db.command.geoWithin

需对查询字段建立地理位置索引

找出字段值在指定区域内的记录，无排序。指定的区域必须是多边形（Polygon）或多边形集合（MultiPolygon）。

方法签名：

function geoWithin(IOptions): Command

interface IOptions {
  geometry: Polygon | MultiPolygon // 地理位置
}

示例代码

const cloud = require('wx-server-sdk')
cloud.init()
const db = cloud.database()
const _ = db.command
const {Point, LineString, Polygon} = db.Geo
exports.main = async (event, context) => await db.collection('restaurants').where({
  location: _.geoWithin({
    geometry: Polygon([
      LineString([
        Point(0, 0),
        Point(3, 2),
        Point(2, 3),
        Point(0, 0)
      ])
    ]),
  })
})