BookStack/app/Book.php

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<?php
namespace Oxbow;
class Book extends Entity
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{
protected $fillable = ['name', 'description'];
public function getUrl()
{
return '/books/' . $this->slug;
}
public function getEditUrl()
{
return $this->getUrl() . '/edit';
}
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public function pages()
{
return $this->hasMany('Oxbow\Page');
}
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public function chapters()
{
return $this->hasMany('Oxbow\Chapter');
}
public function children()
{
$pages = $this->pages()->where('chapter_id', '=', 0)->get();
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$chapters = $this->chapters()->get();
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foreach($chapters as $chapter) {
$pages->push($chapter);
}
return $pages->sortBy('priority');
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}
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}