Change settings value during run-time in migrations

[Ajay Tripathi]

Hi,

I am trying to change a value in `settings.py` during run-time while creating migrations.

**settings.py:**

    ...

    magicVar = "initValue"

**0002_init:**

    ...

    def change_magicVar(apps, schema_editor):

        settings.magicVar = "newValue"

    ...

    

    operations = [

        migrations.RunPython(change_magicVar),

    ]

    ...

**0003_changed_migrations:**

    ...

    def print_magicVar(apps, schema_editor):

       # Yay! It prints the correct value

       print (settings.magicVar) # prints: newValue

    ...

    

    operations = [

       migrations.RunPython(print_magicVar),

       migrations.CreateModel(

         name='MagicModel',

            fields=[

                ('someMagic', 

                   models.ForeignKey(

                      # Oops! This still has the old value, i.e *initValue*

                      # I want to achieve the *newValue* here!

                      default=settings.magicVar,

                      ... 

        )),

I want the changed value in migrations, but it looks like the value is already been cached.

Does django provide an abstraction to refresh the migrations cache and put a new value in it? If not, what possible options do i have to achieve that value in the defaults?

**Note:** I am trying to avoid this solution[3] because my database might give millions of records and iterating over them isn't ideal.

For external reasons i am also trying to avoid django-livesettings[2]

Thank You

Ajay Tripathi

P.S: Find formatted version of the question on stack overflow here[1].

---

[1]: https://stackoverflow.com/questions/52459208/django-change-settings-value-during-run-time-in-migrations

[2]: https://django-livesettings.readthedocs.io/en/latest/about.html

[3]: https://stackoverflow.com/a/40601025/6410464

[Jason]

You can't do it this way, unfortunately.  I would suggest you use https://github.com/jazzband/django-constance instead

[Ajay Tripathi]

Hi Jason,

You can't do it this way, unfortunately.  I would suggest you use https://github.com/jazzband/django-constance instead

Thanks, It helped me.

Cordially,

Ajay Tripathi (atb00ker)