Php 获取错误文件在yii2中不能为空

虽然上传了yii2中的文件，但仍然得到验证，配置文件Pic不能为空。我的代码如下。请帮我解决这个问题

public function rules() {
    return [
        [['profile_pic'], 'file'],
        [ ['profile_pic'], 'required', 'on' => 'update_pic']];
}

来自控制器

$model = new PostForm(['scenario' => 'update_pic']);
if ($model->load(Yii::$app->getRequest()->getBodyParams(), '') && $model->validate()) {
    return ['status' => 1, 'message' => Yii::$app->params['messages']['post_success']];
} else {
    $model->validate();
    return $model;
}

---

正如@Bizley和@sm1979所评论的，您并没有按照需要处理文件上传

实际文件的接收方式与其他post参数不同，因此需要使用

UploadedFile:：getInstance

获取文件实例并将其分配给模型中的

profile\u pic

属性

在控制器中：

$model = new PostForm(['scenario' => 'update_pic']);
// We load the post params from the current request
if($model->load(Yii::$app->request->post())) {
    // We assign the file instance to profile_pic in your model.
    // We need to do this because the uploaded file is not a part of the
    // post params.
    $model->profile_pic = UploadedFile::getInstance($model, 'profile_pic')
    // We call a new upload method from your model. This method calls the
    // model's validate method and saves the uploaded file.
    // This is important because otherwise the uploaded file will be lost
    // as it is a temporary file and will be deleted later on.
    if($model->upload()) {
        return ['status' => 1, 'message' => Yii::$app->params['messages']['post_success']];
    }
}
return $model;

在您的模型中：

public function upload() {
    // We validate the model before doing anything else
    if($this->validate()) {
        // The model was validated so we can now save the uploaded file.
        // Note how we can get the baseName and extension from the 
        // uploaded file, so we can keep the same name and extension.
        $this->profile_pic->saveAs('uploads/' . $this->profile_pic->baseName . '.' . $this->profile_pic->extension);
        return true;
    }
    return false;
}

---

最后，只是一个建议：阅读。阅读本文和是自己学习Yii2的最佳方式。

你能发布其余的代码吗？调用此ruleRead添加了代码，因为你没有正确处理上传的文件。我不希望按照上述代码在模型中返回响应。请按照@Bizley的建议正确阅读该文档。使用

$model->load（Yii:：$app->getRequest（）->getBodyParams（），“”）

不会将上载的文件分配给模型。需要使用控制器中的

UploadedFile:：getInstance（）

单独处理文件输入。所以我再次重申，请浏览@Bizley posted的链接，特别是标题为