[1.6.x] Fixed #13696 -- ensured inline pk field is rendered

Backport of 3aad955ea8 from master.

django/contrib/admin/helpers.py

@@ -266,10 +266,12 @@ class InlineAdminForm(AdminForm):
             yield InlineFieldset(self.formset, self.form, name,
                 self.readonly_fields, model_admin=self.model_admin, **options)
 
-    def has_auto_field(self):
+    def needs_explicit_pk_field(self):
-        if self.form._meta.model._meta.has_auto_field:
+        # Auto fields are editable (oddly), so need to check for auto or non-editable pk
+        if self.form._meta.model._meta.has_auto_field or not self.form._meta.model._meta.pk.editable:
             return True
-        # Also search any parents for an auto field.
+        # Also search any parents for an auto field. (The pk info is propagated to child
+        # models so that does not need to be checked in parents.)
         for parent in self.form._meta.model._meta.get_parent_list():
             if parent._meta.has_auto_field:
                 return True

django/contrib/admin/templates/admin/edit_inline/stacked.html

@@ -13,7 +13,7 @@
   {% for fieldset in inline_admin_form %}
     {% include "admin/includes/fieldset.html" %}
   {% endfor %}
-  {% if inline_admin_form.has_auto_field %}{{ inline_admin_form.pk_field.field }}{% endif %}
+  {% if inline_admin_form.needs_explicit_pk_field %}{{ inline_admin_form.pk_field.field }}{% endif %}
   {{ inline_admin_form.fk_field.field }}
 </div>{% endfor %}
 </div>

django/contrib/admin/templates/admin/edit_inline/tabular.html

@@ -29,7 +29,7 @@
           {% if inline_admin_form.original %} {{ inline_admin_form.original }}{% endif %}
           {% if inline_admin_form.show_url %}<a href="{% url 'admin:view_on_site' inline_admin_form.original_content_type_id inline_admin_form.original.pk %}">{% trans "View on site" %}</a>{% endif %}
             </p>{% endif %}
-          {% if inline_admin_form.has_auto_field %}{{ inline_admin_form.pk_field.field }}{% endif %}
+          {% if inline_admin_form.needs_explicit_pk_field %}{{ inline_admin_form.pk_field.field }}{% endif %}
           {{ inline_admin_form.fk_field.field }}
           {% spaceless %}
           {% for fieldset in inline_admin_form %}

tests/admin_inlines/admin.py

@@ -12,8 +12,26 @@ class BookInline(admin.TabularInline):
     model = Author.books.through
 
 
+class NonAutoPKBookTabularInline(admin.TabularInline):
+    model = NonAutoPKBook
+
+
+class NonAutoPKBookStackedInline(admin.StackedInline):
+    model = NonAutoPKBook
+
+
+class EditablePKBookTabularInline(admin.TabularInline):
+    model = EditablePKBook
+
+
+class EditablePKBookStackedInline(admin.StackedInline):
+    model = EditablePKBook
+
+
 class AuthorAdmin(admin.ModelAdmin):
-    inlines = [BookInline]
+    inlines = [BookInline,
+        NonAutoPKBookTabularInline, NonAutoPKBookStackedInline,
+        EditablePKBookTabularInline, EditablePKBookStackedInline]
 
 
 class InnerInline(admin.StackedInline):

tests/admin_inlines/models.py

@@ -3,6 +3,7 @@ Testing of admin inline formsets.
 
 """
 from __future__ import unicode_literals
+import random
 
 from django.db import models
 from django.contrib.contenttypes.models import ContentType
@@ -48,6 +49,25 @@ class Author(models.Model):
     books = models.ManyToManyField(Book)
 
 
+class NonAutoPKBook(models.Model):
+    rand_pk = models.IntegerField(primary_key=True, editable=False)
+    author = models.ForeignKey(Author)
+    title = models.CharField(max_length=50)
+
+    def save(self, *args, **kwargs):
+        while not self.rand_pk:
+            test_pk = random.randint(1, 99999)
+            if not NonAutoPKBook.objects.filter(rand_pk=test_pk).exists():
+                self.rand_pk = test_pk
+        super(NonAutoPKBook, self).save(*args, **kwargs)
+
+
+class EditablePKBook(models.Model):
+    manual_pk = models.IntegerField(primary_key=True)
+    author = models.ForeignKey(Author)
+    title = models.CharField(max_length=50)
+
+
 class Holder(models.Model):
     dummy = models.IntegerField()
 

tests/admin_inlines/tests.py

@@ -211,6 +211,24 @@ class TestInline(TestCase):
         self.assertContains(response, max_forms_input % 2)
         self.assertContains(response, total_forms_hidden)
 
+    def test_inline_nonauto_noneditable_pk(self):
+        response = self.client.get('/admin/admin_inlines/author/add/')
+        self.assertContains(response,
+            '<input id="id_nonautopkbook_set-0-rand_pk" name="nonautopkbook_set-0-rand_pk" type="hidden" />',
+             html=True)
+        self.assertContains(response,
+            '<input id="id_nonautopkbook_set-2-0-rand_pk" name="nonautopkbook_set-2-0-rand_pk" type="hidden" />',
+             html=True)
+
+    def test_inline_editable_pk(self):
+        response = self.client.get('/admin/admin_inlines/author/add/')
+        self.assertContains(response,
+            '<input class="vIntegerField" id="id_editablepkbook_set-0-manual_pk" name="editablepkbook_set-0-manual_pk" type="text" />',
+             html=True, count=1)
+        self.assertContains(response,
+            '<input class="vIntegerField" id="id_editablepkbook_set-2-0-manual_pk" name="editablepkbook_set-2-0-manual_pk" type="text" />',
+             html=True, count=1)
+
 
 @override_settings(PASSWORD_HASHERS=('django.contrib.auth.hashers.SHA1PasswordHasher',))
 class TestInlineMedia(TestCase):