Sequelize geospatial query: find “n” closest points to a location

Question

Using Sequelize and geospatial queries, if I want to find the \"n\" closest points to a certain location, how should the Sequelize query be?

Assume I have a model th

Answer 1

MySQL can give an error that function ST_Distance_Sphere does not exist. In that case you can use this alternative solution:

I hold point information separately as latitude and longitude decimals. Assume you should have a model that looks something like this:

sequelize.define('Point', {latitude: DataTypes.DECIMAL(11,2)},
                          {longitude: DataTypes.DECIMAL(11,2)});

Imagine we have a lat and lng variables to define a location, and we want to find the 10 closest points to it:

db.Point.findAll({
  attributes: [[sequelize.fn('POW',sequelize.fn('ABS',sequelize.literal("latitude-"+lat)),2),'x1'],
               [sequelize.fn('POW',sequelize.fn('ABS',sequelize.literal("longitude-"+lng)),2),'x2']], 
  order: sequelize.fn('SQRT', sequelize.literal('x1+x2')),
  limit: 10
});

Update:

With Haversine Formula, distance is more accurate:

db.Point.findAll({
  attributes: [[sequelize.literal("6371 * acos(cos(radians("+lat+")) * cos(radians(latitude)) * cos(radians("+lng+") - radians(longitude)) + sin(radians("+lat+")) * sin(radians(latitude)))"),'distance']],
  order: sequelize.col('distance'),
  limit: 10
});