Fixed #9932 -- Added a validation error when an inline tries to exclude the foreign key that provides the link to the parent model. Thanks to david for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10668 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_validation/models.py

@@ -4,12 +4,16 @@ Tests of ModelAdmin validation logic.
 
 from django.db import models
 
+class Album(models.Model):
+    title = models.CharField(max_length=150)
+
 class Song(models.Model):
     title = models.CharField(max_length=150)
-    
+    album = models.ForeignKey(Album)
+
     class Meta:
         ordering = ('title',)
-        
+
     def __unicode__(self):
         return self.title
 
@@ -19,9 +23,7 @@ __test__ = {'API_TESTS':"""
 >>> from django.contrib import admin
 >>> from django.contrib.admin.validation import validate
 
-#
 # Regression test for #8027: custom ModelForms with fields/fieldsets
-#
 
 >>> class SongForm(forms.ModelForm):
 ...     pass
@@ -40,4 +42,20 @@ Traceback (most recent call last):
     ...
 ImproperlyConfigured: 'InvalidFields.fields' refers to field 'spam' that is missing from the form.
 
+# Regression test for #9932 - exclude in InlineModelAdmin
+# should not contain the ForeignKey field used in ModelAdmin.model
+
+>>> class SongInline(admin.StackedInline):
+...     model = Song
+...     exclude = ['album']
+
+>>> class AlbumAdmin(admin.ModelAdmin):
+...     model = Album
+...     inlines = [SongInline]
+
+>>> validate(AlbumAdmin, Album)
+Traceback (most recent call last):
+    ...
+ImproperlyConfigured: SongInline cannot exclude the field 'album' - this is the foreign key to the parent model Album.
+
 """}