
 from collections import OrderedDict
 from functools import partial
 
+# from graphene.relay import is_node
 from graphene.types.argument import to_arguments
 from ..fields import DjangoConnectionField
-from graphene.relay import is_node
 from .utils import get_filtering_args_from_filterset, get_filterset_class
 
 
@@ -15,47 +13,12 @@ class DjangoFilterConnectionField(DjangoConnectionField):
                  extra_filter_meta=None, filterset_class=None,
                  *args, **kwargs):
         self._fields = fields
-        self._type = type
-        self._filterset_class = filterset_class
+        self._provided_filterset_class = filterset_class
+        self._filterset_class = None
         self._extra_filter_meta = extra_filter_meta
         self._base_args = None
         super(DjangoFilterConnectionField, self).__init__(type, *args, **kwargs)
 
-    @property
-    def node_type(self):
-        if inspect.isfunction(self._type) or inspect.ismethod(self._type):
-            return self._type()
-        return self._type
-
-    @property
-    def meta(self):
-        if is_node(self.node_type):
-            _model = self.node_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.
-            _model = self.node_type._meta.node._meta.model
-
-        meta = dict(model=_model,
-                    fields=self.fields)
-        if self._extra_filter_meta:
-            meta.update(self._extra_filter_meta)
-        return meta
-
-    @property
-    def fields(self):
-        if self._fields:
-            return self._fields
-
-        if is_node(self.node_type):
-            return self.node_type._meta.filter_fields
-        else:
-            # ConnectionFields can also be passed Connections,
-            # in which case, we need to use the Node of the connection
-            # to get our relevant args.
-            return self.node_type._meta.node._meta.filter_fields
-
     @property
     def args(self):
         return to_arguments(self._base_args or OrderedDict(), self.filtering_args)
@@ -66,7 +29,16 @@ class DjangoFilterConnectionField(DjangoConnectionField):
 
     @property
     def filterset_class(self):
-        return get_filterset_class(self._filterset_class, **self.meta)
+        if not self._filterset_class:
+            fields = self._fields or self.node_type._meta.filter_fields
+            meta = dict(model=self.model,
+                        fields=fields)
+            if self._extra_filter_meta:
+                meta.update(self._extra_filter_meta)
+
+            self._filterset_class = get_filterset_class(self._provided_filterset_class, **meta)
+
+        return self._filterset_class
 
     @property
     def filtering_args(self):
@@ -76,8 +48,10 @@ class DjangoFilterConnectionField(DjangoConnectionField):
     def connection_resolver(resolver, connection, default_manager, filterset_class, filtering_args,
                             root, args, context, info):
         filter_kwargs = {k: v for k, v in args.items() if k in filtering_args}
-        qs = default_manager.get_queryset()
-        qs = filterset_class(data=filter_kwargs, queryset=qs).qs
+        qs = filterset_class(
+            data=filter_kwargs,
+            queryset=default_manager.get_queryset()
+        ).qs
         return DjangoConnectionField.connection_resolver(resolver, connection, qs, root, args, context, info)
 
     def get_resolver(self, parent_resolver):