fix int_range input

flask_restful/inputs.py

@@ -215,15 +215,21 @@ def positive(value, argument='argument'):
     return value
 
 
-def int_range(low, high, value, argument='argument'):
+class int_range(object):
     """ Restrict input to an integer in a range (inclusive) """
-    value = _get_integer(value)
-    if value < low or value > high:
-        error = ('Invalid {arg}: {val}. {arg} must be within the range {lo} - {hi}'
-                 .format(arg=argument, val=value, lo=low, hi=high))
-        raise ValueError(error)
+    def __init__(self, low, high, argument='argument'):
+        self.low = low
+        self.high = high
+        self.argument = argument
 
-    return value
+    def __call__(self, value):
+        value = _get_integer(value)
+        if value < self.low or value > self.high:
+            error = ('Invalid {arg}: {val}. {arg} must be within the range {lo} - {hi}'
+                     .format(arg=self.argument, val=value, lo=self.low, hi=self.high))
+            raise ValueError(error)
+
+        return value
 
 
 def boolean(value):

tests/test_inputs.py

@@ -199,16 +199,20 @@ def test_positive_negative_input(self):
         assert_raises(ValueError, lambda: inputs.positive(-1))
 
     def test_int_range_good(self):
-        assert_equal(3, inputs.int_range(1, 5, 3, 'my_arg'))
+        int_range = inputs.int_range(1, 5)
+        assert_equal(3, int_range(3))
 
     def test_int_range_inclusive(self):
-        assert_equal(5, inputs.int_range(1, 5, 5, 'my_arg'))
+        int_range = inputs.int_range(1, 5)
+        assert_equal(5, int_range(5))
 
     def test_int_range_low(self):
-        assert_raises(ValueError, lambda: inputs.int_range(0, 5, -1, 'my_arg'))
+        int_range = inputs.int_range(0, 5)
+        assert_raises(ValueError, lambda: int_range(-1))
 
     def test_int_range_high(self):
-        assert_raises(ValueError, lambda: inputs.int_range(0, 5, 6, 'my_arg'))
+        int_range = inputs.int_range(0, 5)
+        assert_raises(ValueError, lambda: int_range(6))
 
 
 def test_isointerval():