No downtime rolling upgrades with migration

New to django, so wanted to ask some questions that I didn't find good resources for:

1. If you deploy django apps using docker, do you run migrations before launching gunicorn/uwsgi etc within the docker image?

2. If you do, how does rolling migrations work? Won't the non-upgraded replicas start erroring if the new schema is not backward compatible?

3. How do you do non-backward compatible schema upgrades? Do you do it out of band from deployments? Do you shift traffic to a different cluster, and then zero traffic upgrade the whole cluster at once?

Thanks,
Sandip

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nexmo

bonsoir jaimerai utilisé l'api nexmo pour envoyer des msg, quelqu'un l'a t-il deja fait ici??

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Re: It is impossible to add a non-nullable field 'details1' to feature without specifying a default. This is because the database needs something to populate existing rows.

Thank you all, I was able to find a way around it

Is the details1 I set null = True and it worked for me

Sent from my iPhone

On 25 Mar 2023, at 7:52 PM, Henock Lungele <hlungelehenock@gmail.com> wrote:



That means you have done some changes in your model python file. So you have to drop your data base, delete the migration files, recreate the database with the same name as in your configuration python file and do migrations again. This will work or you can add default parameter with a value after max_length parameter for example default="" this will work too but if you take a look to your sql codes, you have define a default behavior if the user type nothing in the input field.

I'm sorry, i speak a little bit english i'm from a french country.

Yours sincerely 

Le sam. 25 mars 2023 à 19:57, Patricia Medina <patriciamedinameneses@gmail.com> a écrit :

Thats because you have values in the database...

If you don't need the data... eliminate the 001, 002, etc files of the migration folder...(this folder is in each application folder) and applicate the migrations again.

On Sat, Mar 25, 2023, 09:00 Ebenezer Otchere <swazyman1994@gmail.com> wrote:

Am new in django and have been getting errors in migrations, i need help

when i try to do migrations it keeps telling me this

it is impossible to add a non-nullable field 'details' to feature without specifying a default. This is because the database needs something to populate existing rows.
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit and manually define a default value in models.py.

Thank you  in advance

from django.db import models

# Create your models here.

class feature(models.Model) :

   

    name = models.CharField(max_length=100)

    extra = models.CharField(max_length=100)

    details1 = models.CharField(max_length=500)

   

class art(models.Model):

   

    name = models.CharField(max_length=100)

    details = models.CharField(max_length=500)

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Re: WHAT OTHER REAL TIME MAP CAN I USE IN MY PROJECT ASIDE GOOGLE MAP?

Here maps:

https://www.here.com

https://heremaps.github.io/


-- Clive

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Re: It is impossible to add a non-nullable field 'details1' to feature without specifying a default. This is because the database needs something to populate existing rows.

That means you have done some changes in your model python file. So you have to drop your data base, delete the migration files, recreate the database with the same name as in your configuration python file and do migrations again. This will work or you can add default parameter with a value after max_length parameter for example default="" this will work too but if you take a look to your sql codes, you have define a default behavior if the user type nothing in the input field.

I'm sorry, i speak a little bit english i'm from a french country.

Yours sincerely 

Le sam. 25 mars 2023 à 19:57, Patricia Medina <patriciamedinameneses@gmail.com> a écrit :

Thats because you have values in the database...

If you don't need the data... eliminate the 001, 002, etc files of the migration folder...(this folder is in each application folder) and applicate the migrations again.

On Sat, Mar 25, 2023, 09:00 Ebenezer Otchere <swazyman1994@gmail.com> wrote:

Am new in django and have been getting errors in migrations, i need help

when i try to do migrations it keeps telling me this

it is impossible to add a non-nullable field 'details' to feature without specifying a default. This is because the database needs something to populate existing rows.
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit and manually define a default value in models.py.

Thank you  in advance

from django.db import models

# Create your models here.

class feature(models.Model) :

   

    name = models.CharField(max_length=100)

    extra = models.CharField(max_length=100)

    details1 = models.CharField(max_length=500)

   

class art(models.Model):

   

    name = models.CharField(max_length=100)

    details = models.CharField(max_length=500)

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Re: It is impossible to add a non-nullable field 'details1' to feature without specifying a default. This is because the database needs something to populate existing rows.

Enter 1 then ' ' rather. Sorry 😓

On Sat, 25 Mar 2023, 5:45 p.m. Muhammed Lawal, <lawalmuhammedope@gmail.com> wrote:

You are seen that error probably because you modified your models after adding some items to database already. When prompted with the error, enter 2, then ' ' an empty string. 

On Sat, 25 Mar 2023, 1:59 p.m. Ebenezer Otchere, <swazyman1994@gmail.com> wrote:

Am new in django and have been getting errors in migrations, i need help

when i try to do migrations it keeps telling me this

it is impossible to add a non-nullable field 'details' to feature without specifying a default. This is because the database needs something to populate existing rows.
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit and manually define a default value in models.py.

Thank you  in advance

from django.db import models

# Create your models here.

class feature(models.Model) :

   

    name = models.CharField(max_length=100)

    extra = models.CharField(max_length=100)

    details1 = models.CharField(max_length=500)

   

class art(models.Model):

   

    name = models.CharField(max_length=100)

    details = models.CharField(max_length=500)

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Re: It is impossible to add a non-nullable field 'details1' to feature without specifying a default. This is because the database needs something to populate existing rows.

You are seen that error probably because you modified your models after adding some items to database already. When prompted with the error, enter 2, then ' ' an empty string. 

On Sat, 25 Mar 2023, 1:59 p.m. Ebenezer Otchere, <swazyman1994@gmail.com> wrote:

Am new in django and have been getting errors in migrations, i need help

when i try to do migrations it keeps telling me this

it is impossible to add a non-nullable field 'details' to feature without specifying a default. This is because the database needs something to populate existing rows.
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit and manually define a default value in models.py.

Thank you  in advance

from django.db import models

# Create your models here.

class feature(models.Model) :

   

    name = models.CharField(max_length=100)

    extra = models.CharField(max_length=100)

    details1 = models.CharField(max_length=500)

   

class art(models.Model):

   

    name = models.CharField(max_length=100)

    details = models.CharField(max_length=500)

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