queryset-refactor: Fixed #6664. Calling list() no longer swallows field errors.

This is slightly backwards incompatible with previous behaviour if you were
doing Tricky Stuff(tm) -- the exception type has changed if you try to create a
bad queryset.


git-svn-id: http://code.djangoproject.com/svn/django/branches/queryset-refactor@7163 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/exceptions.py

@@ -27,3 +27,8 @@ class MiddlewareNotUsed(Exception):
 class ImproperlyConfigured(Exception):
     "Django is somehow improperly configured"
     pass
+
+class FieldError(Exception):
+    """Some kind of problem with a model field."""
+    pass
+

django/db/models/base.py

@@ -6,7 +6,7 @@ from itertools import izip
 import django.db.models.manipulators
 import django.db.models.manager
 from django.core import validators
-from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
+from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned, FieldError
 from django.db.models.fields import AutoField, ImageField, FieldDoesNotExist
 from django.db.models.fields.related import OneToOneRel, ManyToOneRel, OneToOneField
 from django.db.models.query import delete_objects, Q
@@ -101,7 +101,7 @@ class ModelBase(type):
                 names = [f.name for f in new_class._meta.local_fields + new_class._meta.many_to_many]
                 for field in base._meta.local_fields:
                     if field.name in names:
-                        raise TypeError('Local field %r in class %r clashes with field of similar name from abstract base class %r'
+                        raise FieldError('Local field %r in class %r clashes with field of similar name from abstract base class %r'
                                 % (field.name, name, base.__name__))
                     new_class.add_to_class(field.name, field)
 

django/db/models/sql/query.py

@@ -19,6 +19,7 @@ from django.db.models.sql.where import WhereNode, EverythingNode, AND, OR
 from django.db.models.sql.datastructures import Count, Date
 from django.db.models.fields import FieldDoesNotExist, Field, related
 from django.contrib.contenttypes import generic
+from django.core.exceptions import FieldError
 from datastructures import EmptyResultSet
 
 try:
@@ -548,7 +549,7 @@ class Query(object):
                 already_seen = {}
             join_tuple = tuple([tuple(j) for j in joins])
             if join_tuple in already_seen:
-                raise TypeError('Infinite loop caused by ordering.')
+                raise FieldError('Infinite loop caused by ordering.')
             already_seen[join_tuple] = True
 
             results = []
@@ -735,7 +736,7 @@ class Query(object):
         arg, value = filter_expr
         parts = arg.split(LOOKUP_SEP)
         if not parts:
-            raise TypeError("Cannot parse keyword query %r" % arg)
+            raise FieldError("Cannot parse keyword query %r" % arg)
 
         # Work out the lookup type and remove it from 'parts', if necessary.
         if len(parts) == 1 or parts[-1] not in self.query_terms:
@@ -867,7 +868,7 @@ class Query(object):
                 field, model, direct, m2m = opts.get_field_by_name(name)
             except FieldDoesNotExist:
                 names = opts.get_all_field_names()
-                raise TypeError("Cannot resolve keyword %r into field. "
+                raise FieldError("Cannot resolve keyword %r into field. "
                         "Choices are: %s" % (name, ", ".join(names)))
             if model:
                 # The field lives on a base class of the current model.
@@ -972,7 +973,7 @@ class Query(object):
                     joins.append([alias])
 
         if pos != len(names) - 1:
-            raise TypeError("Join on field %r not permitted." % name)
+            raise FieldError("Join on field %r not permitted." % name)
 
         return field, target, opts, joins
 
@@ -1033,7 +1034,7 @@ class Query(object):
             if not ORDER_PATTERN.match(item):
                 errors.append(item)
         if errors:
-            raise TypeError('Invalid order_by arguments: %s' % errors)
+            raise FieldError('Invalid order_by arguments: %s' % errors)
         if ordering:
             self.order_by.extend(ordering)
         else:
@@ -1228,7 +1229,7 @@ class UpdateQuery(Query):
                 for alias in alias_list:
                     if self.alias_map[alias][ALIAS_REFCOUNT]:
                         if table:
-                            raise TypeError('Updates can only access a single database table at a time.')
+                            raise FieldError('Updates can only access a single database table at a time.')
                         table = alias
         else:
             table = self.tables[0]
@@ -1271,7 +1272,7 @@ class UpdateQuery(Query):
             field, model, direct, m2m = self.model._meta.get_field_by_name(name)
             if not direct or m2m:
                 # Can only update non-relation fields and foreign keys.
-                raise TypeError('Cannot update model field %r (only non-relations and foreign keys permitted).' % field)
+                raise fieldError('Cannot update model field %r (only non-relations and foreign keys permitted).' % field)
             if field.rel and isinstance(val, Model):
                 val = val.pk
             self.values.append((field.column, val))

tests/modeltests/custom_columns/models.py

@@ -71,7 +71,7 @@ __test__ = {'API_TESTS':"""
 >>> Author.objects.filter(firstname__exact='John')
 Traceback (most recent call last):
     ...
-TypeError: Cannot resolve keyword 'firstname' into field. Choices are: article, first_name, id, last_name
+FieldError: Cannot resolve keyword 'firstname' into field. Choices are: article, first_name, id, last_name
 
 >>> a = Author.objects.get(last_name__exact='Smith')
 >>> a.first_name

tests/modeltests/field_subclassing/models.py

@@ -5,6 +5,7 @@ Tests for field subclassing.
 from django.db import models
 from django.utils.encoding import force_unicode
 from django.core import serializers
+from django.core.exceptions import FieldError
 
 class Small(object):
     """
@@ -50,7 +51,7 @@ class SmallField(models.Field):
             return [force_unicode(v) for v in value]
         if lookup_type == 'isnull':
             return []
-        raise TypeError('Invalid lookup type: %r' % lookup_type)
+        raise FieldError('Invalid lookup type: %r' % lookup_type)
 
     def flatten_data(self, follow, obj=None):
         return {self.attname: force_unicode(self._get_val_from_obj(obj))}
@@ -94,7 +95,7 @@ True
 >>> MyModel.objects.filter(data__lt=s)
 Traceback (most recent call last):
 ...
-TypeError: Invalid lookup type: 'lt'
+FieldError: Invalid lookup type: 'lt'
 
 # Serialization works, too.
 >>> stream = serializers.serialize("json", MyModel.objects.all())

tests/modeltests/lookup/models.py

@@ -270,12 +270,12 @@ DoesNotExist: Article matching query does not exist.
 >>> Article.objects.filter(pub_date_year='2005').count()
 Traceback (most recent call last):
     ...
-TypeError: Cannot resolve keyword 'pub_date_year' into field. Choices are: headline, id, pub_date
+FieldError: Cannot resolve keyword 'pub_date_year' into field. Choices are: headline, id, pub_date
 
 >>> Article.objects.filter(headline__starts='Article')
 Traceback (most recent call last):
     ...
-TypeError: Join on field 'headline' not permitted.
+FieldError: Join on field 'headline' not permitted.
 
 # Create some articles with a bit more interesting headlines for testing field lookups:
 >>> now = datetime.now()

tests/modeltests/many_to_one/models.py

@@ -179,13 +179,13 @@ False
 >>> Article.objects.filter(reporter_id__exact=1)
 Traceback (most recent call last):
     ...
-TypeError: Cannot resolve keyword 'reporter_id' into field. Choices are: headline, id, pub_date, reporter
+FieldError: Cannot resolve keyword 'reporter_id' into field. Choices are: headline, id, pub_date, reporter
 
 # You need to specify a comparison clause
 >>> Article.objects.filter(reporter_id=1)
 Traceback (most recent call last):
     ...
-TypeError: Cannot resolve keyword 'reporter_id' into field. Choices are: headline, id, pub_date, reporter
+FieldError: Cannot resolve keyword 'reporter_id' into field. Choices are: headline, id, pub_date, reporter
 
 # You can also instantiate an Article by passing
 # the Reporter's ID instead of a Reporter object.

tests/modeltests/model_inheritance/models.py

@@ -148,7 +148,7 @@ Test constructor for Restaurant.
 >>> Restaurant.objects.filter(supplier__name='foo')
 Traceback (most recent call last):
     ...
-TypeError: Cannot resolve keyword 'supplier' into field. Choices are: address, id, italianrestaurant, lot, name, place_ptr, provider, rating, serves_hot_dogs, serves_pizza
+FieldError: Cannot resolve keyword 'supplier' into field. Choices are: address, id, italianrestaurant, lot, name, place_ptr, provider, rating, serves_hot_dogs, serves_pizza
 
 # Parent fields can be used directly in filters on the child model.
 >>> Restaurant.objects.filter(name='Demon Dogs')

tests/modeltests/reverse_lookup/models.py

@@ -55,5 +55,5 @@ __test__ = {'API_TESTS':"""
 >>> Poll.objects.get(choice__name__exact="This is the answer")
 Traceback (most recent call last):
     ...
-TypeError: Cannot resolve keyword 'choice' into field. Choices are: creator, id, poll_choice, question, related_choice
+FieldError: Cannot resolve keyword 'choice' into field. Choices are: creator, id, poll_choice, question, related_choice
 """}

tests/regressiontests/null_queries/models.py

@@ -37,7 +37,7 @@ Excluding the previous result returns everything.
 >>> Choice.objects.filter(foo__exact=None)
 Traceback (most recent call last):
 ...
-TypeError: Cannot resolve keyword 'foo' into field. Choices are: choice, id, poll
+FieldError: Cannot resolve keyword 'foo' into field. Choices are: choice, id, poll
 
 # Can't use None on anything other than __exact
 >>> Choice.objects.filter(id__gt=None)

tests/regressiontests/queries/models.py

@@ -394,7 +394,7 @@ Bug #2076
 >>> LoopX.objects.all()
 Traceback (most recent call last):
 ...
-TypeError: Infinite loop caused by ordering.
+FieldError: Infinite loop caused by ordering.
 
 # If the remote model does not have a default ordering, we order by its 'id'
 # field.