On Thu, Jul 3, 2014 at 7:02 AM, Tim Graham <[email protected]> wrote:
> Another suggestion: could you include the field on the form but use a
> HiddenInput widget?

I could, but originally I wanted to avoid this. The container_id
should not be editable by the user. Including this in the form seems
to make a statement against this. I could experiment making this
readonly so the form validates that the value is unchanged. But in the
end, this seems to be a workaround to implement my original
suggestion. That is, when instantiating the formset, pass a dictionary
of "static" fields and their data, that are not rendered as part of
the form HTML, but could be used in:

* Default queryset (could always be overridden)
* Creating new instances
* Validating form data

I suppose readonly hidden inputs would achieve the same effect, but it
seems there is no need for the data to be a part of the rendered HTML
form.

I'll play around with this, thanks for the suggestion.

> I think in your case you
> should call model.full_clean() after form validation and handle any unique
> errors there…

I experimented with this, but this will not work. The method
model.full_clean() validates against the database. But the form needs
to validate against unsaved data. I imagine this is why
BaseModelFormSet.validate_unique() was written in the first place.

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