Laravel中两点之间的Haversine距离计算 [英] Haversine distance calculation between two points in Laravel

问题描述

我正在研究laravel应用程序，其中我需要找到用户坐标一定半径内的所有产品.产品与用户具有一对多的关系，因此用户可以拥有多个产品.

I'm working on a laravel appliciation in which I need to find all the products that are within a certain radius of the user's coordinates. Products have a one to many relationship with users, so users can have multiple products.

我发现Haversine公式可以计算两点之间的距离，但是我似乎无法使它起作用.

I've found that the haversine formula can calculate the distance between two points, but I can't seem to make it work.

我的控制器中有以下查询:

I've got the following query in my controller:

$latitude = 51.0258761;
$longitude = 4.4775362;
$radius = 20000;

$products = Product::with('user')
->selectRaw("*,
            ( 6371 * acos( cos( radians(" . $latitude . ") ) *
            cos( radians(user.latitude) ) *
            cos( radians(user.longitude) - radians(" . $longitude . ") ) + 
            sin( radians(" . $latitude . ") ) *
            sin( radians(user.latitude) ) ) ) 
            AS distance")
->having("distance", "<", $radius)
->orderBy("distance")
->get();

出于测试目的，我已将半径设置为20000，看来所有产品的距离均为5687. 问题似乎是产品的纬度和经度存储在User表中，但是我不确定如何在查询中访问这些产品.我尝试了 user.latitude 和'user-> latitude'，但似乎没有任何效果.

I've set the radius to 20000 for testing purposes and it appears all products have a distance of 5687,.. The problem seems to be that the latitude and longitude of the products are stored in the User table, but I'm not sure how I can access those in my query. I've tried user.latitude and 'user->latitude' but nothing seems to work.

这是我的模特:

产品型号

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product extends Model
{
    protected $fillable =
        [
            'soort',
            'hoeveelheid',
            'hoeveelheidSoort',
            'prijsPerStuk',
            'extra',
            'foto',
            'bio'


        ];

    public function User()
    {
        return $this->belongsTo('App\User');
    }

    public $timestamps = true;
}

用户模型

namespace App;

use Illuminate\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Auth\Passwords\CanResetPassword;
use Illuminate\Foundation\Auth\Access\Authorizable;
use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Contracts\Auth\Access\Authorizable as AuthorizableContract;
use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;

class User extends Model implements AuthenticatableContract,
                                    AuthorizableContract,
                                    CanResetPasswordContract
{
    use Authenticatable, Authorizable, CanResetPassword;

    protected $table = 'users';

    protected $fillable = 
        [
        'firstName', 
        'lastName', 
        'adres',
        'profilepic',
        'description', 
        'longitude',
        'latitude',
        'email', 
        'password'
    ];

    protected $hidden = ['password', 'remember_token'];

    public function product()
    {
        return $this->hasMany('App\Product');
    }
}

推荐答案

这是我的实现.我选择提前为查询加上别名，这样我就可以利用Pagination的优势.此外，您需要明确选择要从查询中检索的列.将它们添加到->select().例如users.latitude, users.longitude, products.name或它们可能的任何形式.

This was my implementation of it. I've chosen to alias my query out ahead of time, this way I can take advantage of Pagination. Furthermore, you need to explicitly select the columns that you wish to retrieve from the query. add them at the ->select(). Such as users.latitude, users.longitude, products.name, or whatever they may be.

我创建了一个看起来像这样的范围:

I have created a scope which looks something like this:

public function scopeIsWithinMaxDistance($query, $location, $radius = 25) {

     $haversine = "(6371 * acos(cos(radians($location->latitude)) 
                     * cos(radians(model.latitude)) 
                     * cos(radians(model.longitude) 
                     - radians($location->longitude)) 
                     + sin(radians($location->latitude)) 
                     * sin(radians(model.latitude))))";
     return $query
        ->select() //pick the columns you want here.
        ->selectRaw("{$haversine} AS distance")
        ->whereRaw("{$haversine} < ?", [$radius]);
}

您可以将此范围应用于具有latitude和longitude的任何模型.

You can apply this scope to any model with a latitude andlongitude.

将$location->latitude替换为要搜索的latitude，然后将$location->longitude替换为希望搜索的经度.

Replace the $location->latitude with your latitude that you wish to search against, and replace the $location->longitude with the longitude that you wish to search against.

根据$radius中定义的距离，将model.latitude和model.longitude替换为希望在$location周围找到的模型.

Replace the model.latitude and model.longitude with the Models you wish to find around the $location based on the distance defined in the $radius.

我知道您有一个有效的Haversine公式，但是如果需要分页，则无法使用您提供的代码.

I know you have a functioning Haversine formula, but if you need to Paginate you can't use the code you've supplied.

希望这会有所帮助.

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