$queryProps property for Eloquent Model with example.

Model.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model as BaseModel;

/**
 * Class Model
 */
abstract class Model extends BaseModel
{

    /** @var array $queryProps */
    protected $queryProps = [];

    /**
     * @param string $key
     * @return mixed
     */
    public function __get($key)
    {
        if (in_array($key, $this->queryProps)) {
            return call_user_func([$this, $key])->get();
        }

        return parent::__get($key);
    }

}

Store.php

<?php

namespace App\Models;

use App\Model;

/**
 * Here is some example file for usage
 */
class Store extends Model implements StoreInterface
{
  
    /**
     * @see \App\Model::__get
     * @var array $queryProps */
    protected $queryProps = [
        'customers',        // $store->customers = Eloquent Collection of Customer
        'orders',           // $store->orders = Eloquent Collection of Order
        'listings',         // $store->listing = Eloquent Collection of Listing
        // Scope Queries may also be called this way
        'visitable'         // $store->visitable = Eloquent Collection of Store
    ];

    /**
     * @return \Illuminate\Database\Eloquent\Builder
     */
    public function customers()
    {
        // return Customer::select('customers.*')->where('...');
    }

    /**
     * @return \Illuminate\Database\Eloquent\Builder
     */
    public function orders()
    {
        // return Order::select('orders.*')->where('...');
    }

    /**
     * @return \Illuminate\Database\Eloquent\Builder
     */
    public function listings()
    {
        // return Listing::select('listings.*')->where('...');
    }
    
    /**
     * @return \Illuminate\Database\Eloquent\Builder
     */
    public function scopeVisitable($query)
    {
        // return $query->whereNotNull('location_id');
    }

}