Laravel data Model layer m error massassignmentexception in model.php line 407:username

Through the data model layer m

Public Function UserAdd ()
{
Inserting data through an array
$user _data=[' username ' = ' asd ', ' age ' =>34];

$this:: Fill ($user _data);

$this:: Save ();

}

Browser report error: Massassignmentexception in model.php line 407:username

After a day of research, a possible problem was found

1, this may be a field error

2, code Error

3, there is whether to open the Laravel whitelist field, open can be manipulated to write

protected $fillable = [' username ', ' age '];//open whitelist field

The problem is resolved at this time. Ha ha

Laravel data Model layer m error massassignmentexception in model.php line 407:username