Check for pending Django migrations

django migrations runpython
django migrations reset
django migration insert data
no migrations to apply django
django rollback migration
django force migration
django migrate dry-run
django migrations realpython

In Django, is there an easy way to check whether all database migrations have been run? I've found manage.py migrate --list, which gives me the information I want, but the format isn't very machine readable.

For context: I have a script that shouldn't start running until the database has been migrated. For various reasons, it would be tricky to send a signal from the process that's running the migrations. So I'd like to have my script periodically check the database to see if all the migrations have run.


Shell

The only simple solution I've found so far is running

./manage.py showmigrations | grep '\[ \]'

which will output an empty string in case all migrations have been applied.

However, it is closely tied to the output format.

Python

I checked the source code of migrate command and it seems like this should do the trick:

from django.db.migrations.executor import MigrationExecutor
from django.db import connections, DEFAULT_DB_ALIAS


def is_database_synchronized(database):
    connection = connections[database]
    connection.prepare_database()
    executor = MigrationExecutor(connection)
    targets = executor.loader.graph.leaf_nodes()
    return not executor.migration_plan(targets)

# Usage example.
if is_database_synchronized(DEFAULT_DB_ALIAS):
    # All migrations have been applied.
    pass
else:
    # Unapplied migrations found.
    pass

Migrations | Django documentation, There's a simple solution by adding a migration check before deploying: src/backend/manage.py makemigrations --check --dry-run --settings=conf. settings. test > /dev/null || echo "Missing migrations." In Django, is there an easy way to check whether all database migrations have been run? I’ve found manage.py migrate --list, which gives me the information I want, but the format isn’t very machine readable. For context: I have a script that shouldn’t start running until the database has been migrated. For various reasons, it […]


1.10 release notes:

The new makemigrations --check option makes the command exit with a non-zero status when model changes without migrations are detected.

Checking that Django has all migrations. - Kit Sunde, I've written a small generic unit-test that one should be able to drop into the tests directory of any Django project and that checks there's no  For an initial migration that creates one or more tables (CreateModel operation), Django checks that all of those tables already exist in the database and fake-applies the migration if so. Similarly, for an initial migration that adds one or more fields ( AddField operation), Django checks that all of the respective columns already exist in the database and fake-applies the migration if so.


Try,

python manage.py migrate --list | grep "\[ \]\|^[a-z]" | grep "[ ]" -B 1

returns,

<app_1>
 [ ] 0001_initial
 [ ] 0002_auto_01201244
 [ ] 0003_auto_12334333

<app_2>
 [ ] 0031_auto_12344544
 [ ] 0032_auto_45456767
 [ ] 0033_auto_23346566

<app_3>
 [ ] 0008_auto_3446677

Update:

If you have updated Django version >= 1.11, use below command,

python manage.py showmigrations | grep '\[ \]\|^[a-z]' | grep '[  ]' -B 1

Testing for pending migrations in Django, In Django, is there an easy way to check whether all database migrations have been run? I've found manage.py migrate --list , which gives me  Django Database Migrations. Migration is a way of applying changes that we have made to a model, into the database schema. Django creates a migration file inside the migration folder for each model to create the table schema, and each table is mapped to the model of which migration is created.


./manage.py showmigrations #check which already-made migrations have been applied or not (or: ./manage.py showmigrations someApp #for specific app alone)

./manage.py makemigrations --dry-run #check for migrations to be made (or: ./manage.py makemigrations someApp --dry-run #for specific app alone)

./manage.py makemigrations #make the migrations (or: ./manage.py makemigrations someApp #for specific app alone)

./manage.py showmigrations #check which already-made migrations have been applied or not (or: ./manage.py showmigrations someApp #for specific app alone)

./manage.py sqlmigrate someApp 0001 #view SQL changes for specific app & migration

./manage.py migrate #apply migrations (or: ./manage.py migrate someApp #for specific app alone)

./manage.py showmigrations #check which already-made migrations have been applied or not (or: ./manage.py showmigrations someApp #for specific app alone)

./manage.py makemigrations --dry-run #check for migrations to be made (or: ./manage.py makemigrations someApp --dry-run #for specific app alone)

PS: ./manage.py migrate someApp zero #unapply all migrations for specific app

Check for pending Django migrations, Django also uses these Operation objects to work out what your models looked them without touching the database to work out what your project should look like​. cannot ALTER TABLE "mytable" because it has pending trigger events . Sometimes you’ll need to reset your Django migrations or simply make a clean up. This process can be performed very easily in many situations but can also become complex if you have a big number of migration files and database tables .In this tutorial I’ll show you a few options to enable you to effectively delete or reset your Django database migrations without affecting the working of your project.


Using @Ernest code, I've written a manage_custom.py for pending migrations. You can get the list of pending migrations also migrate those pending migrations (only), hence saving your time.

manage_custom.py

__author__ = "Parag Tyagi"

# set environment
import os
import sys
import django
sys.path.append('../')
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'settings')
django.setup()

from django.core.management import execute_from_command_line
from django.db import DEFAULT_DB_ALIAS, connections
from django.db.migrations.executor import MigrationExecutor


class Migration(object):
    """
    A custom manage.py file for managing pending migrations (only)
    """

    def __init__(self, migrate_per_migration_id=False):
        """
        :param migrate_per_migration_id: Setting this to `True` will migrate each pending migration of any
        particular app individually. `False` will migrate the whole app at a time.

        You can add more arguments (viz. showmigrations, migrate) by defining the argument with prefix as 'ARGV_'
        and create its functionality accordingly.
        """
        self.ARG_PREFIX = 'ARGV_'
        self.MIGRATE_PER_MIGRATION_ID = migrate_per_migration_id
        self.ARGV_showmigrations = False
        self.ARGV_migrate = False

    @staticmethod
    def get_pending_migrations(database):
        """
        :param database: Database alias
        :return: List of pending migrations
        """
        connection = connections[database]
        connection.prepare_database()
        executor = MigrationExecutor(connection)
        targets = executor.loader.graph.leaf_nodes()
        return executor.migration_plan(targets)

    def check_arguments(self, args):
        """
        Method for checking arguments passed while running the command
        :param args: Dictionary of arguments passed while running the script file
        :return: Set the argument variable ('ARGV_<argument>') to True if found else terminate the script
        """
        required_args = filter(None, [var.split(self.ARG_PREFIX)[1] if var.startswith(self.ARG_PREFIX)
                                      else None for var in self.__dict__.keys()])
        if any(k in args for k in required_args):
            for arg in required_args:
                if arg in args:
                    setattr(self, '{}{}'.format(self.ARG_PREFIX, arg), True)
                    break
        else:
            print ("Please pass argument: {}"
                   "\ne.g. python manage_custom.py {}".format(required_args, required_args[0]))
            sys.exit()

    def do_migration(self):
        """
        Migrates all the pending migrations (if any)
        """
        pending_migrations = self.get_pending_migrations(DEFAULT_DB_ALIAS)
        if pending_migrations:
            done_app = []
            for mig in pending_migrations:
                app, migration_id = str(mig[0]).split('.')
                commands = ['manage.py', 'migrate'] + ([app, migration_id] if self.MIGRATE_PER_MIGRATION_ID else [app])
                if self.ARGV_migrate and (app not in done_app or self.MIGRATE_PER_MIGRATION_ID):
                    execute_from_command_line(commands)
                    done_app.append(app)
                elif self.ARGV_showmigrations:
                    print (str(mig[0]))
        else:
            print ("No pending migrations")


if __name__ == '__main__':
    args = sys.argv
    migration = Migration()
    migration.check_arguments(args)
    migration.do_migration()

Usage:

# below command will show all pending migrations
python manage_custom.py showmigrations

# below command will migrate all pending migrations
python manage_custom.py migrate

PS: Please setup environment as per your project structure.

Migration Operations, Shell. The only simple solution I've found so far is running ./manage.py showmigrations | grep '\[ \]'. which will output an empty string in case all  Naming Migrations. In the above example, Django came up with a name for the migration based on the timestamp—something like *0002_auto_20181112_1950. If you’re not happy with that, then you can use the --name parameter to provide a custom name (without the .py extension). To try that out, you first have to remove the old migration.


Check for pending Django migrations – Icetutor, You will need to read the sections Migrations overhaul and Added a check command below. Introducing Django 1.5 support, dropped support for Django 1.3 and  You can check the existing table name through sqlmigrate or dbshell. You can check the new table name with the through model’s _meta.db_table property. Your new through model should use the same names for the ForeignKey s as Django did. Also if it needs any extra fields, they should be added in operations after SeparateDatabaseAndState.


2.4 release notes, Add a check to ensure that all the makemigrations are done and there is "No changes detected" in the migrations. The command to check this would be: Can remove this: https://github.com/openwisp/django-ipam/blob/  The django migrations system is very powerful, flexible and designed to handle big amount of migrations but having a lot of models migrations causes problems when frequently changing your database structure (during development phase in most cases) to most Django developers, both beginners and even experienced.


[ci] add check for pending migrations · Issue #53 · openwisp , A "model" in the Django world is a Python class that represents a table in the database. These field definitions not only determine what type of column is defined in the Now I can, once again, apply the pending migrations: from django.utils.text import slugify slugify ('Hello, World!') 'hello-world' slugify ('How to Extend the Django User Model') 'how-to-extend-the-django-user-model' Anyway, the function used by the RunPython method to create a data migration, expects two parameters: apps and schema_editor .