On Friday, December 16, 2016 at 5:00:10 PM UTC-5, icodk wrote:
>
> Not sure understanding you suggestion
> In which case ?
>

In case you are editing a record and all categories have already been 
assigned, you can set the category field to be read-only rather than 
showing a select widget with only a single option.
 

> available_categories is an unresolved  query until too late 
> Could you please elaborate ?
>

When you're not on the edit page, you can check whether the 
available_categories set is empty, and if so, eliminate the "Add" button.

Anthony

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