BookStack/app/Entities/BookChild.php

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<?php namespace BookStack\Entities;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
/**
* Class BookChild
* @property int $book_id
* @property int $priority
* @property Book $book
* @method Builder whereSlugs(string $bookSlug, string $childSlug)
*/
class BookChild extends Entity
{
/**
* Scope a query to find items where the the child has the given childSlug
* where its parent has the bookSlug.
*/
public function scopeWhereSlugs(Builder $query, string $bookSlug, string $childSlug)
{
return $query->with('book')
->whereHas('book', function (Builder $query) use ($bookSlug) {
$query->where('slug', '=', $bookSlug);
})
->where('slug', '=', $childSlug);
}
/**
* Get the book this page sits in.
* @return BelongsTo
*/
public function book(): BelongsTo
{
return $this->belongsTo(Book::class);
}
/**
* Change the book that this entity belongs to.
*/
public function changeBook(int $newBookId): Entity
{
$this->book_id = $newBookId;
$this->refreshSlug();
$this->save();
$this->refresh();
// Update related activity
$this->activity()->update(['book_id' => $newBookId]);
// Update all child pages if a chapter
if ($this instanceof Chapter) {
foreach ($this->pages as $page) {
$page->changeBook($newBookId);
}
}
return $this;
}
}