Is it possible, is it worth it and if “yes”, then how ... in the model, in addition to the field, immediately indicate the possible values ​​\u200b\u200bof this field and write them to the database during migration?

Question

Django

Good afternoon.
For example, there is

class Country(models.Model):
    country_name = models.CharField('Country', max_length = 30)

and i know that in db i need only 3 countries, let's say ireland, hungary and turkey. As far as I understand, only tables and fields are created during migration.
Questions:
1) Is it possible ...
2) Is it worth it ...
3) and if "yes", then how ... when migrating a model, write data to the database immediately?
Thank you.

Answer 1

https://docs.djangoproject.com/en/1.8/ref/models/f...
see choices

Answer 2

you can
https://docs.djangoproject.com/en/1.8/ref/models/f...
it's worth it - the question is to support the normal form of the database
if necessary, and write in the migration the data necessary for the application to work

Answer 3

So, as you already found out, choices are not written to the database - they are stored exclusively in the code and are used by the ORM to validate data and form a list of options in forms, for example, in the Django admin panel.
When the task is set, the following comes to mind:
Use choices and store a list of countries in the project settings - Django settings, this way it will be easier to use the Django ORM features for data validation and data submission in forms. It is worth considering that when adding a new country, you will have to change the settings and restart (reroll) the project.
Then, write the datamigrationto add the countries you need to the database. In such a migration, you can cycle through the country names from the project settings and create all the necessary objects if they have not already been created.