Laravel Auth/Guard未使用有效凭证登录

这是我之前关于表单请求的问题的后续，现在已经解决了。不幸的是，应用程序无法使用正确的凭据登录。我以前遇到过这个问题，解决方案与会话有关-然而，这里的情况不是这样，因为会话被正确设置，以及一个密钥。

当提供正确的凭据时，$auth->attempt()返回false。

模式:

Schema::create('users', function (Blueprint $t) {
    $t->increments('id')->unsigned();
    $t->timestamps();
    $t->rememberToken();
    $t->boolean('system')->default(false);
    $t->boolean('activated')->default(true);
    $t->string('username')->unique();
    $t->string('email')->unique()->nullable();
    $t->string('passphrase', 64);
    $t->string('first_name', 20)->nullable();
    $t->string('last_name', 20)->nullable();
    $t->text('meta')->nullable();
});

$adminUser = App'User::create([
    'system' => true,
    'username' => 'SysAdmin',
    'passphrase' => bcrypt('the-password'),
]);
$adminUser->attachRole($administratorRole);

namespace App;
use Bican'Roles'Contracts'HasRoleAndPermission as HasRoleAndPermissionContract;
use Bican'Roles'Traits'HasRoleAndPermission;
use Illuminate'Auth'Authenticatable;
use Illuminate'Auth'Passwords'CanResetPassword;
use Illuminate'Contracts'Auth'Authenticatable as AuthenticatableContract;
use Illuminate'Contracts'Auth'CanResetPassword as CanResetPasswordContract;
use Illuminate'Database'Eloquent'Model;
class User extends Model implements AuthenticatableContract, CanResetPasswordContract, HasRoleAndPermissionContract
{
    use Authenticatable, CanResetPassword, HasRoleAndPermission;
    protected $table = 'users';
    protected $fillable = ['system', 'username', 'email', 'passphrase', 'first_name', 'last_name'];
    protected $hidden = ['passphrase', 'remember_token'];
}

AuthController: attemptSignIn()方法:

用户可以使用用户名或电子邮件地址登录。

public function attemptSignIn(SignInRequest $request = null, $type = 'regular')
{
    switch ($type) {
        case 'regular':
            $identifierFieldName = 'account_identifier';
            $field = filter_var($this->request->input($identifierFieldName), FILTER_VALIDATE_EMAIL) ? 'email' : 'username';
            $this->request->merge([$field => $this->request->input($identifierFieldName)]);
            $specifics = $this->request->only($field, 'passphrase');
            if ($this->auth->attempt($specifics)) {
                return redirect($this->redirectPath);
            } else {
                return redirect($this->signInPath)
                    ->with('authError', "The credentials you've provided are incorrect.")
                    ->with('authErrorType', 'danger')
                    ->withInput($this->request->only($identifierFieldName));
            }
            break;
        case 'oota':
            break;
    }
}

$specifics中设置的信息正确，且与数据库中的记录匹配。

也许我错过了一些简单的?