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BUG: alt.datum does not support nested properties

See original GitHub issue

and those nested properties are typical for topojson/geojson objects; consider example:


boundaries = alt.topo_feature(map_url, 'area')


alt.Chart(boundaries).transform_filter(alt.datum.properties['area_type'] == 'neighborhood').mark_geoshape(fill='red').encode(color='area_id:N').project(
    type="mercator",
    center=[-73.99,40.72]
).properties(width=500,height=300)

Issue Analytics

State:
Created 5 years ago
Comments:10 (6 by maintainers)

Top GitHub Comments

2reactions

Casyfillcommented, Jun 11, 2018

had to workaround with

MAP = alt.Chart(boundaries).transform_calculate(area_type='datum.properties.area_type',).transform_filter(alt.datum.area_type == 'neighborhood')
MAP.mark_geoshape(fill='red').encode(color='area_id:N').project(
    type="mercator",
    center=[-73.99,40.72]
).properties(width=500,height=300)

1reaction

jakevdpcommented, Sep 10, 2019

You can pass any string to a getitem, e.g.

alt.datum['acey-ducey']

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