我在Sequelize中有一个位置模型

var Sequelize = require('sequelize');

module.exports = function(sequelize, DataTypes) {
   var Location = sequelize.define('Location', {
      location_id: {
         type: Sequelize.STRING,
         primaryKey: true
      },
      location_code: {
         type: Sequelize.STRING,
         allowNull: true
      },
      location_name: {
         type: Sequelize.STRING,
         allowNull: true
      },
      latitude: {
         type: Sequelize.STRING,
         allowNull: true,
         defaultValue: null
      },
      longitude: {
         type: Sequelize.STRING,
         allowNull: true,
         defaultValue: null
      },
      location: {
         type: Sequelize.GEOMETRY('POINT'),
         allowNull: true
      }
   });
   return Location;
};

我通过喂入纬度和经度到位置

var location = { type: 'Point', coordinates: [latitude, longitude] };

我有一个将纬度和经度作为参数的路由器.我需要在“位置”表中找出所提供的经度/纬度与所有位置之间的距离.

我该怎么做呢？ Sequelize是否已经为我提供了确定距离的功能,还是需要编写外部查询来查找距离？

谢谢.

解决方法:

您不需要纬度和经度属性,它们将存储在您的位置属性中.
要查找小于10000米的距离的地点,可以使用以下方法：

    var lat = parseFloat(json.lat);
    var lng = parseFloat(json.lng);
    var attributes = Object.keys(Location.attributes);
    var location = sequelize.literal(`ST_GeomFromText('POINT(${lng} ${lat})')`);
    var distance = sequelize.fn('ST_Distance_Sphere', sequelize.literal('location'), location);
    attributes.push([distance,'distance']);

    Location.findAll({
      attributes: attributes,
      order: 'distance',
      where: sequelize.where(distance, {$lte: 10000}),
      logging: console.log
    })
    .then(function(instance){
      return res.json(200, instance);
    })