[Developers] query for empty properties?

[Jason Douglas]

This seemed to do exactly what I wanted:

/type/reflect/any_master: {
	"link" : property,
	"optional" : "forbidden"
}

-jason

On Aug 20, 2008, at 11:41 PM, Kurt Bollacker wrote:

>
> On Thu, Aug 21, 2008 at 12:39:52AM -0400, Christopher R. Maden wrote:
>> Jason Douglas wrote:
>>> I want to get only the objects that don't have a specific property
>>> filled in (expected type is an object).  Is there a way to do that?
>>
>> "property":{"id":null,"optional":"forbidden"}
>>
>> should do it.  No?
>
> I take it back. I was oversimplifying the problem.  Consider the
> query:
>
> [
>  {
>    "*" : null,
>    "/people/person/parents" : {
>      "id" : null,
>      "optional" : "forbidden"
>    },
>    "limit":1,
>    "type" : "/people/person"
>  }
> ]
>
> which will return someone whose parents we do not know.  However, I
> will point out that this is not reliable because MQL is doing the
> query-then-filtering as I mentioned you needed to do manually. For
> example, the query:
>
> [
>  {
>    "*" : null,
>    "/type/object/name" : {
>      "optional" : "forbidden",
>      "value" : null
>    },
>    "limit":1,
>    "type" : "/people/person"
>  }
> ]
>
> is the same shape as the one above, but people without names are very
> rare, so this query times out.  So what I should have said is that the
> only *reliable* way to find topics without a specific property is to
> query (possibly with cursors), and then filter externally to MQL.
>
> 								Kurt :-)
>
>
>
>
>> ~Chris
>> -- 
>> Christopher R. Maden
>> Data Architect
>> Freebase.com: <URL: http://www.freebase.com/ >
>> Metaweb Technologes, Inc. <URL: http://www.metaweb.com/ >
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