Why do you want to do this?

Reference fields include the IS_IN_DB validator by default. 

I guess you could make it a plain integer field and use 
requires=IS_EMPTY_OR(IS_IN_DB(db, ...))

On Monday, December 16, 2013 12:28:14 PM UTC-5, Phil Hughes wrote:
>
> I have some reference fields in a table and I want to be able to allow 
> them to be null (for a while. I have sent notnull and required to False in 
> the model but I get an error when I go to create a record in appadmin. 
> Clearly I can set them to point to a dummy record in my application but I 
> am wondering if there is a "right way" to make this work.
>

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