I modified a model field in my local environment and made the migrations. Every thing seemed fine until I pushed it to production. I tried to apply the migrations to my DB and received an error:
cannot ALTER TABLE because it has pending trigger events
I ended up just reverting to the previous migration, which solved the problem for now.
But now I have these unapplied migration files pending and I need to find a way to either delete them or ignore them. What is the best solution moving forward?
Local
Production
You can fake the problematic migration (documentation here) - and then run the rest of the migrations.
Should be:
python manage.py migrate --fake 000x_problematic_migration
And then run the rest of the migrations
python manage.py migrate
Related
I read advices how to delete migrations but I don't understand what I'm doing and it's not working for me.
History. One day I had an issue when I added or renamed a model fields locally. So I was tired with that issue and I deleted all migrations and migrate again. And all was OK. But I remember that I will have a big problem when I will deploy on Heroku.
So the days are gone. And now it happened. :(((
I make migrations, migrate to a server database. Pushed my code, but.. it wrote me:
relation "accounts_goal" does not exist
LINE 1: SELECT COUNT(*) AS "__count" FROM "accounts_goal"
I understand it happened because locally I have 0001 and 0002 migrations, but on the server there are 0012 and etc. migrations. I think I need to delete all old migrations on the server. But I don't know how to do that. Help me please! Thank you)
At first, do not delete a table from the database before the migration. If you change your model, then manage.py migrate will do the thing. Django cannot detect the direct change of database; only knows the change of model script (makemigrations).
Sometimes migration doesn't work for no reasons. In that case, do the following things:
Undo the change of models.py (comment, delete).
manage.py makemigrations app-name.
manage.py migrate
Change the models.py again (as you wish).
Do the migration again.
Also you can try python manage.py migrate --fake.
If there is already a table present, Django will see that the initial migration has already been applied since the table is already present with old schema and therefore not taking the new table with different schema into consideration.
In that case, you need to drop tables in the database you can use python manage.py migrate app-name zero.
I have a Postgres database full of data. And I made several changes to my Django app models.
mange.py makemigrations worked fine and created the migration files. But manage.py migrate execute only one file. And when I launch it again it doesn’t execute the rest as if they are already applied.
I deleted the migration files that were not applied and did another makemigration but it says no changes detected.
Any ideas how to reflect the models changes on the database without losing the data ?
Thanks
Django keeps track of which migrations it has applied already, so when you run the migrate command it will execute only the migrations that Django thinks that are missing.
I deleted the migration files that were not applied and did another makemigration but it says no changes detected.
This was a bad idea, it will make your migrations inconsistent.
If you want to go back in time, instead of deleting migrations, the proper way to do this is by reverting migrations. You can use the same migrate command and specify to which migration point you want your database model to be.
Check this answer for further information about reverting migrations; django revert last migration
when i try to run python manage.py migrate i run into following error
Upon running python manage.py run migrations it says no changes detected. and when i runserver it gives me warning that i have unapplied migrations as well.i have been searching internet for two hours but got not solution. Someone knowing the solution please share :)
The table in your database that stores migration data to keep track of what has been applied is out of date. Try running python manage.py migrate --fake
Try python manage.py makemigrations [app name] and if still, this does detect changes then delete the folder named migrations which is inside your application folder and then use this python manage.py makemigrations [app name]. Once migration happens successfully do the python manage.py migrate.
Don't Try This at Home
I faced this issue, i make two changes,
change AUTH_USER_MODEL, so i have one migraiton about it
second one add new field for my folder_model(migration name: folder_model 0021)
When my first migrate attempt(I already run makemigrations commands on local so i have migration files), it says;
django.db.migrations.exceptions.InconsistentMigrationHistory: Migration admin.0001_initial is applied before its dependency account.0001_initial on database 'default'
This error reiases because i change the AUTH_USER_MODEL in the middle of the project, normally you have to remove your database and fresh start from the beginnig(also truncate migrations etc.), according to Django doc -> https://code.djangoproject.com/ticket/25313
To fix this issue, you don't have to delete all migrations on db, just delete the migrations about admin(not from project just database)
After that just run
python manage.py migrate
It throws relation "django_admin_log" already exists. For this issue, run:
python manage.py migrate --fake
That's it, but not completely. Make fake migration act like you already make your all migrations successfully and save these on db. The issue came here that i have another migration about folder_model 0021 and with fake migration it doesn't applied to my database table but saved to db_migrations table.
So fix this issue, delete the folder_model 0021to database migration table (just 0021 not all folder_model migrations).
After delete just run python manage.py migrate
Everything is fine!
When running python manage.py migrate I encounter this error:
django.db.migrations.exceptions.InconsistentMigrationHistory: Migration
<appname>.0016_auto_<date2>_<time2> is applied before its dependency
<appname>.0001_squashed_0015_auto_<date1>_<time1>
running showmigrations returns:
<appname>
[X] 0001_squashed_0015_auto_<date1>_<time1> (15 squashed migrations)
[X] 0016_auto_<date2>_<time2>
[ ] 0017_<modelname>_squashed_0019_auto_<date3>_<time3> (3 squashed migrations)
I was trying out django-extensions yesterday, when it all got messed up after me running some direct SQL queries and I reset hard using git. I'm still learning about migrations, so I don't understand what is wrong, since it seems to me that both migrations already have been applied.
Thank you for your help!
This worked for me. I thank my coworker for sharing this knowledge after I searched online for many hours.
Start your db shell
python manage.py dbshell
Use the database you want. If you don't know, run .databases (SQLite) or SHOW databases
mysql>use <database_name>;
Retrieve all the migrations under your app
mysql> select * from django_migrations where app='<app>';
You will see the output with ids next to all migrations. Look at the migration you want to drop. Say the id is 361
mysql> delete from django_migrations where id=361;
You have squashed the migrations, so one of the dependencies that 0016_auto_<date2>_<time2> had is now part of the newly created squashed migrations. Meanwhile the 0016_auto_<date2>_<time2> has already been run and now you're trying to run the squashed migration.
I personally don't know if there's any way to fix this automatically. You will need to fix the issues yourself. If you have version control, revert these changes and try to rethink how you should squash the migration without affecting old ones.
I have solved this problem when i did (custom user model) by this steps:
delete this file :
migrations\0001_initial.py
delete this :
db.sqlite3
put this code in settings.py :
AUTH_USER_MODEL = 'users.CustomUser'
Then do (makemigrations) then (migrate )
run server .. the problem solved :)
i have used this link it is help me to solve the problem of dependency :
https://docs.djangoproject.com/en/3.1/topics/auth/customizing/
Due to limitations of Django’s dynamic dependency feature for swappable models, the model referenced by AUTH_USER_MODEL must be created in the first migration of its app (usually called 0001_initial); otherwise, you’ll have dependency issues.
In addition, you may run into a CircularDependencyError when running your migrations as Django won’t be able to automatically break the dependency loop due to the dynamic dependency. If you see this error, you should break the loop by moving the models depended on by your user model into a second migration. (You can try making two normal models that have a ForeignKey to each other and seeing how makemigrations resolves that circular dependency if you want to see how it’s usually done.)
run this python manage.py dbshell
INSERT INTO public.django_migrations(app, name, applied)
VALUES ('YOUR_APP_NAME, '0017_<modelname>_squashed_0019_auto_<date3>_<time3>', now());
and you should be fine. If Your migration was changing a lot to the database, then I am afraid it won't be that easy to fix it.
you need to fake migrations and migrate again
just make sure that you have a backup from your data because when you migrate again you need to delete apps table.
make sure that you look at show migrations and migrate un migrated apps by its sequence
Edit the dependencies of the conflicting migration, so that it no longer references the already applied migration.
Then run python manage.py migrate again and it should be fixed.
Warning: this only work suppossing that the state of the database matchs the state you get having applied the conflicting migration.
I had the same issue on 2020 with Django 3.0.6.
I tried all the relevant answers with no success. So I went in my database and deleted all the tables. You must export the relevant tables if you have done lot of work. I mainly delete django files in my database. And after, run:
python manage.py makemigrations <my-app>
And:
python manage.py migrate
Export your relevant tables if any.
First back up your database before resolving the conflicts, (Use "python manage.py dumpdata > db.json" for SQLite).
Execute python manage.py dbshell, to access the database.
Delete the migrations rows that are having conflicts from the django_migrations table.
Rename the tables conflicting in the database
Execute the makemigrations and migrate commands
After successful migrations, Drop the newly readded tables and finally restore the previously renamed tables to match the migrations need
I had the same problem, and here's how I solved it.
The following is my error message
File "/usr/local/lib/python3.11/site-packages/django/db/migrations/loader.py", line 327, in check_consistent_history
raise InconsistentMigrationHistory(
django.db.migrations.exceptions.InconsistentMigrationHistory: Migration aaaa.0024_campaign_template is applied before its dependency bbbb.0005_templatemodel_from_template on database 'default'.
My solution
python manage.py migrate bbbb
python manage.py migrate
Because I changed the Django's app name in batches, the application order was not consistent when applied to the database. The bbbb that aaaa relies on was not created first, so I manually created the bbbb first
Migration file is not created for all app:
step 1:
create migration folder and add __init__.py file for all app
step 2:
delete db.sqlite3 database
step 3:
python manage.py migrate
python manage.py makemigrations
Delete all of your migrations folder
Delete the database(sqlite3)
Then run the makemigrations and migrate command
Delete the migration files.
Run:
python manage.py migrate
python manage.py makemigrations
python manage.py migrate
python manage.pyrunserver
I deployed a new django app on Heroku which worked out fine. However, today I changed my model a little bit (added a new field) and afterwards deleted my development server file db-sqlite3 and the migrations folder in order to reflect the changes in the development database. This worked out fine on the local server but when I pushed this to heroku I get a 500 error when trying to access the model in the django-admin section.
I tried to run some migrations via heroku but I get the following error message:
! These migrations are in the database but not on disk:
<joins: 0002_auto__add_field_join_ip_address>
<joins: 0003_auto__add_unique_join_email>
<joins: 0004_auto__add_field_join_ref_id>
<joins: 0005_auto__add_unique_join_email_ref_id>
<joins: 0006_auto__add_unique_join_ref_id>
<joins: 0007_auto__del_unique_join_ref_id>
<joins: 0008_auto__del_unique_join_email__add_unique_join_ref_id>
<joins: 0009_auto__add_field_join_friend>
! I'm not trusting myself; either fix this yourself by fiddling
! with the south_migrationhistory table, or pass --delete-ghost-migrations
! to South to have it delete ALL of these records (this may not be good).
(lwc) Daniels-MacBook-Pro:src danielrichter$ heroku run python manage.py migrate --delete-ghost-migrations
I can see that in my local migrations folder I only have the 0001_initial migration and somehow missing the other but I have no idea how to resolve the issue.
I have seen that others ran into the same error message, but I did not understand the proposed answers, since I am quite new to Django and coding in general. So if there is someone who could give me a hint how to resolve this I would be very thankful!
many many thanks!
Apparently the database thinks you have applied the migrations mentioned in the message, but it can't find the files on disk. Which you confirm. Maybe there was something wrong with your version management and you lost these files? I'd try to see if you can recover the files, then the problem would be over.
If not, it is a bit more difficult. The migrations mentioned have probably already been executed but the files are lost. Also you have made new changes which have not been applied. You should try to get your code state back to the state where the last missing migration was executed. You can then make a new migration file (python manage.py schemamigration --auto your_app_name) which can replace the missing migration files. This migration will be called 0002_something (0001 being present and 0002 being the next). After this replacement migration you can have new migrations (0003 and further).
On the server, before updating your version of the code (so you don't already have 0002) execute python manage.py migrate --delete-ghost-migrations. This will delete the references to the missing migration. Afterwards you can update your version and get the new 0002 etc migrations.
Call python manage.py migrate --fake your_app_name 0002. This will tell the database that the migration was applied, without actually applying anything. This is good because the changes were already applied by the lost migration files.
After this, you can run normal migrations: python manage.py migrate and it should be good.
Hope this helps.
and afterwards deleted my development server file db-sqlite3 and the
migrations folder in order to reflect the changes in the development
database
This is your issue, you shouldn't delete any migration files, if you make a change in your database, django (or south) will create a new migration file for those changes, then you run the migration command to apply those changes to your database, you have to commit those new migration files and send them to heroku, so the changes will be applied to the remote database too.
The workflow is like this:
You have some migration files or the initial one
Edit your models by adding/removing fields
Create migration file(s), in django (without South):
python manage.py makemigrations
Apply those changes to your local database by runnig:
heroku run python manage.py migrate
Add those model changes and migration files to your git index
Push the changes to heroku and run the migration command:
heroku run python manage.py migrate