baoshi-was/app/Warehouse.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use App\Traits\ModelTimeFormat;

use App\Traits\ModelLogChanging;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Warehouse extends Model
{
    use ModelLogChanging;

    use ModelTimeFormat;
    protected $fillable=['name','code',"production_capacity","reduced_production_capacity_coefficient","address","principal","phone","province_id","city_id","county_id"];

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

    public function province()
    {   //省
        return $this->belongsTo(Region::class)->where("type",1);
    }
    public function city()
    {   //市
        return $this->belongsTo(Region::class)->where("type",2);
    }
    public function county()
    {   //区县
        return $this->belongsTo(Region::class)->where("type",3);
    }

    /**
     * @return HasMany
     */
    public function laborCompanies(): HasMany
    {
        return $this->hasMany(LaborCompany::class,'warehouse_id','id');
    }
}