在 Laravel Eloquent 中获取 HasOne 关系中的特定列

Question

Edit: Updated to hasOne in both classes

I have two tables, Store and Address . One Store has one address and one address is associated with only one store.

In my Store model, I have a hasOne relationship.

public function store_address(): HasOne
{
    return $this->hasOne(Address::class, 'id', 'address_id');
}

And in Address model I have a hasOne :

public function store(): HasOne
{
    return $this->hasOne(Store::class, 'id', 'store_id');
}

Now I want to join these two tables using Eloquent with() with select * from store but want specific columns from the address table.

Store::where('user_id', $user_id)
      ->select(\DB::raw('*')
      ->with(['store_address' => function($query) {
          return $query->select(['distance_to_user as distance']);
      }])
      ->orderBy('distance');

However it's not returning the correct distance from the address table. How can I do that?

This is the error message I get:

Column not found: 1054 Unknown column 'distance' in 'order clause' (SQL: select *, from `store` where `store`.`user_id` = 12 and `store`.`deleted_at` is null order by `distance` asc)

Answer 1

I assume the structure of your tables

Addresses:

id | store_id| body | distance_to_user
----------------------------------------
 1 | 1       |China | 100

and for Stores:

id | name
--------------
 1 | Store_01

You should have Models like:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Address extends Model
{
    //

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

and

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Store extends Model
{
    //
    public function address()
    {
        return $this->hasOne('App\Address');
    }
}

now in your controller:

        public function index()
        {
            //return Store::with(['address' => function($q){
            //    $q->select('distance_to_user as distance','store_id');
            //    }])->get();


            return Store::leftJoin('addresses', 'addresses.store_id', '=', 'stores.id')


                 ->select('stores.id','stores.name','distance_to_user as distance')

                // OR use ->select('stores.*','addresses.id as address_id','distance_to_user as distance')

                ->orderBy('distance','Desc')

                ->get();
        }