Laravel: why can't I access the model?

Question

HTML

The page has a form.
To record the entered data in the database, I need to find a specific row from the table:
This happens as follows:

$alerts_info = $request->get('alert_info');
        foreach ($alerts_info as $id => $value) {
            $alert = AlertsModel::find($id + 1);
            dd($alert);
            $alert->alert_info = $value;
            $alert->save();
        }

This code works. Through dd() I check what was written to the $alert variable.
I get this:

And everything is fine here, but there is absolutely identical code that for some reason does not want to work:

$visibility_vals = $request->get('block_visibility');
        foreach ($visibility_vals as $id => $value) {
            $visibility = VisibilityModel::find($id + 1);
            if (is_null($value)) {
                $value = 0;
            };
            //dd($visibility);
            //$visibility->visible = $value;
            //$visibility->save();
        }

Here $visibility is set to null. And even if you write find (1), for example, it will still be null.
Moreover, if you do this:

$visibility_vals = $request->get('block_visibility');
        foreach ($visibility_vals as $id => $value) {
            $visibility = VisibilityModel::All();
            if (is_null($value)) {
                $value = 0;
            };
            dd($visibility);
            $visibility->visible = $value;
            $visibility->save();
        }

That all works well.

And then I can access any line through $visibility[0];
What am I doing wrong? How is it that I can access the entire table but not a particular row?

Answer 1

The fact that Model::all() returns data only means that there is data in the database.
If find returns null, it means that it did not find an entry with that ID.
Are there records in the database with the ID that you are trying to get?