Fixed #28393 -- Added helpful error messages for invalid AutoField/FloatField/IntegerField values.

Co-authored-by: Diederik van der Boor <vdboor@edoburu.nl>
Co-authored-by: Nick Pope <nick.pope@flightdataservices.com>

django/db/models/fields/__init__.py

@@ -964,7 +964,12 @@ class AutoField(Field):
         value = super().get_prep_value(value)
         if value is None or isinstance(value, OuterRef):
             return value
+        try:
             return int(value)
+        except (TypeError, ValueError) as e:
+            raise e.__class__(
+                "Field '%s' expected a number but got %r." % (self.name, value),
+            ) from e
 
     def contribute_to_class(self, cls, name, **kwargs):
         assert not cls._meta.auto_field, "Model %s can't have more than one AutoField." % cls._meta.label
@@ -1745,7 +1750,12 @@ class FloatField(Field):
         value = super().get_prep_value(value)
         if value is None:
             return None
+        try:
             return float(value)
+        except (TypeError, ValueError) as e:
+            raise e.__class__(
+                "Field '%s' expected a number but got %r." % (self.name, value),
+            ) from e
 
     def get_internal_type(self):
         return "FloatField"
@@ -1827,7 +1837,12 @@ class IntegerField(Field):
         value = super().get_prep_value(value)
         if value is None:
             return None
+        try:
             return int(value)
+        except (TypeError, ValueError) as e:
+            raise e.__class__(
+                "Field '%s' expected a number but got %r." % (self.name, value),
+            ) from e
 
     def get_internal_type(self):
         return "IntegerField"

tests/model_fields/models.py

@@ -92,6 +92,18 @@ class UnicodeSlugField(models.Model):
     s = models.SlugField(max_length=255, allow_unicode=True)
 
 
+class AutoModel(models.Model):
+    value = models.AutoField(primary_key=True)
+
+
+class BigAutoModel(models.Model):
+    value = models.BigAutoField(primary_key=True)
+
+
+class SmallAutoModel(models.Model):
+    value = models.SmallAutoField(primary_key=True)
+
+
 class SmallIntegerModel(models.Model):
     value = models.SmallIntegerField()
 

tests/model_fields/test_autofield.py

@@ -0,0 +1,32 @@
+from django.test import TestCase
+
+from .models import AutoModel, BigAutoModel, SmallAutoModel
+
+
+class AutoFieldTests(TestCase):
+    model = AutoModel
+
+    def test_invalid_value(self):
+        tests = [
+            (TypeError, ()),
+            (TypeError, []),
+            (TypeError, {}),
+            (TypeError, set()),
+            (TypeError, object()),
+            (TypeError, complex()),
+            (ValueError, 'non-numeric string'),
+            (ValueError, b'non-numeric byte-string'),
+        ]
+        for exception, value in tests:
+            with self.subTest(value=value):
+                msg = "Field 'value' expected a number but got %r." % (value,)
+                with self.assertRaisesMessage(exception, msg):
+                    self.model.objects.create(value=value)
+
+
+class BigAutoFieldTests(AutoFieldTests):
+    model = BigAutoModel
+
+
+class SmallAutoFieldTests(AutoFieldTests):
+    model = SmallAutoModel

tests/model_fields/test_floatfield.py

@@ -31,3 +31,20 @@ class TestFloatField(TestCase):
         obj.size = obj
         with self.assertRaisesMessage(TypeError, msg):
             obj.save()
+
+    def test_invalid_value(self):
+        tests = [
+            (TypeError, ()),
+            (TypeError, []),
+            (TypeError, {}),
+            (TypeError, set()),
+            (TypeError, object()),
+            (TypeError, complex()),
+            (ValueError, 'non-numeric string'),
+            (ValueError, b'non-numeric byte-string'),
+        ]
+        for exception, value in tests:
+            with self.subTest(value):
+                msg = "Field 'size' expected a number but got %r." % (value,)
+                with self.assertRaisesMessage(exception, msg):
+                    FloatModel.objects.create(size=value)

tests/model_fields/test_integerfield.py

@@ -137,6 +137,23 @@ class IntegerFieldTests(TestCase):
         instance = self.model.objects.get(value='10')
         self.assertEqual(instance.value, 10)
 
+    def test_invalid_value(self):
+        tests = [
+            (TypeError, ()),
+            (TypeError, []),
+            (TypeError, {}),
+            (TypeError, set()),
+            (TypeError, object()),
+            (TypeError, complex()),
+            (ValueError, 'non-numeric string'),
+            (ValueError, b'non-numeric byte-string'),
+        ]
+        for exception, value in tests:
+            with self.subTest(value):
+                msg = "Field 'value' expected a number but got %r." % (value,)
+                with self.assertRaisesMessage(exception, msg):
+                    self.model.objects.create(value=value)
+
 
 class SmallIntegerFieldTests(IntegerFieldTests):
     model = SmallIntegerModel

tests/queries/tests.py

@@ -3853,7 +3853,7 @@ class TestTicket24279(TestCase):
 
 class TestInvalidValuesRelation(SimpleTestCase):
     def test_invalid_values(self):
-        msg = "invalid literal for int() with base 10: 'abc'"
+        msg = "Field 'id' expected a number but got 'abc'."
         with self.assertRaisesMessage(ValueError, msg):
             Annotation.objects.filter(tag='abc')
         with self.assertRaisesMessage(ValueError, msg):