Yii saving many MANY_MANY relationships - php

Question

Info
I'm having some issues with saving a model that has many MANY_MANY relationships. I have a page where you can add product attributes as well as product attribute levels. What I now want to do is add support for this on the update-page on the product. So when I enter the update-page, I will see all product attributes, and for each product attribute, there will be a drop-down list with the related product attribute levels for that specific product attribute.
Database
Product
id
etc
ProductAttribute
id
etc
ProductAttributeLevel
id
product_attribute_id ## FK
etc
ProductProductAttributeLevel -- This is the pivot-table
product_id ## FK PK
product_attribute_level_id ## FK PK
ActiveRecords
Product:
class Product extends S360ActiveRecord {
public function behaviors() {
return array('CAdvancedArBehavior' => array(
'class' => 'application.extensions.CAdvancedArBehavior')
);
}
public function rules() {
return array(
array('attributeLevels', 'safe'),
);
}
public function relations() {
return array(
'attributeLevels' => array(self::MANY_MANY,
'ProductAttributeLevel',
'product_product_attribute_level(product_id,product_attribute_level_id)'
),
);
}
}
ProductAttribute:
class ProductAttribute extends S360ActiveRecord {
public function relations() {
return array(
'levels' => array(self::HAS_MANY, 'ProductAttributeLevel', 'product_attribute_id'),
);
}
}
ProductAttributeLevel:
class ProductAttributeLevel extends S360ActiveRecord {
public function relations() {
return array(
'productAttribute' => array(self::BELONGS_TO, 'ProductAttribute', 'product_attribute_id'),
'products' => array(self::MANY_MANY, 'Product', 'product_product_attribute_level(product_attribute_level_id,product_id)'),
);
}
}
ProductProductAttributeLevel:
class ProductProductAttributeLevel extends S360ActiveRecord {
public function relations()
{
return array(
'productAttributeLevel' => array(self::BELONGS_TO, 'ProductAttributeLevel', 'product_attribute_level_id'),
'product' => array(self::BELONGS_TO, 'Product', 'product_id'),
);
}
}
My ProductController method that updates a product looks like this:
public function actionUpdate($id) {
$model = $this->loadModel($id);
$this->performAjaxValidation($model);
if (isset($_POST['Product'])) {
$model->attributes = $_POST['Product'];
if ($model->save()) {
$this->redirect(array('index'));
}
}
$this->render('update', array('model' => $model));
}
Relevant part in my form-view:
<?php
$form=$this->beginWidget('S360ActiveForm', array(
'id' => 'product-form',
'enableAjaxValidation' => true,
));
?>
<?php $attributes = ProductAttribute::model()->findAllByAttributes(array('survey_id' => $model->parent_id)); if ($attributes): ?>
<div class="span6">
<?php foreach ($attributes as $attribute) {
echo $form->dropDownListRow($model, 'attributeLevels',
CMap::mergeArray(
array('0' => Yii::t('backend','No attribute level')),
CHtml::listData($attribute->levels, 'id', 'label')
),
array('class' => 'span5')
);
}?>
</div>
<?php endif; ?>
Issue
I get this CDBException:
CDbCommand failed to execute the SQL statement: SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (product_product_attribute_level, CONSTRAINT product_product_attribute_level_ibfk_2 FOREIGN KEY (product_attribute_level_id) REFERENCES product_attribute_level (id) ON DELE). The SQL statement executed was: insert into product_product_attribute_level (product_id, product_attribute_level_id) values ('5', '0')
Problem is though that product_attribute_level with id "0" does not exist, the id's starts at "1". How would I change it so that it inserts the correct id-number?
Example of what I want
Let's say I have 2 product attributes; Attribute1 and Attribute2.
Attribute1 have product attribute levels Attribute1_Level1 and Attribute1_Level2.
Attribute2 have product attribute levels Attribute2_Level1, Attribute2_Level2 and Attribute2_Level3.
When I go to my Product edit-/update -page, I want to see this:
Attributes http://img201.imageshack.us/img201/9252/screenshot20130207at103.png
Attribute2 Dropdown http://img405.imageshack.us/img405/9252/screenshot20130207at103.png
The Product belongs to a Survey. The Product Attribute's belongs to a Survey as well so fetching all the Product Attributes that the Product can have is easy:
$attributes = ProductAttribute::model()->findAllByAttributes(array('survey_id' => $product->survey_id));
After this I need to fetch all Product Attribute Levels that belongs to each attribute, which is quite easy as well:
foreach ($attributes as $attribute) {
echo $form->dropDownList($attribute, 'label',
CHtml::listData($attribute->levels, 'id', 'label'),
$htmlOptions
);
}
The problem is how to connect it with the Product and have its "$product->attributeLevels" relationship update accordingly based on what I select from the different dropdowns. $product->attributeLevels should be a list of ProductAttributeLevel and should be stored via the table "product_product_attribute_level".

Answer 1

And of course you are selecting from the dropdown? because if not you are indeed sending a '0'
<?php foreach ($attributes as $attribute) {
echo $form->dropDownListRow($model, 'attributeLevels',
CMap::mergeArray(
// **HERE**
array('0' => Yii::t('backend','No attribute level')),
CHtml::listData($attribute->levels, 'id', 'label')
),
array('class' => 'span5')
);
}?>
If what you want is to have something as the first option that doesn't represents a record, there are two options, use the prompt or the empty attributes of dropDownList, from the docs:
prompt: string, specifies the prompt text shown as the first list option. Its value is empty. Note, the prompt text will NOT be
HTML-encoded.
empty: string, specifies the text corresponding to empty selection. Its value is empty. The 'empty' option can also be an array
of value-label pairs. Each pair will be used to render a list option
at the beginning. Note, the text label will NOT be HTML-encoded.
Now, you want a dropdown list of attributeLevels, but you want them saved on the product. so iterate over the attributes, get its levels, but save them on the product, like this:
<?php foreach ($attributes as $i => $attribute) {
echo $form->dropDownListRow($product, "[$i]attributeLevels",
CHtml::listData($attribute->levels, 'id', 'label'),
array('class' => 'span5', 'prompt' => 'No attribute level')
);
}?>
Now to save them on your product, do this in your controller:
public function actionUpdate($id) {
$model = $this->loadModel($id);
$this->performAjaxValidation($model);
if (isset($_POST['Product'])) {
$attrLevels = $_POST['Product']['attributeLevels'];
unset($_POST['Product']['attributeLevels']);
$model->attributes = $_POST['Product'];
if( $model->save() ) {
$valid=true;
foreach($attrLevels as $i=>$attrLevel)
{
$pivot = new ProductProductAttributeLevel;
$pivot->product_id = $model->id;
$pivot->product_attribute_level_id = $attrLevel;
$valid=$item->save() && $valid;
}
if($valid){
$this->redirect(array('index'));
}
}
}
$this->render('update', array('model' => $model));
}
Disclaimer: copy/paste may not work, but you get the idea