Laravel Sql query groupBy and Order - mysql

Question

I need some help to make a query.
Database tabless
Example:
The user inserts a actor name(name and surname) and i need to loop over all the movies and then retrieve which category has more occurrences.
I need some help to make the query(this one is only a sketch):
$src=array("Leonardo","DiCaprio");
$film2=film::with('category')->with('actor')->wherehas('actor', function($q) use($src){
$q->where('first_name', $src[0])->where('last_name', $src[1]);
})->wherehas('category', function($qr){
$qr->groupBy('name')->orderBy('name', 'DESC');
})->FIRST();
model Film:
class film extends Model{
protected $table = "film";
protected $primaryKey = 'film_id';
public $timestamps = false;
use HasFactory;
protected $sql=['film_id', 'title', 'length'];
public function category(){
return $this->belongsToMany(category::class,'film_category', 'film_id', 'category_id');
}
public function actor(){
return $this->belongsToMany(actor::class,'film_actor', 'film_id', 'actor_id');
}
}
model Actor:
class actor extends Model{
protected $primaryKey = 'actor_id';
public $timestamps = false;
use HasFactory;
protected $sql=['actor_id', 'first_name', 'last_name'];
}
model Category:
class category extends Model{
protected $table = "category";
protected $primaryKey = 'category_id';
public $timestamps = false;
use HasFactory;
protected $sql=['category_id','name'];
public function film(){
return $this->belongsToMany(film::class,'film_category', 'category_id', 'film_id');
}
}

Answer 1

Here is the solution:
In Actor.php add Join
public function filmActor(){
return $this->hasMany(FilmActor::class, 'actor_id','actor_id');
}
Find the actor with filmActor join table
$src=array("Leonardo","DiCaprio");
$actor=Actor::whereHas('filmActor')->where(['first_name' => $src[0],'last_name'=> $src[1]])->first();
Put film_id in the array
foreach($actor->filmActor as $film){
$filmIds[]=$film->film_id;
}
Get FilmCategory who have filmIds
$filmCategory=FilmCategory::whereIn('film_id',$filmIds)->get();
Put category_id in the array
foreach($filmCategory as $category){
$categoryIds[]=$category->category_id;
}
Count how much is duplicate category_id
$count =array_count_values($categoryIds);
Get the higher counted $max = max($count);
Get the key of max which is category_id $key = array_search($max, $count);
Here is the category who has more occurrences.
$category=Category::where('category_id',$key)->first();