wx.sstbc.com/app/Models/Dialogue.php

<?php

namespace App\Models;

class Dialogue extends SoftDeletesModel
{

    public function user()
    {
        return $this->hasOne(User::class, 'id', 'user_id');
    }

    public function toUser()
    {
        return $this->hasOne(User::class, 'id', 'to_user_id');
    }

    public function supplyDemand()
    {
        return $this->hasOne(SupplyDemand::class, 'id', 'supply_demand_id');
    }

    public function messages()
    {
        return $this->hasMany(Message::class, 'dialogue_id', 'id');
    }

}