source: app/Models/Post.php

<?php

namespace App\Models;

use Carbon\Carbon;
use Illuminate\Support\Str;
use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
        protected $table = "posts";

        protected $fillable = ["title", "image_link", "content", "user_id", "category_id"];

        public function user() {
                return $this->belongsTo(User::class);
        }

        public function review() {
                return $this->hasOne(Review::class);
        }

        public function needReview()
    {
        return PostSecurity::whereRoleId($this->user->role->id)->first();
    }

        public function category() {
                return $this->belongsTo(Category::class);
        }

        public function tag()
        {
                return $this->belongsToMany(Tag::class, "posts_tags");
        }

        public function comment() {
                return $this->hasMany(Comment::class);
        }

        public function like()
        {
                return $this->hasMany(Like::class);
        }

        public function getConfirmedBy() {
                return User::find($this->confirmed_by)->getFullName();
        }

        public function ago() {
                return Carbon::parse($this->created_at)->diffForHumans();
        }

        public function createSlug($isEdit = false) {

                $newSlug = Str::slug($this->title);
                $slugs = Post::pluck("slug");

                if($isEdit) {
                        return $newSlug;
                }

                if($slugs->contains($newSlug)) {
                        $id = $this->latest("id")->first()->id + 1;
                        $newSlug = $newSlug . "-" . $id;
                }

                return $newSlug;
        }

        public function isLiked($ipAddress) {

                $likes = $this->like->all();

                foreach($likes as $like) {
                        if($this->id == $like->post_id && $ipAddress == $like->ip_address) {
                                return true;
                        }
                }

                return false;
        }
}