Merge c8e71f3 into 53cd400

vladiate/test/test_validators.py

@@ -85,6 +85,7 @@ def test_set_validator_works(field_set, field):
     ([], 'bar'),
     (['foo'], 'bar'),
     (['foo', 'bar'], 'baz'),
+    ([str(x) for x in range(200)], "notanumber"),
 ])
 def test_set_validator_fails(field_set, field):
     validator = SetValidator(field_set)

vladiate/validators.py

@@ -1,4 +1,5 @@
 import re
+from itertools import islice
 
 from vladiate.exceptions import ValidationException, BadValidatorException
 
@@ -70,7 +71,8 @@ def validate(self, field, row={}):
         if field not in self.valid_set:
             self.invalid_set.add(field)
             raise ValidationException(
-                "'{}' is not in {}".format(field, self.valid_set))
+                "'{}' is not in {}".format(field,
+                                           stringify_set(self.valid_set, 100)))
 
     @property
     def bad(self):
@@ -208,3 +210,14 @@ def validate(self, field, row={}):
     @property
     def bad(self):
         pass
+
+
+def stringify_set(a_set, max_len):
+    ''' Stringify `max_len` elements of `a_set` and count the remainings '''
+    # Don't convert `a_set` to a list for performance reasons
+    text = "{{{}}}".format(", ".join(
+        "'{}'".format(value) for value in islice(a_set, max_len)
+    ))
+    if len(a_set) > max_len:
+        text += " ({} more suppressed)".format(len(a_set) - max_len)
+    return text