Yii display multiple Child elements as links in a CGridView Field - php

Question

I have the following table:
CREATE TABLE "place" (
"id" int8 NOT NULL DEFAULT nextval('place_id_seq'::regclass),
"name" varchar(128) NOT NULL,
"parent" int8,
"description" varchar(100)
)
WITH (OIDS=FALSE);
(It's PostgreSQL but this shouldn't be relevant here)
I created the CRUD through giix and changed a bit the relations to match my needs. So I ended up with:
public function relations() {
return array(
'parent0' => array(self::BELONGS_TO, 'Places', 'parent'),
'places' => array(self::HAS_MANY, 'Places', 'parent'),
);
}
The goal here is that a place can belong to another place and have multiple children places.
My problem is that I need to change the admin action to match the following grid:
Print manipulated by the inspector to reflect the desired behaviour
So my problem is to get the list of all the children objects and display it as a list of links. I tried change the respective admin.php view file for:
$this->widget('zii.widgets.grid.CGridView', array(
'id' => 'places-grid',
'dataProvider' => new CActiveDataProvider('Places', array('id'=>$model->places)),
'filter' => $model,
'columns' => array(
array(
'name'=>'parent',
'value'=>'GxHtml::valueEx($data->parent0)',
'filter'=>GxHtml::listDataEx(Places::model()->findAllAttributes(null, true)),
),
'name',
'places',
array(
'class' => 'CButtonColumn',
),
),
));
But this, as expected, throughs an error:
htmlspecialchars() expects parameter 1 to be string, array given
Also I don't know this would even work with the built in avanced search.
Could anyone kindly point me into the correct direction here?

Answer 1

After much search I found a way to solve my problem. Not sure if it's the best way but it works nicely:
$this->widget('zii.widgets.grid.CGridView', array(
'id' => 'places-grid',
'dataProvider' => new CActiveDataProvider('Places', array('id'=>$model->places)),
'filter' => $model,
'columns' => array(
array(
'name'=>'parent',
'value'=>'GxHtml::valueEx($data->parent0)',
'filter'=>GxHtml::listDataEx(Places::model()->findAllAttributes(null, true)),
),
'name',
array(
'header'=>'Children',
'type'=>'html',
'value'=> function($data) {
$placesLinks = array();
foreach ($data->places as $place) {
$placesLinks[] = GxHtml::link(GxHtml::encode(GxHtml::valueEx($place, 'name')), array('places/view', 'id' => GxActiveRecord::extractPkValue($place, true)));
}
return implode(', ', $placesLinks);
}
),
array(
'class' => 'CButtonColumn',
),
),
));
This uses Giix. If you don't use that then you'll have to change the link generation accordingly.
Cheers