我有2张桌子，postimage和post。 Postimage包含字段post_id，id和image。我需要创建图像的上传表单并在创建内容时显示它。此图像应该与内容相关联（尽管是post_id字段）。出现上传表单但图片无法上传。我尝试过这样的方式：
class PostImageController extends Controller
{
public $layout='//layouts/column2';
/**
* @return array action filters
*/
public function filters()
{
return array(
'accessControl', // perform access control for CRUD operations
'postOnly + delete', // we only allow deletion via POST request
);
}
/**
* Specifies the access control rules.
* This method is used by the 'accessControl' filter.
* @return array access control rules
*/
public function accessRules()
{
return array(
array('allow', // allow all users to perform 'index' and 'view' actions
'actions'=>array('index','view'),
'users'=>array('*'),
),
array('allow', // allow authenticated user to perform 'create' and 'update' actions
'actions'=>array('create','update'),
'users'=>array('@'),
),
array('allow', // allow admin user to perform 'admin' and 'delete' actions
'actions'=>array('admin','delete'),
'users'=>array('admin'),
),
array('deny', // deny all users
'users'=>array('*'),
),
);
}
/**
* Displays a particular model.
* @param integer $id the ID of the model to be displayed
*/
public function actionView($id)
{
$this->render('view',array(
'model'=>$this->loadModel($id),
));
}
/**
* Creates a new model.
* If creation is successful, the browser will be redirected to the 'view' page.
*/
public function actionCreate()
{
$model=new PostImage;
// Uncomment the following line if AJAX validation is needed
// $this->performAjaxValidation($model);
if(isset($_POST['PostImage']))
{
$model->attributes=$_POST['PostImage'];
$model->image=CUploadedFile::getInstance($model,'image');
if($model->save())
$path=Yii::getPathOfAlias('webroot').'/images/'.$model->image->getName();
$model->image->saveAs($path);
//$this->redirect(array('view','id'=>$model->id));
}
$this->render('create',array(
'model'=>$model,
));
}
/**
* Updates a particular model.
* If update is successful, the browser will be redirected to the 'view' page.
* @param integer $id the ID of the model to be updated
*/
public function actionUpdate($id)
{
$model=$this->loadModel($id);
// Uncomment the following line if AJAX validation is needed
// $this->performAjaxValidation($model);
if(isset($_POST['PostImage']))
{
$model->attributes=$_POST['PostImage'];
if($model->save())
$this->redirect(array('view','id'=>$model->id));
}
$this->render('update',array(
'model'=>$model,
));
}
/**
* Deletes a particular model.
* If deletion is successful, the browser will be redirected to the 'admin' page.
* @param integer $id the ID of the model to be deleted
*/
public function actionDelete($id)
{
$this->loadModel($id)->delete();
// if AJAX request (triggered by deletion via admin grid view), we should not redirect the browser
if(!isset($_GET['ajax']))
$this->redirect(isset($_POST['returnUrl']) ? $_POST['returnUrl'] : array('admin'));
}
/**
* Lists all models.
*/
public function actionIndex()
{
$dataProvider=new CActiveDataProvider('PostImage');
$this->render('index',array(
'dataProvider'=>$dataProvider,
));
}
/**
* Manages all models.
*/
public function actionAdmin()
{
$model=new PostImage('search');
$model->unsetAttributes(); // clear any default values
if(isset($_GET['PostImage']))
$model->attributes=$_GET['PostImage'];
$this->render('admin',array(
'model'=>$model,
));
}
/**
* Returns the data model based on the primary key given in the GET variable.
* If the data model is not found, an HTTP exception will be raised.
* @param integer $id the ID of the model to be loaded
* @return PostImage the loaded model
* @throws CHttpException
*/
public function loadModel($id)
{
$model=PostImage::model()->findByPk($id);
if($model===null)
throw new CHttpException(404,'The requested page does not exist.');
return $model;
}
/**
* Performs the AJAX validation.
* @param PostImage $model the model to be validated
*/
protected function performAjaxValidation($model)
{
if(isset($_POST['ajax']) && $_POST['ajax']==='post-image-form')
{
echo CActiveForm::validate($model);
Yii::app()->end();
}
}
}
PostImage模型：
<?php
/**
* This is the model class for table "PostImage".
*
* The followings are the available columns in table 'PostImage':
* @property integer $id
* @property string $image
* @property integer $post_id
*
* The followings are the available model relations:
* @property Post $post
*/
class PostImage extends CActiveRecord
{
/**
* @return string the associated database table name
*/
public $image;
public function tableName()
{
return 'PostImage';
}
/**
* @return array validation rules for model attributes.
*/
public function rules()
{
// NOTE: you should only define rules for those attributes that
// will receive user inputs.
return array(
//array('image', 'required'),
array('post_id', 'numerical', 'integerOnly'=>true),
array('image', 'length', 'max'=>255),
// The following rule is used by search().
// @todo Please remove those attributes that should not be searched.
array('id, image, post_id', 'safe', 'on'=>'search'),
array('image', 'file', 'types'=>'jpg, gif, png'),
);
}
/**
* @return array relational rules.
*/
public function relations()
{
// NOTE: you may need to adjust the relation name and the related
// class name for the relations automatically generated below.
return array(
'post' => array(self::BELONGS_TO, 'Post', 'post_id'),
);
}
/**
* @return array customized attribute labels (name=>label)
*/
public function attributeLabels()
{
return array(
'id' => 'ID',
'image' => 'Image',
'post_id' => 'Post',
);
}
/**
* Retrieves a list of models based on the current search/filter conditions.
*
* Typical usecase:
* - Initialize the model fields with values from filter form.
* - Execute this method to get CActiveDataProvider instance which will filter
* models according to data in model fields.
* - Pass data provider to CGridView, CListView or any similar widget.
*
* @return CActiveDataProvider the data provider that can return the models
* based on the search/filter conditions.
*/
public function search()
{
// @todo Please modify the following code to remove attributes that should not be searched.
$criteria=new CDbCriteria;
$criteria->compare('id',$this->id);
$criteria->compare('image',$this->image,true);
$criteria->compare('post_id',$this->post_id);
return new CActiveDataProvider($this, array(
'criteria'=>$criteria,
));
}
/**
* Returns the static model of the specified AR class.
* Please note that you should have this exact method in all your CActiveRecord descendants!
* @param string $className active record class name.
* @return PostImage the static model class
*/
public static function model($className=__CLASS__)
{
return parent::model($className);
}
}
这是对形式的看法：
<?php
echo CHtml::form('','post',array('enctype'=>'multipart/form-data'));
echo CHtml::activeFileField($model, 'image');
echo CHtml::endForm();
?>