django: exclude models from migrations

Question

In my django application (django 1.8) I'm using two databases, one 'default' which is MySQL, and another one which is a schemaless, read-only database. I've two models which are accessing this database, and I'd like to exclude these two models permanently from data and schema migrations:

makemigrations should never detect any changes, and create migrations for them
migrate should never complain about missing migrations for that app

So far, I've tried different things, all without any success:

used the managed=False Meta option on both Models
added a allow_migrate method to my router which returns False for both models

Does anyone have an example of how this scenario can be achieved? Thanks for your help!

Usually `managed=False` is the way. What's the problem with it? — Ivan, Oct 28 '15 at 09:39
include the code part you done also because as @Ivan suggests it is the way — Renjith Thankachan, Dec 28 '16 at 12:31
I believe that this post answers your question: http://stackoverflow.com/questions/33820715/how-to-disable-migration-from-one-model-of-an-app-in-django — Brian Fincher, Jan 06 '17 at 16:42
Check this answer: http://stackoverflow.com/a/26789687/3042057 — Emin Mastizada, Mar 17 '17 at 15:28

score 2 · Answer 1 · answered May 17 '17 at 02:45

So far, I've tried different things, all without any success:

used the managed=False Meta option on both Models

That option (the managed = False attribute on the model's meta options) seems to meet the requirements.

If not, you'll need to expand the question to say exactly what is special about your model that managed = False doesn't do the job.

score 2 · Answer 2 · answered Nov 02 '17 at 01:59

I thought, I have a problem with makemigrations. It pretends to make migration on managed = False model, but no SQL code generated for this model

Here is my example, model Smdocumets unmanaged, and no SQL code was generated.

python manage.py makemigrations

Migrations for 'monitor':
  monitor\migrations\0005_auto_20171102_1125.py
    - Create model Smdocuments
    - Add field sid to db
    - Alter field name on db

python manage.py sqlmigrate monitor 0005

BEGIN;
--
-- Create model Smdocuments
--
--
-- Add field sid to db
--
ALTER TABLE "monitor_db" RENAME TO "monitor_db__old"; 
...

score 2 · Answer 3 · answered Jul 20 '21 at 19:28

You have the correct solution:

used the managed=False Meta option on both Models

It may appear that it is not working but it is likely that you are incorrectly preempting the final result when you see - Create model xxx for models with managed = False when running makemigrations. How have you been checking/confirming that migrations are being made?

makemigrations will still print to terminal - Create model xxx and create code in the migration file but those migrations will not actually result in any SQL code or appear in Running migrations: when you run migrate.

django: exclude models from migrations

3 Answers3