how to group by item many to many query builder laravel - laravel

Question

I have comics and categories related many to many through pivot tables. I use join and groupBy caterories.id but it doesn't group categories same comics id.
If I do not use the group
$result = DB::table('comics')
->select('comics.name','categories.title')
->join('category_comic', 'comics.id', '=', 'category_comic.comic_id')
->join('categories', 'category_comic.category_id', '=', 'categories.id')
->get();
I want each comic group category
(source: uphinh.org)

Answer 1

First of all
try tou use Laravel Eloquent Relationship and its really cool and very easy to use
In Eloquent Method
In Comics Model
add relationship function
public function cat(){
return $this->hasOne(ComicCategory::class,'id','comic_id'); //ComicCategory::class is your category_comic model
}
Then you just need you Comic Model to get a group of your category com
$result = Comic::with('cat')->get(); //Commic is your model
In query Builder, you need to group manual using foreach
$result = DB::table('comics')
->select('comics.name','categories.title')
->join('category_comic', 'comics.id', '=', 'category_comic.comic_id')
->join('categories', 'category_comic.category_id', '=', 'categories.id')
->get();
$result = json_decode(json_encode($result), TRUE);
$new_result = [];
foreach($result as $row){
$arr[$row['id']]['name'] = $row['name'];
$arr[$row['id']]['cat'][] = $row['title'];
}
and finally rearange the key
$new_result = array_values($new_result );
PS : thats array method, i never group using object method