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
==
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Dott. Stefano Costa
Senior Software Engineer
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Italy
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