diff --git a/examples/starwars/schema.py b/examples/starwars/schema.py
index 288e4e3f..3f1c6ebf 100644
--- a/examples/starwars/schema.py
+++ b/examples/starwars/schema.py
@@ -22,7 +22,6 @@ class Human(graphene.ObjectType):
     home_planet = graphene.String()
 
     def resolve_friends(self, args, *_):
-        print 'resolve_friends'
         # The character friends is a list of strings
         return [get_character(f) for f in self.friends]
 
@@ -32,10 +31,8 @@ class Droid(graphene.ObjectType):
     primary_function = graphene.String()
 
     def resolve_friends(self, args, *_):
-        print 'resolve_friends'
-        # print self.name
         # The character friends is a list of strings
-        return [get_character() for f in self.friends]
+        return [get_character(f) for f in self.friends]
 
 
 class Query(graphene.ObjectType):
@@ -51,7 +48,6 @@ class Query(graphene.ObjectType):
 
     @resolve_only_args
     def resolve_hero(self, episode=None):
-        print 'get_hero', get_hero(episode)
         return get_hero(episode)
 
     @resolve_only_args
diff --git a/graphene/types/definitions.py b/graphene/types/definitions.py
index 37b94604..96d97a61 100644
--- a/graphene/types/definitions.py
+++ b/graphene/types/definitions.py
@@ -152,7 +152,7 @@ class GrapheneObjectType(GrapheneFieldsType, GraphQLObjectType):
         from ..utils.get_graphql_type import get_graphql_type
         try:
             graphql_type = get_graphql_type(type(interface))
-            return graphql_type == self or graphql_type in self._provided_interfaces
+            return graphql_type == self
         except:
             return False
 
diff --git a/graphene/types/field.py b/graphene/types/field.py
index ac02b37a..37e564f2 100644
--- a/graphene/types/field.py
+++ b/graphene/types/field.py
@@ -60,18 +60,40 @@ class Field(GraphQLField, OrderedType):
     def type(self, type):
         self._type = type
 
-    @property
-    def args(self):
-        return self._args
-
-    @args.setter
-    def args(self, args):
-        self._args = args
-
     @property
     def resolver(self):
-        return self._resolver or getattr(self.parent(), 'resolve_{}'.format(self.attname), None)
+        def default_resolver(root, args, context, info):
+            return getattr(root, self.source or self.attname, None)
+
+        resolver = getattr(self.parent, 'resolve_{}'.format(self.attname), default_resolver)
+
+        def resolver_wrapper(root, *args, **kwargs):
+            if not isinstance(root, self.parent):
+                root = self.parent()
+            return resolver(root, *args, **kwargs)
+
+        return self._resolver or resolver_wrapper
 
     @resolver.setter
     def resolver(self, resolver):
         self._resolver = resolver
+
+    def __copy__(self):
+        field = Field(
+            type=self._type,
+            args=self.args,
+            resolver=self._resolver,
+            source=self.source,
+            deprecation_reason=self.deprecation_reason,
+            name=self._name,
+            description=self.description,
+            _creation_counter=self.creation_counter,
+        )
+        field.attname = self.attname
+        field.parent = self.parent
+        return field
+
+    def __str__(self):
+        if not self.parent:
+            return 'Not bounded field'
+        return "{}.{}".format(self.parent._meta.graphql_type, self.attname)