Re: Looking for a code that separates fields while applying migrations

[Adam Johnson]

See alte_field in the schema editor: https://github.com/django/django/blob/f4e72e6523e6968d9628dfbff914ab57dbf19e6b/django/db/backends/base/schema.py#L811

It steps through what has changed in the field and generates SQL for the database relevant changes, queueing up statements with self.execute. Any non-SQL changes are basically ignored.

Field.non_db_attrs tracks the field attributes rhat don’t affect SQL: https://github.com/django/django/blob/f4e72e6523e6968d9628dfbff914ab57dbf19e6b/django/db/models/fields/__init__.py#L142 . Note they may be modified by field subclasses, such as inDjango-MySQL’s EnumField.

On Sat, Sep 30, 2023, at 3:57 PM, Akash Sen wrote:

Hello everyone,

There are certain attributes in a field, after changing these the migration generated willbe applied to database, (for example take foreignkey) like null=True or db_default=1. As they have something to do with the database column.

There are some other attributes after changing these the migration generated will not be applied to database, like on_delete. As currently they have nothing to do with the database column.

In search of the code that takes care of that. Some help would be great!

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[Akash Sen]

This one worked :   SQL: https://github.com/django/django/blob/f4e72e6523e6968d9628dfbff914ab57dbf19e6b/django/db/models/fields/__init__.py#L142 .

Thank you Adam.

[Remy Lukoo Hangi]

Fais-moi le setup.exe de python django suis débutant

[Michiel Beijen]

On 28 Nov 2023, at 13:00, Remy Lukoo Hangi <remyluk...@gmail.com> wrote:
>
> Fais-moi le setup.exe de python django suis débutant
>

Hi Remy,

You found the developers email list for Django. Actually the email lists are not really used anymore, and you should use the ‘forums’ instead —> https://forum.djangoproject.com/c/users/6

However, there is no ‘setup.exe’ for Django, it does not really work that way. You’d be best off by reading the documentation here closely:
https://docs.djangoproject.com/en/4.2/intro/install/

Django is regarded as having good documentation and a comprehensive tutorial.

I hope this helps,

—
Michiel