Re: Non-empty list validator in schema

Graham Stratton wrote:
> Hi,
> 
> I want to validate a non-empty list of integers as part of a
> schema.  The validation works provided that a key exists in the data for
> the list, but if it doesn't exist the validator return an empty list:
> 
> 
>>>> class S(Schema):
>>>>
> ...   a = formencode.ForEach(formencode.validators.Int(),  
> not_empty=True)
> ...
> 
> 
>>>> S.to_python({'a':None})
>>>>
> formencode.api.Invalid: a: Please enter a value
> 
> 
>>>> S.to_python({})
>>>>
> {'a': []}
> 
> I've tried setting other parameters, but I can't work out what to do  
> about
> this.  Any help would be greatly appreciated.

It's the not_empty=True that's raising the error.  But when there's no 
value at all, if_missing is what comes into play.  Usually this is set 
to formencode.api.NoDefault, which causes the Schema to raise an error. 
  But for ForEach it is set to [].


-- 
Ian Bicking | [email protected] | http://blog.ianbicking.org
             | Write code, do good | http://topp.openplans.org/careers

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