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I want to get the name of the last applied migration in Django. I know that Django migrations are stored in django_migrations table, however django.db.migrations.migration.Migration is not a models.Model backed by that table. This means you cannot do:
migration_info = Migration.objects.all()
Is there any built-in way of retrieveing the data from django_migrations, or should i just create my own read-only Model:
class MigrationInfo(models.Model):
class Meta:
managed = False
db_table = "django_migrations"
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You have unapplied migrations; your app may not work properly until they are applied. Run 'python manage.py migrate' to apply them. How can I find out which migrations are unapplied without running migrate? One way to do this is to look at the django_migrations table in the DB and check which ones are applied.
Django Migrations Custom names for migration filesUse the makemigrations --name <your_migration_name> option to allow naming the migrations(s) instead of using a generated name.
Django keeps track of applied migrations in the Django migrations table. Django migrations consist of plain Python files containing a Migration class. Django knows which changes to perform from the operations list in the Migration classes. Django compares your models to a project state it builds from the migrations.
migrate , which is responsible for applying and unapplying migrations. makemigrations , which is responsible for creating new migrations based on the changes you have made to your models.
This works on Django 1.11/1.8/2.1 & 3.0.4:
from django.db.migrations.recorder import MigrationRecorder
last_migration = MigrationRecorder.Migration.objects.latest('id')
print(last_migration.app) # The app where the migration belongs
print(last_migration.name) # The name of the migration
There doesn't seem to be documentation for this command, but here you may find the source code which is documented properly.
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To store information about applied migrations Django uses plain table and it is accessible as @classproperty through the MigrationRecorder class:
from django.db.migrations.recorder import MigrationRecorder
lm = MigrationRecorder.Migration.objects.filter(app='core').last()
It is also easy to retrieve this information from the command line:
python manage.py showmigrations --list <app_name> | grep "\[X\]" | tail -1
python manage.py showmigrations --plan | grep "\[ \]"
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