Fixed unicode string error when accessing cursor data

Author: syrusakbary

graphql_relay/connection/arrayconnection.py

@@ -1,6 +1,6 @@
 from promise import Promise
 
-from ..utils import base64, unbase64
+from ..utils import base64, unbase64, is_str
 from .connectiontypes import Connection, PageInfo, Edge
 
 
@@ -148,7 +148,7 @@ def get_offset_with_default(cursor=None, default_offset=0):
     to use; if the cursor contains a valid offset, that will be used,
     otherwise it will be the default.
     '''
-    if not isinstance(cursor, str):
+    if not is_str(cursor):
         return default_offset
 
     offset = cursor_to_offset(cursor)

graphql_relay/utils.py

@@ -4,13 +4,20 @@
     str_type = basestring
     base64 = _base64
     unbase64 = _unbase64
+
+    def is_str(s):
+        return isinstance(s, basestring)
+
 except NameError:
     def base64(s):
         return _base64(bytes(s, 'utf-8')).decode('utf-8')
 
     def unbase64(s):
         return _unbase64(s).decode('utf-8')
 
+    def is_str(s):
+        return isinstance(s, str)
+
 
 def resolve_maybe_thunk(f):
     if callable(f):