README

ActiveRecord with spatial attributes. Those attributes are transformed from the internal MySQL format to GeoJSON format after finding, and vice versa before storing.

Yii2-spatial can also be used to find the model or models which are nearest to a given location.

Notice that this extension is intended to be used with a MySQL or MariaDB database exclusively.

Version 1.1.0 is compatible with MySQL 5.7 and MariaDB 10.3.

Installation

Install Yii2-spatial with Composer. Either add the following to the require section of your composer.json file:

"sjaakp/yii2-spatial": "*"

Or run:

composer require sjaakp/yii2-spatial "*"

You can manually install Yii2-spatial by downloading the source in ZIP-format.

Usage

Simply use a sjaakp\spatial\ActiveRecord as base class for your models, like so:

<?php

use sjaakp\spatial\ActiveRecord;

class MySpatialModel extends ActiveRecord
{
    // ...
}

Notice: if you override find() in a sjaakp\spatial\ActiveRecord-derived class, be sure to return a sjaakp\spatial\ActiveQuery and not an 'ordinary' yii\db\ActiveQuery.

ActiveRecord method

featureProperties()

public function featureProperties($field, $geometry)

Override this function to add properties to the GeoJSON encoded attribute.

• $field is the attribute name.
• $geometry is an array with the GeoJSON-information, like decoded JSON.
• Return: array of property => value.

The default implementation adds the ActiveRecord's primary key as the property 'id'.

ActiveQuery method

nearest()

public function nearest($from, $attribute, $radius)

Change the query so that it finds the model(s) nearest to the point given by $from.

• $from - string|array
  • string: GeoJSON representation of search Point or Feature.
  • array: location in the form [<lng>, <lat>] (two floats).
• $attribute - string attribute name of Point in the model.
• $radius - number search radius in kilometers. Default 100.
• Return: $this.

Example usages:

$here = [4.9, 52.3];     // longitude and latitude of my place

$here2 = '{"type":"Point","coordinates":[4.9,52.3]}';	// another representation
 

$nearestModel = <model>::find()->nearest($here, <attributeName>, 200)->one();    // search radius is 200 km

$fiveNearestModels =  <model>::find()->nearest($here, <attributeName>)->limit(5)->all();	// search radius is 100 km (default)

$dataProvider = new ActiveDataProvider([ 'query' => <model>::find()->nearest($here, <attributeName>) ]);

Thanks

• fpolito for finding a very subtle bug.