Merge pull request #6 from pthegner/patch-2

Update boolean types

flask_restful/types.py

@@ -50,11 +50,24 @@ def natural(value):
 
 
 def boolean(value):
-    """Parse the string "true" or "false" as a boolean (case insensitive)"""
+    """Parse the string ``"true"`` or ``"false"`` as a boolean (case
+    insensitive). Also accepts ``"1"`` and ``"0"`` as ``True``/``False``
+    (respectively). If the input is from the request JSON body, the type is
+    already a native python boolean, and will be passed through without
+    further parsing.
+    """
+    if isinstance(value, bool):
+        return value
+
+    if isinstance(value, int):
+        return bool(value)
+
+    if not value:
+        raise ValueError("boolean type must be non-null")
     value = value.lower()
-    if value == 'true':
+    if value in ('true', '1'):
         return True
-    if value == 'false':
+    if value in ('false', '0'):
         return False
     raise ValueError("Invalid literal for boolean(): {}".format(value))