[1.7.x] Fixed #22563: Added migration to admin, fixed a few more loader issues.

django/contrib/admin/migrations/0001_initial.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('contenttypes', '__latest__'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='LogEntry',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('action_time', models.DateTimeField(auto_now=True, verbose_name='action time')),
+                ('object_id', models.TextField(null=True, verbose_name='object id', blank=True)),
+                ('object_repr', models.CharField(max_length=200, verbose_name='object repr')),
+                ('action_flag', models.PositiveSmallIntegerField(verbose_name='action flag')),
+                ('change_message', models.TextField(verbose_name='change message', blank=True)),
+                ('content_type', models.ForeignKey(to_field='id', blank=True, to='contenttypes.ContentType', null=True)),
+                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL, to_field='id')),
+            ],
+            options={
+                'ordering': ('-action_time',),
+                'db_table': 'django_admin_log',
+                'verbose_name': 'log entry',
+                'verbose_name_plural': 'log entries',
+            },
+            bases=(models.Model,),
+        ),
+    ]

django/db/migrations/autodetector.py

@@ -205,7 +205,7 @@ class MigrationAutodetector(object):
                         elif dep[0] != app_label:
                             # External app dependency. See if it's not yet
                             # satisfied.
-                            for other_operation in self.generated_operations[dep[0]]:
+                            for other_operation in self.generated_operations.get(dep[0], []):
                                 if self.check_dependency(other_operation, dep):
                                     deps_satisfied = False
                                     break

django/db/migrations/loader.py

@@ -135,7 +135,7 @@ class MigrationLoader(object):
             return self.disk_migrations[results[0]]
 
     def check_key(self, key, current_app):
-        if key[1] != "__first__" or key in self.graph:
+        if (key[1] != "__first__" and key[1] != "__latest__") or key in self.graph:
             return key
         # Special-case __first__, which means "the first migration" for
         # migrated apps, and is ignored for unmigrated apps. It allows
@@ -151,7 +151,10 @@ class MigrationLoader(object):
             return
         if key[0] in self.migrated_apps:
             try:
-                return list(self.graph.root_nodes(key[0]))[0]
+                if key[1] == "__first__":
+                    return list(self.graph.root_nodes(key[0]))[0]
+                else:
+                    return list(self.graph.root_nodes(key[0]))[-1]
             except IndexError:
                 raise ValueError("Dependency on app with no migrations: %s" % key[0])
         raise ValueError("Dependency on unknown app: %s" % key[0])