Presentation -- Monday, May 23 -- django

presentation.md

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Model instance reference (Create, Refresh, Delete, _state)

Moderator: Javier Buzzi

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Create

link

Model.objects.create(property1=value1, property2=value2)

m = Model(property1=value1, property2=value2)
m.save()

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• Whats happening under the hood?
• Whats happens to the related objects?
• What happens if the object is already in the database?

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Refresh

link

m.refresh_from_db()

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code

• Whats happening under the hood?
• Whats happens to the related objects?
• What happens if the object is not in the database?

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Delete

link

m.delete()

Model.objects.filter(id=m.id).delete()

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code / code

• Whats happening under the hood?
• Whats happens to the related objects?
• What happens if the object is not in the database?

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_stage

link

m._state

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code

• Whats happening under the hood?
• Why is it important?
• What happens if it's m.pk is None and m._state.adding is False?

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Thank you!