When to use save
- when creating a new record.
- you have a model instance already, and you need to change some field values.
- you've overridden the save() method to include some custom model logic.
- you defined pre_save and post_save signals for that model.
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The ".save()" method is used to write a model instance to the database. It can be an existing record or even a new one. For an existing record, Django will run a SQL UPDATE statement on the database. For a new record, Django will run an INSERT.
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