[mapserver-users] Selecting data from multiple OGR layers

[Iljya Kalai]

This worked - thank you!

I was going to update the documentation, but by the time I woke up, Jeff
had beat me to it
<https://github.com/MapServer/MapServer-documentation/commit/0e7c9da79514659b1c879e0fabc91c8104902c04>
 :)

Em qua., 3 de fev. de 2021 às 19:16, Tamas Szekeres <szekerest at gmail.com>
escreveu:

> Iljya,
>
> You might probably try Union_SourceLayerName as the attribute name.
>
> Best regards,
>
> Tamas
>
>
>
>
> Iljya Kalai <iljya.kalai at gmail.com> ezt írta (időpont: 2021. febr. 3.,
> Sze, 18:54):
>
>> Hi everyone,
>>
>> I'm trying to select data from multiple OGR layers and style them based
>> on the source layer, as well as some attributes that are not common to all
>> layers.
>>
>> I discovered the UNION layer
>> <https://mapserver.org/mapfile/union.html#union> which seems to be the
>> answer. According to the documentation
>> <https://mapserver.org/mapfile/union.html#union> the source layer name
>> should be in the [Combine_SourceLayerName] attribute. However, I get
>> this error when I try to use it:
>>
>>    msOGRLayerInitItemInfo(): OGR error. Invalid Field name:
>> Combine_SourceLayerName in layer `LAYER1'
>>
>>  (I also tried [Union:SourceLayerName] which I found in the mapunion.c
>> code
>> <https://github.com/MapServer/MapServer/blob/0f7bbf67ce7c6fec0feaa0b33033daf02e406b9b/mapunion.c#L39>,
>> but that gives the same error.)
>>
>> Map file snippet:
>>
>> LAYER
>>     NAME "U"
>>     STATUS DEFAULT
>>     CONNECTIONTYPE UNION
>>     CONNECTION "LAYER1,LAYER2"
>>     CLASS
>>        NAME "C1"
>>        EXPRESSION ("[Combine_SourceLayerName]" = "LAYER1")
>>        ...
>>
>> Any ideas?
>>
>> Thanks!
>> Iljya
>> P.S I'm new here!
>> _______________________________________________
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>> mapserver-users at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/mapserver-users
>>
>
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