Looks like we are getting past the "GeoServer's filter parameter parsing
process" vs XPath question.
Can I get a clarification on how MongoDB works: should it be publishing
these as "properties.intProperty" or just "intProperty"?
--
Jody Garnett
On 6 July 2015 at 08:23, Stefano Costa <stefano.co...@geo-solutions.it>
wrote:
> Hi all,
> first of all, a bit of context: with the new MongoDB community plugin,
> it is possible to map as (simple) attributes properties that are nested
> inside JSON objects.
>
> E.g., from a collection containing documents with the following
> structure:
>
> {
> "geometry" : {
> "type" : "Point",
> "coordinates" : [ 2, 2 ]
> },
> "data" : {
> "intProperty" : 2,
> "doubleProperty" : 2.2,
> "stringProperty" : "two"
> }
> }
> the default schema mapper would map the three nested properties of the
> "data" object to three attributes named "properties.intProperty",
> "properties.doubleProperty" and "properties.stringProperty".
>
> In theory, it should be possible to apply CQL filters to the value of
> such attributes, like "data.stringProperty LIKE 't%'": however, when the
> filter is passed as a request parameter in a WMS request to GeoServer,
> it doesn't work.
> The reason is that "properties.doubleProperty" is translated to
> "properties/doubleProperty" by ECQLCompiler (invokes
> ECQLFilterBuilder.buildCompoundAttribute() passing it '/' as attribute
> path separator), which makes the property a complete stranger to mongo
> datastore's collection mapper.
> The issue passed unnoticed through unit tests because the test code
> builds filters simply by invoking methods on a FilterFactory2
> implementation and doesn't go through GeoServer's filter parameter
> parsing process, so ECQLCompiler never comes into play.
>
> Now, I could easily fix the issue replacing '/' with '.' when a
> PropertyName filter is visited, but first I'd be interested to know if
> there's a good reason for the behavior of ECQLCompiler (and also
> CQLCompiler, it seems), which at first sight seems a bit odd, at least
> to me.
>
> Any comment is highly appreciated.
>
>
> --
>
> Best regards,
> Stefano Costa
>
> ==
> GeoServer Professional Services from the experts! Visit
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>
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