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I toggle editing on a layer, open the attribute table -> Field Calculator -> Check 'Update Existing Field' -> Select 'myfield' in dropdown -> type...

myfield / 60

-> Hit 'Ok' -> Save Edits -> Stop Editing

The changes seem to appear in the attribute table, but when I close the attribute table and re-open, the changes are gone. When I export the result to geojson, the changes aren't there either.

Any ideas on how to persist these edits short of making a new field? This is on QGIS 3.4 Madeira, Windows 10.

EDIT: I cannot even persist changes in a new field: the result is all null

enter image description here

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    What vector format are you using, what are the field types of AS_Time and AS_Minute? Also have you tried to use "AS_Time" / 60?
    – ahmadhanb
    Feb 14, 2019 at 8:57
  • You can try to_int( "AS_Time" ) / 60. However, it would be highly suggested accomplishing everything that was suggested by @ahmadhanb.Problem is probably about the field type either "AS_Time" or "AS_Minutes".
    – Taras
    Feb 14, 2019 at 9:11

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Are you running Field calculator on geosjon? It could be related to a bug discussed here: latest version of QGIS fails to edit attribute table of GeoJSON file

QGIS bug is still open today, here: https://issues.qgis.org/issues/20760#change-97363

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