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In addition to adding/deleting/modifying field to model, Django also detects changes when I add or modify methods to the model.
So my question is should I run makemigrations every time I change or add a new method in models ?
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When to run makemigrations. You'll want to run python manage.py makemigrations w henever you make a change to a model, even if it is updating the description on a field. Adding or updating functions inside of a model does not need a migration, but you can still run makemigrations just in case.
makemigrations is responsible for packaging up your model changes into individual migration files - analogous to commits - and migrate is responsible for applying those to your database.
When you add/change model methods, then you don't need to run ./manage makemigrations and ./manage.py migrate.
But whenever you edit your model fields (adding a new one, changing an existing one or altering any of the arguments it takes) then you should always run migrations.
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