Yii2

Question

我卡在了一些非常基本的事情上，无法继续前进。我有这样的表 interpret 和 interpret_member（这里只是重要数据）：

$this->createTable('interpret', [
    'name'      => $this->string(255)->notNull(),
    'PRIMARY KEY (name)'
]);

$this->createTable('interpret_member', [
    'name'      => $this->string(255)->notNull(),
    'interpret' => $this->string(255)->notNull(),
    'PRIMARY KEY (name, interpret)'
]);

$this->createIndex(
    'idx-interpret_member',
    'interpret_member',
    'interpret'
);

$this->addForeignKey('fk-interpret_member', 'interpret_member', 'interpret', 'interpret', 'name', 'CASCADE', 'CASCADE');

然后我有gii生成的两个表的模型，所以我在Interpret model中也有方法getInterpretMembers。首先，我尝试根据 this manual, which gives me an error Trying to get property 'name' of non-object. So I searched here and found thread. Following that I changed my foreach ($members as $member) to foreach ($members->InterpretMember as $member). That gave me error Getting unknown property: yii\db\ActiveQuery::InterpretMember. The last hope was 线程解析其输出，但因错误 Trying to get property 'name' of non-object 而结束。上次尝试的代码是：

public function getInterpretMembers()
{
    $members = $this->hasMany(InterpretMember::className(), ['interpret' => 'name']);
    foreach ($members as $member) {
        $member = ArrayHelper::toArray($member, [
            'app\models\user\InterpretMember' => [
                'name',
                'interpret',
                'position'
            ]
        ]);
        echo "Member = {$member->name}<br/>";
    }
    die();
}

我在所有尝试中都使用了这段代码，它只是根据提到的线程和手册进行了修改。

Answer 1

问题很简单

$members = $this->hasMany(InterpretMember::className(), ['interpret' => 'name']);

hasMany函数returns一个ActiveQuery实例而实际上不是来自数据库的数据，所以为了得到你需要的数据从 ActiveQuery 实例

调用 one() 或 all() 函数

$members = $this->hasMany(InterpretMember::className(), ['interpret' => 'name'])->all();

恭喜，现在你将拥有数据

Answer 2

您误解了关系和 ActiveRecord 在 Yii2 中的工作方式。

您的模型应该是什么样子。

解释模型

class Interpret extends \yii\db\ActiveRecord
{
    /**
    * Method that defines the relation. It should
    * return instance of \yii\db\ActiveQuery
    */
    public function getInterpretMembers()
    {
        return $this->hasMany(InterpretMember::class, ['interpret' => 'name']);
    }

    //... other methods
}

解释成员模型

class InterpretMember extends \yii\db\ActiveRecord
{
    public function getInterpret()
    {
        return $this->hasOne(Interpret::class, ['name' => 'interpret'])
    }
}

这将在您的 Interpret class 中创建属性 interpretMembers 并在您的 InterpretMember [=] 中创建属性 interpret 33=].

要在您的控制器中使用它，您可以执行以下操作：

class InterpretController extends \yii\web\Controller
{
    public function actionView()
    {
        //find interpret with name InterpretName
        $interpret = Interpret::findOne('InterpretName');
        //output all members
        foreach ($interpret->interpretMembers as $member) {
            echo "Member = {$member->name}<br/>";
        }
        die();
    }
}

或者，如果您想在 Interpret class 中使用成员：

class Interpret extends \yii\db\ActiveRecord
{
    /**
    * Method that defines the relation. It should
    * return instance of \yii\db\ActiveQuery
    */
    public function getInterpretMembers()
    {
        return $this->hasMany(InterpretMember::class, ['interpret' => 'name']);
    }

    //... other methods

    public function doSomethingWithMembers()
    {
        foreach ($this->interpretMembers as $member) {
            echo "Member = {$member->name}<br/>";
        }
        die();
    }
}

Yii2 - 无法解析 hasMany() 的结果

Yii2 - Unable to parse result of hasMany()

php

yii2-basic-app

yii2-model