tutorial - problema de php yii framework con objetos(2)

yii2 basic

Question

Esto es algo así como la continuación de la pregunta que ya publiqué " php yii framework issue with objects ", pero surgió un nuevo problema, así que estoy publicando una nueva pregunta para una mejor visualización del código y una explicación de lo que está mal. Esta es la parte problemática del código:

<?php $this->widget(''zii.widgets.grid.CGridView'', array(
''id''=>''predmet-grid'',
''dataProvider''=>$model->search(),
''filter''=>$model,
''columns''=>array(
    //array(
    //  ''name''=>''naziv'',
    //  ''value''=>$model->studijskiProgram->naziv,
    //),
    ''sp_id'',
    ''naziv'',
    ''semestar'',
    ''predavanja'',
    ''vjezbe'',
    //array(
    //  ''class''=>''CButtonColumn'',
    //),
),
)); ?>

Y este es el código de la clase modelo donde se ubican las relaciones:

<?php

/**
* This is the model class for table "predmet".
*
* The followings are the available columns in table ''predmet'':
* @property integer $id
* @property integer $sp_id
* @property string $naziv
* @property integer $semestar
* @property integer $predavanja
* @property integer $vjezbe
*/
   class Predmet extends CActiveRecord
   {
     /**
     * Returns the static model of the specified AR class.
     * @param string $className active record class name.
     * @return Predmet the static model class
     */

const STATUS_O = "O";
const STATUS_I = "I";
const STATUS_VP = "VP";

public static function model($className=__CLASS__)
{
    return parent::model($className);
}

/**
 * @return string the associated database table name
 */
public function tableName()
{
    return ''predmet'';
}

/**
 * @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(''sp_id, naziv, semestar, predavanja, vjezbe, status'', ''required''),
        array(''sp_id, semestar, predavanja, vjezbe'', ''numerical'', ''integerOnly''=>true),
        array(''naziv'', ''length'', ''max''=>100),
        // The following rule is used by search().
        // Please remove those attributes that should not be searched.
        array(''id, sp_id, naziv, semestar, predavanja, vjezbe, status'', ''safe'', ''on''=>''search''),
    );
}

/**
 * @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.

    //POVEZUJEMO PREDMET I STUDIJSKI PROGRAM
    //BELONGS_TO ide za vezu jedan u vise(kad na stranu 1 pisemo kome pripada)
    //HASMANY ili HAS_MANY (?) JE ZA VISE U JEDAN

    /*ovo prvo ''studijskiProgram'' je kao pokazivac na studijski program s kojim je povezan
    Neka imamo $predmet. da bi pristupili nazivu studijskog programa kome pripada, koristicemo:
    $predmet->studijskiProgram->naziv
    */
    return array(
        ''studijskiProgram'' => array(self::BELONGS_TO, ''StudijskiProgram'', ''sp_id'')
    );
}

/**
 * @return array customized attribute labels (name=>label)
 */
public function attributeLabels()
{
    return array(
        ''id'' => ''ID'',
        ''sp_id'' => ''Studijski program'',
        ''naziv'' => ''Naziv'',
        ''semestar'' => ''Semestar'',
        ''predavanja'' => ''Predavanja'',
        ''vjezbe'' => ''Vjezbe'',
        ''status'' => ''Status''
    );
}

/**
 * Retrieves a list of models based on the current search/filter conditions.
 * @return CActiveDataProvider the data provider that can return the models based on the search/filter conditions.
 */
public function search()
{
    // Warning: Please modify the following code to remove attributes that
    // should not be searched.

    $criteria=new CDbCriteria;

    $criteria->compare(''id'',$this->id);
    $criteria->compare(''sp_id'',$this->sp_id);
    $criteria->compare(''naziv'',$this->naziv,true);
    $criteria->compare(''semestar'',$this->semestar);
    $criteria->compare(''predavanja'',$this->predavanja);
    $criteria->compare(''vjezbe'',$this->vjezbe);

    return new CActiveDataProvider($this, array(
        ''criteria''=>$criteria,
    ));
}


//Funkcija za punjenje Combo box-a (Wombo)
public function uzmiStatusPredmeta()
{
    return array(
            self::STATUS_O => ''Obavezni'',
            self::STATUS_I => ''Izborni'',
            self::STATUS_VP => ''VP''
    );
}

public function uzmiSpisakStudijskihPrograma()
{
    $query = ''select id, naziv from studijski_program'';
    $rezultat = Yii::app()->db->createCommand($query)->queryAll();
    $spisak = CHtml::listData($rezultat,''id'',''naziv'');  //prikazuje naziv, krije ID(valjda radi combo boxa-wombo ?)

    return $spisak;
}
public function vratiProgram()
{
    $query = ''select s.naziv 
    from studijski_program s,predmet p
    where p.sp_id = s.id'';
    $rezultat = Yii::app()->db->createCommand($query)->queryScalar();
    //$rezultat1 = implode($rezultat);
    //$rezultat2 = implode($rezultat1);
    return $rezultat;
}
public function vratiProgramId()
{
    $query = ''select s.id 
    from studijski_program s,predmet p
    where p.sp_id = s.id'';
    $rezultat = Yii::app()->db->createCommand($query)->queryScalar();
    //$rezultat1 = implode($rezultat);
    //$rezultat2 = implode($rezultat1);
    return $rezultat;
}

}

Como puede ver aquí, existe una relación con "studijskiProgram" aquí utilizando la clave foránea "sp_id" en "predmet". Sin embargo, cuando estoy tratando de acceder a "naziv" proprety de "studijskiProgram" en la parte superior del código de esta manera:

    array(
        ''name''=>''naziv'',
        ''value''=>$model->studijskiProgram->naziv,
    ),

que fue la solución con la pregunta anterior donde se usa el widget CDeatilView. Por alguna razón, lo mismo aquí no funciona e informa el error de tratar de obtener una propiedad de un objeto no. ¿Alguna idea de qué alterar para que funcione?

Answer 1

Escribe tu código como beow: -

 // CGridView column definition:
        ''columns''=>array(
            array(
                ''name''=>''naziv'',
                ''value''=>''$data->studijskiProgram->naziv'',
                ''type''=>''text'',
            ),

    // Preparing the DataProvider in the model:
    return new CActiveDataProvider(get_class($this),array(
        ''sort''=>array(
            ''multiSort''=>false,
            ''attributes''=>array(
                ''naziv''=>array(                
                    ''desc''=>''naziv desc'',
                ),

Answer 2

Yii Gridview toma el proveedor de datos y genera las filas. Puedes probar este.

Por favor, mira aquí más detalles. http://www.yiiframework.com/doc/api/1.1/CGridView

array(
    ''name'' => ''naziv'',
    ''value'' => ''(isset($data->studijskiProgram->naziv))?$data->studijskiProgram->naziv:""''

),