unbound method save() must be called with MyModel instance as first argument

[Tom Tanner]

I'm using `setattr()` to set attributes of a new object of a Django model.

    obj = apps.get_model(app_label="theme", model_name="MyModel")
    setattr(obj,"myCol",100)
    obj.save()

I got this error: `TypeError: unbound method save() must be called with DataPopulationTracts2016 instance as first argument (got nothing instead)`.

I want to save the new instance of `MyModel` to the model, using `get_model()` and `setattr()` to make a new instance of the model and set its attributes. How do I make `get_model()` and `setattr()` work with `save()`?

[Costja Covtushenko]

Hi,

It looks like with get_model() you’ve gotten Model class not Model instance.

You can use `save()` on instance only.

You need to have something like:

class_ = get_model(…)

instance = class_()

instance.save()

I hope that make sense to you.

Regards,

C.

On Jan 23, 2018, at 7:43 PM, Tom Tanner <dontsende...@gmail.com> wrote:

get_model

[Tom Tanner]

In my case, I'm using `setattr()` because I need to access a field via string and set it. I can't do `obj.myCol = "blah blah"` because this whole code is part of a `manage.py` command I'm setting up that asks the user to input the name of the model and column they want to add a new record for.

[Costja Covtushenko]

Hi,

I did not mention your use of `stattr()`.

I was about class VS instance of that class.

Did you say that problem is with unbound method `save()` which should be called with instance as a first argument?

Regards,

C

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[Costja Covtushenko]

Also it looks like in your separate tread Daniel wrote:

> model_instance = model()

That is how you can create instance from model.

Regards,

C