can'；t更新CakePHP中的现有记录

我编写了一个编辑函数来更新用户信息，我的代码：

if($this->request->is('post')){
                $this->request->data['User']['password']=Security::hash($this->request->data['User']['password'],'sha1', Configure::read('Security.salt'));
                $this->request->data['User']['type'] = '2';
                $this->request->data['User']['username'] = $username;
                //debug($this->request->data);
                if($this->User->validates()){
                    $this->User->set($this->request->data['User']);
                    if ($this->User->save($this->request->data,false)) {
                        $this->Session->setFlash(__('The user has been saved'));
                        $this->redirect($this->root.'index');
                    } else {
                        $this->Session->setFlash(__('The user could not be saved. Please, try again.'));
                    }
                }
            }

---

但是我检查了这个函数：$this->User->exists（）从不返回true，在我的情况下，用户表键是username，当我编辑username时，这个函数可以将新信息保存为新记录，但是当我没有编辑username时，a无法保存新信息，为什么它会这样工作，我如何更正我的函数以编辑记录？

相信我，您几乎总是希望在表中有一个

id

。添加它并使其成为主键

现在看起来是这样的：

if($this->request->is('post')){

    // Think about using AuthComponent:
    // $this->request->data['User']['password'] = AuthComponent::password($this->request->data['User']['password']);
    $this->request->data['User']['password'] = Security::hash($this->request->data['User']['password'],'sha1', Configure::read('Security.salt'));
    $this->request->data['User']['type'] = '2';
    $this->request->data['User']['username'] = $username;
    $this->User->id = $id;

    // Checking if the user exists.
    if(!$this->User->exists()){
        // If not, tell it here.
    }

    if($this->User->validates()){
        if ($this->User->save($this->request->data, false)) {
            $this->Session->setFlash(__('The user has been saved'));
            $this->redirect($this->root.'index');
        } else {
            $this->Session->setFlash(__('The user could not be saved. Please, try again.'));
        }
    }else{
        // Something went wrong.
    }
}

如果您的主键有username，每次不同时，CakePHP都会创建一个新记录

现在，我将通过AJAX调用为您提供函数

read

，也许它会对您有所帮助

// Function for creating and updating users.
    public function update(){

        // If the request is AJAX (from Ext-JS).
        if($this->request->is('ajax')){

            // Prepare data for CakePHP. $this->request->data['ModelName'] => array of data.
            $this->request->data['User'] = $this->request->data;

            // If there is "id" in data, then it's "edit".
            // If there is no "id" in data, then it's "add".
            if($this->request->data['id'] != null){

                // Setting "id" for user so the CakePHP could use "save", "saveAll", "exits" or 
                // any other function for a particular user.
                $this->User->id = $this->request->data['id'];

                // Checking if the user exists.
                if (!$this->User->exists()) {

                    // If there is no user with a given "id", remove the data (security reasons).
                    // Put the "success" and "message" (message) properties.
                    $this->request->data = array();
                    $this->request->data['success'] = false;
                    $this->request->data['message'] = "No user with this id.";

                    // Return the message to Ext-JS.
                    return new CakeResponse(array('body' => json_encode($this->request->data)));
                }

                // List of fields to save.
                $fieldList = array('id', 'first_name', 'last_name', 'username', 'role_id', 'language_id', 'status', 'last_login', 'created', 'modified');

                // Only if there is an password provided by user, save it.
                if($this->request->data['User']['password'] != ''){
                    array_push($fieldList, 'password');
                }

                // If you are here, then there is a user with a given "id" and you are editing that user.
                if ($this->User->save($this->request->data, true, $fieldList)) {

                    // Remove any data except the "success" and "message" (message) properties (security reasons).
                    $this->request->data = array();
                    $this->request->data['success'] = true;
                    $this->request->data['message'] = "The user has been changed.";
                }else {

                    // If you are here, something went wrong with editing a user. Remove the data (security reasons).
                    // Put the "success" and "message" (message) properties.
                    $this->request->data = array();
                    $this->request->data['success'] = false;
                    $this->request->data['message'] = "Error with editing.";
                }
            }else{

                // If you are here, then you are adding a new user (because there is no "id" in data). Create a new row in table.
                $this->User->create();

                // Try to save the user with data from $this->request->data['User'].
                if ($this->User->save($this->request->data)) {

                    // If you are here, then everything is ok. Remove any data and tell that to Ext-JS with "success" and "message" (message) properties.
                    $this->request->data = array();
                    $this->request->data['success'] = true;
                    $this->request->data['message'] = "The user has been added.";
                }else{

                    // If you are here, something probably went wrong with $this->request->data['User'].
                    // Remove any data (security reasons) and tell that to Ext-JS with "success" and "message" (message) properties.
                    $this->request->data = array();
                    $this->request->data['success'] = false;
                    $this->request->data['message'] = "Something went wrong with adding a user.";
                }
            }

            // Return any data to Ext-JS, despite the success.
            // $this->request->data['success'] => (true | false).
            // $this->request->data['message'] => (message for Ext-JS).
            return new CakeResponse(array('body' => json_encode($this->request->data)));
        }
    }

现在，您将

会话

消息发送给用户，而不是

返回新的CakeResponse

。

调试代码 在此之前，在问题代码中，没有任何一点进行过以下操作：

• 调用

  create

• 在模型上调用

  set

因此，这里发生的是代码尝试验证空模型对象。假设返回false（如问题所暗示的），保存“不起作用”的原因是代码根本没有调用

save

但是我检查了这个函数：$this->User->exists（）从不返回true

由于不需要调用

create

，

set

或设置

User->id

属性，因此应该这样做

请参阅文档 可以显式调用

验证

，但也没有必要

Save

已经调用了验证——同样地，如果您的代码有效，您将运行两次验证规则

请参考以下中的示例：

public function edit($id) {
    if ($this->request->is('post')) {
        if ($this->Recipe->save($this->request->data)) {
            $this->Session->setFlash('Recipe Saved!');
            $this->redirect('/recipes');
        }
    }

    $this->set('recipe', $this->Recipe->findById($id));
}

尝试以下步骤

如果（$this->User->save（$this->request->data，false））{

---

}

那么表的主键是用户名，您想更新该键吗？为什么不添加一个

id

字段来简化您的生活。我想更新此记录的所有字段，但此代码只能创建新记录

$user\u info

中有数据吗？将

debug（$user\u info）

放在

if（$this->request->is（'post'））{

部分上方。在更改表格后，您是否编辑了

模型

？

public function edit($id) {
    if ($this->request->is('post')) {
        if ($this->Recipe->save($this->request->data)) {
            $this->Session->setFlash('Recipe Saved!');
            $this->redirect('/recipes');
        }
    }

    $this->set('recipe', $this->Recipe->findById($id));
}

        $this->Session->setFlash(__('Recipe Saved!'));

        return $this->redirect(array('action' => 'view_users'));