Laravel update or delete in sql multiselect field - sql

Question

I have multiselect option in my website.
<select multiple name="genres[]">
<option value="1">action</option>
<option value="2">adult</option>
<option value="3">advanture</option>
<option value="4">anime</option>
<option value="5">biographic</option>
</select>
Also i have fields in db
shows
id name
1 grey's anatomy
2 the morning show
genres
id name
1 action
2 adult
3 advanture
3 anime
5 biographic
data_show_genres
id show_id genre_id
1 1 4
2 1 2
3 2 1
After Submit button, function do
foreach ($input['genres'] as $genre) {
DataShowGenres::updateOrCreate(
['show_id' => $id, 'genre_id' => $genre]
);
}
So adding work's, but when i try to remove, i mean unselect some data. Old still stays. I can always delete old data for that show but is there any way to do this better?
Edit:
Controller:
public function edit_update(Request $request, $id)
{
$request->validate([
'title' => 'required|min:1|max:300',
'imdb' => 'required|min:0|max:10000000|numeric',
'tvdb' => 'required|min:0|max:10000000|numeric',
'youtube' => 'nullable|url',
'hidden' => 'nullable',
]);
$input = $request->all();
$input['hidden'] = $request->has('hidden') ? 1 : 0;
$input['recommend'] = $request->has('recommend') ? 1 : 0;
if (empty($input["genres"])) {
} else {
foreach ($input['genres'] as $genre) {
$zanr = DataShowGenres::updateOrCreate(
['show_id' => $id, 'genre_id' => $genre]
);
}
}
$serija = Serija::FindOrFail($id_serije);
$serija->title = $input['title'];
$serija->imdb = $input['imdb'];
$serija->tvdb = $input['tvdb'];
$serija->imdb_rating = $input['imdb_rating'];
$serija->tmdb = $input['tmdb'];
$serija->hidden = $input['hidden'];
$serija->youtube = $input['youtube'];
$serija->save();
toast('Edited!', 'success');
return back();
}
Route:
Route::get('/serije/izmeni/{id}/{slug}', 'SerijeController#edit')->where(['id' => '[0-9]+', 'title' => '^[a-z0-9]+(?:-[a-z0-9]+)*$'])->middleware('permission:show_edit');
Route::post('/serije/izmeni/{id}/{slug}', 'SerijeController#edit_update')->where(['id' => '[0-9]+', 'naziv' => '^[a-z0-9]+(?:-[a-z0-9]+)*$'])->middleware('permission:show_edit');

Answer 1

Syncing Associations
You may use the sync method to construct many-to-many
associations. The sync method accepts an array of IDs to place on the
intermediate table. Any IDs that are not in the given array will be
removed from the intermediate table. So, after this operation is
complete, only the IDs in the given array will exist in the
intermediate table:
//...
$show = Show::findOrFail($id);
$show->genres()->sync($input['genres']);
//...