Yii2 - 無法在file：backend/models/User.php中找到'app \ models \ User'。命名空間丟失？

Question

我在這個文件中使用了兩個命名空間後端/ models/User.php

當我使用命名空間app \ models;它顯示無法找到'backend \ models \ User'。

如果我使用命名空間後端\ models;它顯示無法找到「應用程序\型號\用戶」

<?php 
//namespace app\models; 
namespace backend\models; 

use Yii; 
use yii\base\NotSupportedException; 
use yii\behaviors\TimestampBehavior; 
use yii\db\ActiveRecord; 
use yii\web\IdentityInterface; 


class User extends ActiveRecord implements IdentityInterface 
{ 
    const STATUS_DELETED = 0; 
    const STATUS_ACTIVE = 10; 
    const ROLE_USER = 10; 

    /** 
    * @inheritdoc 
    */ 
    public static function tableName() 
    { 
     return 'admin'; 
    } 

    /** 
    * @inheritdoc 
    */ 
    public function behaviors() 
    { 
     return [ 
      TimestampBehavior::className(), 
     ]; 
    } 

    /** 
    * @inheritdoc 
    */ 
    public function rules() 
    { 
     return [ 
      ['status', 'default', 'value' => self::STATUS_ACTIVE], 
      ['status', 'in', 'range' => [self::STATUS_ACTIVE, self::STATUS_DELETED]], 

      ['role', 'default', 'value' => self::ROLE_USER], 
      ['role', 'in', 'range' => [self::ROLE_USER]], 
     ]; 
    } 

    /** 
    * @inheritdoc 
    */ 
    public static function findIdentity($id) 
    { 
     return static::findOne(['id' => $id, 'status' => self::STATUS_ACTIVE]); 
    } 

    /** 
    * @inheritdoc 
    */ 
    public static function findIdentityByAccessToken($token, $type = null) 
    { 
     throw new NotSupportedException('"findIdentityByAccessToken" is not implemented.'); 
    } 

    /** 
    * Finds user by username 
    * 
    * @param string $username 
    * @return static|null 
    */ 
    public static function findByUsername($username) 
    { 
     return static::findOne(['username' => $username, 'status' => self::STATUS_ACTIVE]); 
    } 

    /** 
    * Finds user by password reset token 
    * 
    * @param string $token password reset token 
    * @return static|null 
    */ 
    public static function findByPasswordResetToken($token) 
    { 
     if (!static::isPasswordResetTokenValid($token)) { 
      return null; 
     } 

     return static::findOne([ 
      'password_reset_token' => $token, 
      'status' => self::STATUS_ACTIVE, 
     ]); 
    } 

    /** 
    * Finds out if password reset token is valid 
    * 
    * @param string $token password reset token 
    * @return boolean 
    */ 
    public static function isPasswordResetTokenValid($token) 
    { 
     if (empty($token)) { 
      return false; 
     } 
     $expire = Yii::$app->params['user.passwordResetTokenExpire']; 
     $parts = explode('_', $token); 
     $timestamp = (int) end($parts); 
     return $timestamp + $expire >= time(); 
    } 

    /** 
    * @inheritdoc 
    */ 
    public function getId() 
    { 
     return $this->getPrimaryKey(); 
    } 

    /** 
    * @inheritdoc 
    */ 
    public function getAuthKey() 
    { 
     return $this->auth_key; 
    } 

    /** 
    * @inheritdoc 
    */ 
    public function validateAuthKey($authKey) 
    { 
     return $this->getAuthKey() === $authKey; 
    } 

    /** 
    * Validates password 
    * 
    * @param string $password password to validate 
    * @return boolean if password provided is valid for current user 
    */ 
    public function validatePassword($password) 
    { 
     return Yii::$app->security->validatePassword($password, $this->password_hash); 
    } 

    /** 
    * Generates password hash from password and sets it to the model 
    * 
    * @param string $password 
    */ 
    public function setPassword($password) 
    { 
     $this->password_hash = Yii::$app->security->generatePasswordHash($password); 
    } 

    /** 
    * Generates "remember me" authentication key 
    */ 
    public function generateAuthKey() 
    { 
     $this->auth_key = Yii::$app->security->generateRandomString(); 
    } 

    /** 
    * Generates new password reset token 
    */ 
    public function generatePasswordResetToken() 
    { 
     $this->password_reset_token = Yii::$app->security->generateRandomString() . '_' . time(); 
    } 

    /** 
    * Removes password reset token 
    */ 
    public function removePasswordResetToken() 
    { 
     $this->password_reset_token = null; 
    } 
} 

Answer 1

我覺得你的問題是，你有兩個不同的模式，並嘗試在一個命名空間中使用他們兩個，但是這是不行的。 您可以別名一個名稱空間，因此您可以使用兩種不同的模型。 例如：

<?php 
namespace app\models; 
// there exist a model "User" 
// and you wanna use also the User model under common\models\ 
use common\models\User as CUser; 

另一種解決方案是加前綴命名空間的模型像

<?php 
namespace app\models; 
$cuser = new \common\models\User(); 

看到PHP Namespaces explained