Fixed #14951 -- Made the unique_for_{date,month,year} model field constraints to not fail when the related DateField is empty.

Existing modelforms tests were extended to cover this case and an equivalent set of tests was added for the model functionality.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15167 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/base.py

@@ -648,7 +648,7 @@ class Model(object):
         called from a ModelForm, some fields may have been excluded; we can't
         perform a unique check on a model that is missing fields involved
         in that check.
-        Fields that did not validate should also be exluded, but they need
+        Fields that did not validate should also be excluded, but they need
         to be passed in via the exclude argument.
         """
         if exclude is None:
@@ -740,6 +740,8 @@ class Model(object):
             # there's a ticket to add a date lookup, we can remove this special
             # case if that makes it's way in
             date = getattr(self, unique_for)
+            if date is None:
+                continue
             if lookup_type == 'date':
                 lookup_kwargs['%s__day' % unique_for] = date.day
                 lookup_kwargs['%s__month' % unique_for] = date.month

tests/modeltests/model_forms/mforms.py

@@ -1,7 +1,8 @@
 from django import forms
 from django.forms import ModelForm
 
-from models import Product, Price, Book, DerivedBook, ExplicitPK, Post, DerivedPost, Writer
+from models import (Product, Price, Book, DerivedBook, ExplicitPK, Post,
+        DerivedPost, Writer, FlexibleDatePost)
 
 class ProductForm(ModelForm):
     class Meta:
@@ -37,3 +38,7 @@ class CustomWriterForm(ModelForm):
 
    class Meta:
        model = Writer
+
+class FlexDatePostForm(ModelForm):
+    class Meta:
+        model = FlexibleDatePost

tests/modeltests/model_forms/models.py

@@ -236,6 +236,12 @@ class CustomFieldForExclusionModel(models.Model):
     name = models.CharField(max_length=10)
     markup = MarkupField()
 
+class FlexibleDatePost(models.Model):
+    title = models.CharField(max_length=50, unique_for_date='posted', blank=True)
+    slug = models.CharField(max_length=50, unique_for_year='posted', blank=True)
+    subtitle = models.CharField(max_length=50, unique_for_month='posted', blank=True)
+    posted = models.DateField(blank=True, null=True)
+
 __test__ = {'API_TESTS': """
 >>> from django import forms
 >>> from django.forms.models import ModelForm, model_to_dict

tests/modeltests/model_forms/tests.py

@@ -1,9 +1,10 @@
 import datetime
 from django.test import TestCase
 from django import forms
-from models import Category, Writer, Book, DerivedBook, Post
+from models import Category, Writer, Book, DerivedBook, Post, FlexibleDatePost
 from mforms import (ProductForm, PriceForm, BookForm, DerivedBookForm,
-                   ExplicitPKForm, PostForm, DerivedPostForm, CustomWriterForm)
+                   ExplicitPKForm, PostForm, DerivedPostForm, CustomWriterForm,
+                   FlexDatePostForm)
 
 
 class IncompleteCategoryFormWithFields(forms.ModelForm):
@@ -183,3 +184,16 @@ class UniqueTest(TestCase):
             "slug": "Django 1.0", 'posted': '2008-09-03'}, instance=p)
         self.assertTrue(form.is_valid())
 
+    def test_unique_for_date_with_nullable_date(self):
+        p = FlexibleDatePost.objects.create(title="Django 1.0 is released",
+            slug="Django 1.0", subtitle="Finally", posted=datetime.date(2008, 9, 3))
+
+        form = FlexDatePostForm({'title': "Django 1.0 is released"})
+        self.assertTrue(form.is_valid())
+        form = FlexDatePostForm({'slug': "Django 1.0"})
+        self.assertTrue(form.is_valid())
+        form = FlexDatePostForm({'subtitle': "Finally"})
+        self.assertTrue(form.is_valid())
+        form = FlexDatePostForm({'subtitle': "Finally", "title": "Django 1.0 is released",
+            "slug": "Django 1.0"}, instance=p)
+        self.assertTrue(form.is_valid())

tests/modeltests/validation/models.py

@@ -63,3 +63,18 @@ class Article(models.Model):
     def clean(self):
         if self.pub_date is None:
             self.pub_date = datetime.now()
+
+class Post(models.Model):
+    title = models.CharField(max_length=50, unique_for_date='posted', blank=True)
+    slug = models.CharField(max_length=50, unique_for_year='posted', blank=True)
+    subtitle = models.CharField(max_length=50, unique_for_month='posted', blank=True)
+    posted = models.DateField()
+
+    def __unicode__(self):
+        return self.name
+
+class FlexibleDatePost(models.Model):
+    title = models.CharField(max_length=50, unique_for_date='posted', blank=True)
+    slug = models.CharField(max_length=50, unique_for_year='posted', blank=True)
+    subtitle = models.CharField(max_length=50, unique_for_month='posted', blank=True)
+    posted = models.DateField(blank=True, null=True)

tests/modeltests/validation/test_unique.py

@@ -1,12 +1,13 @@
 import datetime
 
 from django.conf import settings
+from django.core.exceptions import ValidationError
 from django.db import connection
 from django.test import TestCase
 from django.utils import unittest
 
 from models import (CustomPKModel, UniqueTogetherModel, UniqueFieldsModel,
-    UniqueForDateModel, ModelToValidate)
+    UniqueForDateModel, ModelToValidate, Post, FlexibleDatePost)
 
 
 class GetUniqueCheckTests(unittest.TestCase):
@@ -76,3 +77,75 @@ class PerformUniqueChecksTest(TestCase):
             mtv = ModelToValidate(number=10, name='Some Name')
             mtv.full_clean()
         self.assertNumQueries(0, test)
+
+    def test_unique_for_date(self):
+        p1 = Post.objects.create(title="Django 1.0 is released",
+            slug="Django 1.0", subtitle="Finally", posted=datetime.date(2008, 9, 3))
+
+        p = Post(title="Django 1.0 is released", posted=datetime.date(2008, 9, 3))
+        try:
+            p.full_clean()
+        except ValidationError, e:
+            self.assertEqual(e.message_dict, {'title': [u'Title must be unique for Posted date.']})
+        else:
+            self.fail('unique_for_date checks should catch this.')
+
+        # Should work without errors
+        p = Post(title="Work on Django 1.1 begins", posted=datetime.date(2008, 9, 3))
+        p.full_clean()
+
+        # Should work without errors
+        p = Post(title="Django 1.0 is released", posted=datetime.datetime(2008, 9,4))
+        p.full_clean()
+
+        p = Post(slug="Django 1.0", posted=datetime.datetime(2008, 1, 1))
+        try:
+            p.full_clean()
+        except ValidationError, e:
+            self.assertEqual(e.message_dict, {'slug': [u'Slug must be unique for Posted year.']})
+        else:
+            self.fail('unique_for_year checks should catch this.')
+
+        p = Post(subtitle="Finally", posted=datetime.datetime(2008, 9, 30))
+        try:
+            p.full_clean()
+        except ValidationError, e:
+            self.assertEqual(e.message_dict, {'subtitle': [u'Subtitle must be unique for Posted month.']})
+        else:
+            self.fail('unique_for_month checks should catch this.')
+
+        p = Post(title="Django 1.0 is released")
+        try:
+            p.full_clean()
+        except ValidationError, e:
+            self.assertEqual(e.message_dict, {'posted': [u'This field cannot be null.']})
+        else:
+            self.fail("Model validation shouldn't allow an absent value for a DateField without null=True.")
+
+    def test_unique_for_date_with_nullable_date(self):
+        p1 = FlexibleDatePost.objects.create(title="Django 1.0 is released",
+            slug="Django 1.0", subtitle="Finally", posted=datetime.date(2008, 9, 3))
+
+        p = FlexibleDatePost(title="Django 1.0 is released")
+        try:
+            p.full_clean()
+        except ValidationError, e:
+            self.fail("unique_for_date checks shouldn't trigger when the associated DateField is None.")
+        except:
+            self.fail("unique_for_date checks shouldn't explode when the associated DateField is None.")
+
+        p = FlexibleDatePost(slug="Django 1.0")
+        try:
+            p.full_clean()
+        except ValidationError, e:
+            self.fail("unique_for_year checks shouldn't trigger when the associated DateField is None.")
+        except:
+            self.fail("unique_for_year checks shouldn't explode when the associated DateField is None.")
+
+        p = FlexibleDatePost(subtitle="Finally")
+        try:
+            p.full_clean()
+        except ValidationError, e:
+            self.fail("unique_for_month checks shouldn't trigger when the associated DateField is None.")
+        except:
+            self.fail("unique_for_month checks shouldn't explode when the associated DateField is None.")