Project.php

<?php

namespace App;

use Spatie\Sluggable\HasSlug;
use Spatie\Sluggable\SlugOptions;
use Illuminate\Database\Eloquent\Model;

class Project extends Model
{
    use HasSlug;
    use \Spatie\Tags\HasTags;

    protected $casts = [
        'is_completed' => 'boolean',
    ];

    protected $fillable = [
        'title', 'description', 'client_id', 'started_at', 'is_completed', 'slug', 'remarks', 'invoice_prefix'
    ];

    public function path()
    {
        return '/projects/'.$this->id;
    }

    /**
     * Get the options for generating the slug.
     */
    public function getSlugOptions()
    {
        return SlugOptions::create()
            ->generateSlugsFrom('title')
            ->saveSlugsTo('slug');
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function client()
    {
        return $this->belongsTo('App\Client');
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
     */
    public function users()
    {
        return $this->belongsToMany('App\User', 'project_user')
                ->withPivot('user_id')
                ->withTimestamps();
    }

    /**
     * @param $query
     * @return mixed
     */
    public function scopeCompleted($query)
    {
        return $query->where('is_completed', true);
    }

    /**
     * @param $query
     * @return mixed
     */
    public function scopeRunning($query)
    {
        return $query->where('is_completed', false);
    }

    public function bill() {
        return $this->hasMany(Bill::class);
    }
}