$python manage.py syncdb
Operations to perform:
Apply all migrations: admin, contenttypes, auth, sessions
Running migrations:
No migrations to apply.
Your models have changes that are not yet reflected in a migration, and so won't be applied.
Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them.
the error printscreen
i don't know what the problem !
As the command line output says the problem is that you changed the models. The solution is to run python manage.py makemigrations and then python manage.py migrate.
The Best Thing You can do is, Delete the existing database.
In my case, I were using phpMyAdmin SQL database, so I manually delete the created database overthere.
Again run the following Commands:
python manage.py makemigrations
python manage.py migrate
python manage.py makemigrations <app_name>
python manage.py migrate
IT COULD BE BECAUSE YOU HAVE NOT YET REGISTERED YOUR APP IN SETTINGS.PY inside this file install your app (put the name of your app in quotes) after you can make python3 manage.py makemigrations and then python3 manage.py migrate (it can be python3 or python without the 3 ):
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'new_app_name',
]
Hi my friend after all these steps if there was still this problem.
1- Clear all tables in the database.
2-Clear all history in the migrations folder of your project directory.
3-python manage.py makemigrations
4-python manage.py migrate
Related
I was trying to change the order of the table columns in a postgreSQL table. As I am just starting, it seemed easier to manage.py flush and create a new DB with new name and apply migrations.
I can see the new DB in pgAdmin received all the Django models migrations except my app model/table. I deleted all migrations folder (except 0001_initial.py) and still, when I run python manage.py makemigrations I get:
No changes detected
But the model class table is not in the DB. When I try to migrate the app model it says:
Operations to perform:
Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
No migrations to apply.
Is there any way to delete all tables, makemigrations and migrate and postgres get all the tables? Any idea why postgreSQL/pgAdmin cannot get my Django app model/table?
You can do a particular app migration using below commands:
python manage.py makemigrations your_app_name
python manage.py migrate your_app_name
This works for me.
The app specific migrations in my case were not working.
python manage.py makemigrations your_app_name
python manage.py migrate your_app_name
What did the trick is to modify the models adding an additional fake variable, then all the variables (and not only the additional one) gets picked up by the makemigrations and migrate command. It is not a clever solution but it did the trick.
I have a django project, this is the installed apps entry in settings.py:
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'crawler',
]
when I run python manage.py migrate everything seems to be fine. But when I try to login into django admin page, It says
(1146, "Table 'stock_db.django_session' doesn't exist")
It seems to me that migrate is not creating django admin databases, but why?
I even tried deleting the database, creating it again and running python manage.py makemigrations and python manage.py migrate, It didn't create django_session table.
Migrating your models won't create Admin resources. Those need to be created separately in your admin.py. See more details here
https://docs.djangoproject.com/en/4.1/ref/contrib/admin/
Essentially you need to create a Resource class, specify the fields, define whatever you want:
class MyModelResource(resources.ModelResource):
class Meta:
model = MyModel
fields = [
"your_fields",
]
Finally, you need to register your resource:
admin.site.register(MyModelResource)
Try makemigrations first if it doesnt help continue reading
This type of problem can appear in many situations, most common one is that your migration file system has broken. Reason may be that you tried to edit migration files, or you deleted some of them, or if you work on big teams there may be conflicting migrations. Fixing migrations system takes a lot of time and effort, plus you should know how they work. If project is not in production and you just playing around, I recommend to clear db and delete migration files and run makemigrations and migrate again.
Also be aware if you have multiple apps with models referencing each other with foreign keys or whatever.
Always make sure you run makemigrations before migrate
First run your migrations using below commands:
python manage.py makemigrations appname
python manage.py migrate
If this doesn't work then delete your current migrations using Python manage.py squashmigrations and then re-run migration commands.
I added some table models in models.py for the first time running the app and then ran python manage.py makemigrations followed by python manage.py migrate. This works well but after adding two more tables it doesn't work again.
It created migrations for the changes made but when I run python manage.py migrate nothing happens. My new tables are not added to the database.
Things I have done:
Deleted all files in migrations folder and then run python manage.py makemigrationsfollowed by python manage.py migrate but the new tables are not still not getting added to the database even though the new table models show in the migration that was created i.e 0001_initial.py.
Deleted the database followed by the steps in 1 above but it still didn't solve my problem. Only the first set of tables get created.
Tried python manage.py makemigrations app_name but it still didn't help.
I have run into this problem before and found that running manage.py for specific tables in this fashion worked:
python manage.py schemamigration mytablename --auto
python manage.py migrate
Also make sure that your new table is listed under INSTALLED_APPS in your settings.py.
Can you post your models?
Have you edited manage.py in any way?
Try deleting the migrations and the database again after ensuring that your models are valid, then run manage.py makemigrations appname and then manage.py migrate.
You could try:
Deleted everything in the django-migrations table.
Deleted all files in migrations folder and then run python manage.py makemigrations followed by python manage.py migrate as you said.
If this doesn't work, try:
Deleted everything in the django-migrations table.
Deleted all files in migrations folder, use your old model.py to run python manage.py makemigrations followed by python manage.py migrate.
Add new model, run python manage.py makemigrations followed by python manage.py migrate again.
I get the error:
Exception Value:
no such table: hello_surname
when i try to show a view that accesses the Surname model
in my models.py
class Surname(models.Model):
created = models.DateTimeField('date created', auto_now_add=True)
name = models.CharField(max_length=35)
I've tried to run the migrate $ heroku run python manage.py migrate
ouput:
Running python manage.py migrate on ⬢ sleepy-fjord... up, run.7027
Operations to perform:
Apply all migrations: sessions, auth, hello, contenttypes, admin
Running migrations:
No migrations to apply.
Your models have changes that are not yet reflected in a migration, and so won't be applied.
Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them.
then i run $ heroku run python manage.py makemigrations
output:
Running python manage.py makemigrations on ⬢ sleepy-fjord... up, run.8567
Migrations for 'hello':
0002_surname.py:
- Create model Surname
when i run the top migrate again, it just gives the same output as when i ran it the first time. Seems like I am missing a step here, but with the output i can't seem to figure it out by myself. Anyone know any solutions?
You must run make migrations locally, commit the results, then run migrate on Heroku.
I uploaded my modified code with some changes in models. When I run heroku run python manage.py migrate app to apply the database migrations it gave me an error
CommandError: Conflicting migrations detected (0004_auto_20150819_0827, 0008_auto_20150813_1444 in app).
To fix them run 'python manage.py makemigrations --merge'
So when I run heroku run python manage.py makemigrations --merge it gave me output:
Created new merge migration /app/app/migrations/0009_merge.py
Now how can apply this migration to my database ?
Maybe
heroku run python manage.py migrate
or to see what it's going to apply:
heroku run python manage.py showmigrations