[Qgis-developer] Getting access to atlas record

[Nyall Dawson]

On 19/06/2014 11:56 pm, "Andreas Neumann" <a.neumann at carto.net> wrote:
>
> Hi,
>
> Question: is it already possible to get access to any attribute in the
> current atlas feature record?
>

Hi Andreas,

I've been working on this. I nearly had it ready for 2.4, but in the
end I wasn't comfortable pushing it late in the development cycle.
What I've done is:

- Add an "$atlasfeature" variable, which returns the current atlas feature
- Add a "$currentfeature" variable, which returns the current feature
which is being evaluated (unfortunately $feature is already used for
the current atlas feature NUMBER, which is an issue for a separate
email!)
- Add an "attribute( feature, column )" function, which returns the
value stored in the specified column for a given feature

This allows you to do an expression like:
"area_code" = attribute($atlasfeature, 'area_code')

Or, you can do neat things like label a column using an expression to
choose the column name!..
attribute( $currentfeature, "label_column" )

Hopefully I can push this soon after master is unfrozen.

Nyall