Form error

pilo/fields.py

@@ -79,6 +79,29 @@ def field1(self, value):
 ]
 
 
+class FormError(ValueError):
+
+    def __init__(self, *field_errors):
+        self.field_errors = field_errors
+        super(FormError, self).__init__(self.message)
+
+    def __str__(self):
+        return self.message
+
+    def __repr__(self):
+        return 'FormError({0})'.format(
+            ', '.join(exc.__class__.__name__ for exc in self.field_errors)
+        )
+
+    @property
+    def message(self):
+        msg = '\n* '.join(
+            '{0}: {1}'.format(exc.__class__.__name__, str(exc))
+            for exc in self.field_errors
+        )
+        return '\n* {0}\n'.format(msg)
+
+
 class FieldError(ValueError):
 
     def __init__(self, message, field):
@@ -118,9 +141,12 @@ def invalid(self, violation):
 
 class RaiseErrors(list, Errors):
 
-    def __call__(self, *ex):
-        self.extend(ex)
-        raise ex[0]
+    def __call__(self, *excs):
+        self.extend(excs)
+        field_errors = [e for e in self if isinstance(e, FieldError)]
+        if field_errors:
+            raise FormError(*field_errors)
+        raise self[0]
 
 
 class CollectErrors(list, Errors):
@@ -137,7 +163,7 @@ class CreatedCountMixin(object):
 
     _created_count = 0
 
-    def  __init__(self):
+    def __init__(self):
         CreatedCountMixin._created_count += 1
         self._count = CreatedCountMixin._created_count
 
@@ -1541,7 +1567,7 @@ def __init__(self, *args, **kwargs):
         if src:
             errors = self.map(src)
             if errors:
-                raise errors[0]
+                RaiseErrors()(*errors)
 
     def _map_source(self, obj):
         return DefaultSource(obj)
@@ -1638,7 +1664,7 @@ def map(self, src=None, tags=None, reset=False, unmapped='ignore', error='collec
         if error == 'collect':
             return errors
         if errors:
-            raise errors[0]
+            RaiseErrors()(*errors)
         return self
 
     def has(self, field):

tests/test_fields.py

@@ -3,6 +3,7 @@
 import re
 
 import pilo
+from pilo.fields import Integer, List, String, SubForm
 
 from tests import TestCase
 
@@ -374,3 +375,143 @@ def send_to_zoo(self):
             ]:
             obj = Animal.type.cast(desc)(desc)
             self.assertIsInstance(obj, cls)
+
+
+class TestFormExceptions(TestCase):
+
+    def test_exceptions(self):
+
+        class DatingProfile(pilo.Form):
+
+            genders = ['male', 'female', 'neutral']
+
+            name = String()
+            email = String()
+            postal_code = String(length=5)
+            blurb = String(max_length=100)
+            gender = String(choices=genders)
+            sexual_preferences = List(String(choices=genders))
+            likes = List(String())
+
+        profile_with_one_error = dict(
+            name='William Henry Cavendish III',
+            email='whc@example.org',
+            postal_code='9021',  # Invalid length
+            blurb='I am a test fixture',
+            gender='male',
+            sexual_preferences=['female', 'neutral'],
+            likes=['croquet', 'muesli', 'ruses', 'umbrellas', 'wenches'],
+        )
+        profile_with_two_errors = dict(
+            name='William Henry Cavendish III',
+            email='whc@example.org',
+            postal_code='9021',  # Invalid postal code
+            blurb='I am a test fixture',
+            gender='male',
+            sexual_preferences=['female', 'neutral'],
+            # Likes parameter missing
+        )
+        profile_with_three_errors = dict(
+            name='William Henry Cavendish III',
+            email='whc@example.org',
+            postal_code='9021',  # Invalid length
+            blurb='I am a test fixture',
+            gender='male',
+            sexual_preferences=['alien'],  # Invalid preference
+            # likes is missing
+        )
+
+        with self.assertRaises(pilo.fields.FormError) as ctx:
+            DatingProfile(profile_with_one_error)
+
+        self.assertEquals(
+            ctx.exception.message,
+            '\n'
+            '* Invalid: postal_code - "9021" must have length >= 5'
+            '\n'
+        )
+        with self.assertRaises(pilo.fields.FormError) as ctx:
+            DatingProfile(profile_with_two_errors)
+
+        self.assertEquals(
+            ctx.exception.message,
+            '\n'
+            '* Invalid: postal_code - "9021" must have length >= 5'
+            '\n'
+            '* Missing: likes - missing'
+            '\n'
+        )
+        with self.assertRaises(pilo.fields.FormError) as ctx:
+            DatingProfile(profile_with_three_errors)
+
+        self.assertEquals(
+            ctx.exception.message,
+            '\n'
+            '* Invalid: postal_code - "9021" must have length >= 5'
+            '\n'
+            '* Invalid: sexual_preferences[0] - "alien" is not one of "male", '
+            '"female", "neutral"'
+            '\n'
+            '* Missing: likes - missing'
+            '\n'
+        )
+
+    def test_exceptions_in_nested_forms(self):
+
+        class DatingProfile(pilo.Form):
+
+            genders = ['male', 'female', 'neutral']
+
+            name = String()
+            email = String()
+            postal_code = String(length=5)
+            blurb = String(max_length=100)
+            gender = String(choices=genders)
+            sexual_preferences = List(String(choices=genders))
+            likes = List(String())
+
+        class Matches(pilo.Form):
+
+            similarity = Integer()
+            candidates = List(SubForm(DatingProfile))
+
+        with self.assertRaises(pilo.fields.FormError) as ctx:
+            Matches(
+                similarity="Not an integer",
+                candidates=[
+                    dict(
+                        name='William Henry Cavendish III',
+                        email='whc@example.org',
+                        postal_code='9021',  # Invalid postal code
+                        blurb='I am a test fixture',
+                        gender='male',
+                        sexual_preferences=['female', 'neutral'],
+                        # Likes parameter missing
+                    ),
+                    dict(),
+                    ]
+            )
+        self.assertEquals(
+            ctx.exception.message,
+            '\n'
+            '* Invalid: similarity - "Not an integer" is not an integer'
+            '\n'
+            '* Invalid: candidates[0].postal_code - "9021" must have length >= 5'
+            '\n'
+            '* Missing: candidates[0].likes - missing'
+            '\n'
+            '* Missing: candidates[1].name - missing'
+            '\n'
+            '* Missing: candidates[1].email - missing'
+            '\n'
+            '* Missing: candidates[1].postal_code - missing'
+            '\n'
+            '* Missing: candidates[1].blurb - missing'
+            '\n'
+            '* Missing: candidates[1].gender - missing'
+            '\n'
+            '* Missing: candidates[1].sexual_preferences - missing'
+            '\n'
+            '* Missing: candidates[1].likes - missing'
+            '\n'
+        )