Is it possible to instantiate a model (create an object) and flag the instance as unsaveable?

[Bernd Wechner]

I'd like to instantiate a model, and play around with it, but ensure it's never saved. At bare minimum instantiate it, play around with it then delete it, but ideally disable saving somehow. I imagine I can override save() on the instance, but am wondering if anyone has experience doing this or if there's a canonical method for doing it. I'll experiment but in the mean time fishing as I said for experience and any standard methods out there.

Regards,

Bernd.

[James Bradshaw]

Hey Bernd,

I'm curious about your use case. It's common to create a read-only database user to make sure no data is modified, but I've never come across anything at the instance/row level.

-Jimmy

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[James Schneider]

On Sat, Jun 2, 2018, 6:14 PM Bernd Wechner <bernd....@gmail.com> wrote:

I'd like to instantiate a model, and play around with it, but ensure it's never saved. At bare minimum instantiate it, play around with it then delete it, but ideally disable saving somehow. I imagine I can override save() on the instance, but am wondering if anyone has experience doing this or if there's a canonical method for doing it. I'll experiment but in the mean time fishing as I said for experience and any standard methods out there.

One way to make an obvious indication that the model instance is read-only is to use a proxy model of the original, with all the saving bits turned off. Keeps a nice separation of code while utilizing inheritance, and allows usage of the original/standard behavior.

IMO, overriding the save() method in the proxy model is probably the cleanest way to prevent an accidental save by a signal, etc.

https://docs.djangoproject.com/en/dev/topics/db/models/#proxy-models

-James

[Bernd Wechner]

Thanks James, I like that idea. I'll experiment with it. Have used Proxies before just not with this in mind.