Insert function at controller with model doesn't work in codeigniter4.. How can I solve this? - codeigniter-4

Question

I've been facing the problem since two days ago. But, can't fix it either. I have submitted all the necessary coding information below. Please, help me out.
Here is my controller...
<?php namespace App\Controllers;
use App\Models\UserModel;
use App\Controllers\BaseController;
class UserController extends BaseController
{
protected $userModel;
public function __construct()
{
$this->userModel = new UserModel();
}
public function registration() {
if($this->request->getMethod() == 'post'):
$rules = $this->userModel->getValidationRules(['only' => ['user', 'email', 'password',
'confirm_password', 'gender']]);
if(!$this->validate($rules)):
$this->session->setFlashdata('errors', $this->validator->getErrors());
return redirect()->back()->withInput();
else:
$data = $this->request->getPost();
unset($data['confirm_password'], $data['registration'], $data['ci4app_auto_fill']);
if($this->userModel->insert($data)):
$this->session->setFlashdata('success', 'Your registration has been done successfully. Thank you.');
return redirect()->to('login');
else:
echo "Sorry! Your registration has not been successful. Please, try again. Thank you.";
endif;
endif;
endif;
}
}
and here is my model
<?php namespace App\Models;
use CodeIgniter\Model;
class UserModel extends Model
{
protected $table = 'users';
protected $primaryKey = 'id';
protected $returnType = 'array';
protected $allowedFields = ['user', 'name', 'email', 'phone', 'gender', 'password', 'address',
'city', 'estate', 'country', 'image'];
protected $beforeInsert = ['hashPassword'];
protected $useSoftDeletes = true;
protected $useTimestamps = false;
protected $createdField = 'created_at';
protected $updatedField = 'updated_at';
protected $deletedField = 'deleted_at';
protected $validationRules = [
'user' => [
'label' => 'User ID',
'rules' => 'trim|required|is_unique[users.user,id,{id}]|alpha_numeric|min_length[3]'
],
'gender' => [
'label' => 'Gender',
'rules' => 'trim|required'
],
'email' => [
'label' => 'E-mail ID',
'rules' => 'trim|required|is_unique[users.email,id,{id}]|valid_email'
],
'password' => [
'label' => 'Password',
'rules' => 'trim|required|min_length[5]'
],
'confirm_password' => [
'label' => "Password Confirmation",
'rules' => 'trim|required|matches[password]'
],
'phone' => [
'label' => 'Phone Number',
'rules' => 'trim|numeric|max_length[13]|is_unique[users.phone,id,{id}]'
],
'address' => [
'label' => 'Address',
'rules' => 'trim|alpha_numeric_space'
],
'city' => [
'label' => 'City',
'rules' => 'trim|alpha_numeric_space'
],
'estate' => [
'label' => 'Estate',
'rules' => 'trim|alpha_space'
],
'country' => [
'label' => 'Country',
'rules' => 'trim|alpha_space'
]
];
protected $validationMessages = [];
protected $skipValidation = false;
public function hashPassword($data) {
if(! isset($data['data']['password'])) return $data;
$data['data']['password'] = password_hash($data['data']['password'], PASSWORD_DEFAULT);
return $data;
}
}
Neither data is being inserted nor any error has occurred!
What is the problem for I couldn't insert data into my database?
Now please tell me, how I can solve this problem. Thank you...