[postgis-tickets] [PostGIS] #5118: DropTopology: ERROR: update or delete on table "topology" violates foreign key constraint "layer_topology_id_fkey" on table "layer"

[PostGIS]

#5118: DropTopology: ERROR:  update or delete on table "topology" violates foreign
key constraint "layer_topology_id_fkey" on table "layer"
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.3.0
 Component:  topology  |    Version:  3.2.x
Resolution:            |   Keywords:
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Comment (by strk):

 Got it: the NOTICE should probably be an EXCEPTION in that it *prevents*
 deleting from topology.layer if records still exist in the relation table:
 {{{
 xxx=# delete from topology.layer where topology_id = 17 and layer_id = 1;
 NOTICE:  A record in city_data.relation still references layer 1
 DELETE 0
 }}}

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5118#comment:6>
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