QGIS/resources/function_help/json/order_parts

{
  "name": "order_parts",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Orders the parts of a MultiGeometry by a given criteria",
  "arguments": [
    {"arg":"geometry","description":"a multi-type geometry"},
    {"arg":"orderby","description":"an expression string defining the order criteria"},
    {"arg":"ascending","optional":true,"default":"true","description":"boolean, True for ascending, False for descending"}
  ],
  "examples": [
    {
      "expression":"geom_to_wkt(order_parts(geom_from_wkt('MultiPolygon (((1 1, 5 1, 5 5, 1 5, 1 1)),((1 1, 9 1, 9 9, 1 9, 1 1)))'), 'area($geometry)', False))",
      "returns":"'MultiPolygon (((1 1, 9 1, 9 9, 1 9, 1 1)),((1 1, 5 1, 5 5, 1 5, 1 1)))'"
    },
    {
      "expression":"geom_to_wkt(order_parts(geom_from_wkt('LineString(1 2, 3 2, 4 3)'), '1', True))",
      "returns":"'LineString(1 2, 3 2, 4 3)'"
    }
  ]
}