Fixed #10414 -- Made select_related() fail on invalid field names.

tests/select_related/models.py

@@ -10,6 +10,9 @@ the select-related behavior will traverse.
 from django.db import models
 from django.utils.encoding import python_2_unicode_compatible
 
+from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
+from django.contrib.contenttypes.models import ContentType
+
 # Who remembers high school biology?
 
 
@@ -94,3 +97,41 @@ class HybridSpecies(models.Model):
 
     def __str__(self):
         return self.name
+
+
+@python_2_unicode_compatible
+class Topping(models.Model):
+    name = models.CharField(max_length=30)
+
+    def __str__(self):
+        return self.name
+
+
+@python_2_unicode_compatible
+class Pizza(models.Model):
+    name = models.CharField(max_length=100)
+    toppings = models.ManyToManyField(Topping)
+
+    def __str__(self):
+        return self.name
+
+
+@python_2_unicode_compatible
+class TaggedItem(models.Model):
+    tag = models.CharField(max_length=30)
+
+    content_type = models.ForeignKey(ContentType, related_name='select_related_tagged_items')
+    object_id = models.PositiveIntegerField()
+    content_object = GenericForeignKey('content_type', 'object_id')
+
+    def __str__(self):
+        return self.tag
+
+
+@python_2_unicode_compatible
+class Bookmark(models.Model):
+    url = models.URLField()
+    tags = GenericRelation(TaggedItem)
+
+    def __str__(self):
+        return self.url

tests/select_related/tests.py

@@ -1,8 +1,12 @@
 from __future__ import unicode_literals
 
 from django.test import TestCase
+from django.core.exceptions import FieldError
 
-from .models import Domain, Kingdom, Phylum, Klass, Order, Family, Genus, Species, HybridSpecies
+from .models import (
+    Domain, Kingdom, Phylum, Klass, Order, Family, Genus, Species, HybridSpecies,
+    Pizza, TaggedItem, Bookmark,
+)
 
 
 class SelectRelatedTests(TestCase):
@@ -126,6 +130,12 @@ class SelectRelatedTests(TestCase):
             orders = [o.genus.family.order.name for o in world]
             self.assertEqual(orders, ['Agaricales'])
 
+    def test_single_related_field(self):
+        with self.assertNumQueries(1):
+            species = Species.objects.select_related('genus__name')
+            names = [s.genus.name for s in species]
+            self.assertEqual(sorted(names), ['Amanita', 'Drosophila', 'Homo', 'Pisum'])
+
     def test_field_traversal(self):
         with self.assertNumQueries(1):
             s = (Species.objects.all()
@@ -152,3 +162,47 @@ class SelectRelatedTests(TestCase):
             obj = queryset[0]
             self.assertEqual(obj.parent_1, parent_1)
             self.assertEqual(obj.parent_2, parent_2)
+
+
+class SelectRelatedValidationTests(TestCase):
+    """
+    select_related() should thrown an error on fields that do not exist and
+    non-relational fields.
+    """
+    non_relational_error = "Non-relational field given in select_related: '%s'. Choices are: %s"
+    invalid_error = "Invalid field name(s) given in select_related: '%s'. Choices are: %s"
+
+    def test_non_relational_field(self):
+        with self.assertRaisesMessage(FieldError, self.non_relational_error % ('name', 'genus')):
+            list(Species.objects.select_related('name__some_field'))
+
+        with self.assertRaisesMessage(FieldError, self.non_relational_error % ('name', 'genus')):
+            list(Species.objects.select_related('name'))
+
+        with self.assertRaisesMessage(FieldError, self.non_relational_error % ('name', '(none)')):
+            list(Domain.objects.select_related('name'))
+
+    def test_many_to_many_field(self):
+        with self.assertRaisesMessage(FieldError, self.invalid_error % ('toppings', '(none)')):
+            list(Pizza.objects.select_related('toppings'))
+
+    def test_reverse_relational_field(self):
+        with self.assertRaisesMessage(FieldError, self.invalid_error % ('child_1', 'genus')):
+            list(Species.objects.select_related('child_1'))
+
+    def test_invalid_field(self):
+        with self.assertRaisesMessage(FieldError, self.invalid_error % ('invalid_field', 'genus')):
+            list(Species.objects.select_related('invalid_field'))
+
+        with self.assertRaisesMessage(FieldError, self.invalid_error % ('related_invalid_field', 'family')):
+            list(Species.objects.select_related('genus__related_invalid_field'))
+
+        with self.assertRaisesMessage(FieldError, self.invalid_error % ('invalid_field', '(none)')):
+            list(Domain.objects.select_related('invalid_field'))
+
+    def test_generic_relations(self):
+        with self.assertRaisesMessage(FieldError, self.invalid_error % ('tags', '')):
+            list(Bookmark.objects.select_related('tags'))
+
+        with self.assertRaisesMessage(FieldError, self.invalid_error % ('content_object', 'content_type')):
+            list(TaggedItem.objects.select_related('content_object'))