Save vs Update in Django - Deepstash

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 databas...

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Save vs Update in Django

helmut.dev

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When updating an existing record, Django will update every field. That means, if you changed only one field on the model instance, all the fields will be updated (with the values staying the same)....

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To prevent updating every field of the model you can use the update_fields parameter. It expects a list of fields that you want to save. The UPDATE that is run against the database then only update...

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  • 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....

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The ".update()" method is available on each queryset object of the ORM. For example, "Toy.objects.filter(price__lt=50).update(price=50)".

This would update the price of all toys that are belo...

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  • you are updating fields of one or many records (note: update cannot be used to create a new record, like save can).
  • you don't need to re-use a model instance after updating.
  • yo...

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