具有nm关系数据的PostgreSQL / PostGIS ST_AsGeoJSON

Question

我正在尝试从数据库中以JSON格式查询数据：

+---------room table-------+
| shapeid | geom | surface |
+--------------------------+
|    1    | xxxxx|  50m2   |
|    2    | xxxxx|  25m2   |        

+-------users table---------+
| userid  | name | position |
+---------------------------+
|    1    | fred  | teacher |
|    2    | timmy | student |

+----------roomusers table-------+
| roomuserid  | shapeid | userid |
+--------------------------------+
|      1      |    1    |    1   |
|      2      |    2    |    1   |
|      3      |    2    |    2   |

我通过以下查询设法获得了桌子上的所有房间：

SELECT jsonb_build_object(
    'type',     'FeatureCollection',
    'features', jsonb_agg(feature)
)
FROM (
  SELECT jsonb_build_object(
    'type',       'Feature',
    'id',         shapeid,
    'geometry',   ST_AsGeoJSON(ST_TRANSFORM(geom,4326))::json,
    'properties', to_jsonb(row)
  ) AS feature
  FROM (SELECT * FROM rooms) row) features;

其结果如下：

{
   "type":"FeatureCollection",
   "features":[
      {
         "id":1,
         "type":"Feature",
         "geometry":{
            "type":"MultiPolygon",
            "coordinates":[
               "xxxxxx"
            ]
         },
         "properties":{
            "geom":"xxxxx",
            "shapeid":1,
            "surface":"50m2"
         }
      }
}

但是，我也想为每个功能都提供一个额外的数组，其中包含每个房间用户的数据，而Im在这里完全丢失了。