field cannot be specified for model form as it is a non-editable field

Hi.

After upgrading to 1.11 I'm getting this error:

FieldError: created_at cannot be specified for <MyModel> model form as it is a non-editable field.

First of all, the model contains created_at field declared as DateTimeField(auto_now_add=True). Probably that's why it is non-editable. But I cannot set editable=True - the change has no effect.

My application allows overriding "created_at" value, because there are more than one separate input channels, and I have such cases. Other relies on auto_now_add. 

I want to leave auto_now_add=True as is, and have possibility to override it. 

How to achieve that? 

PS. Somebody asked me why I'm considering leaving Django, and this is a real example of worst changes in Django in last years. Breaking compatibility and blocking a dev to do what he want. There is nothing wrong with overriding such value.

Marcin

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