Yii2 add condition in the last one of chain relations - database

Question

Right now I have:
$products = Product::findAll([1,2,3,4]);
foreach ($products as $product){
$text = $product->part->type->texts;
}
This returns the related records from Texts table.
But I need to have only 1 record from it, and to do that I need to have one more condition in the last join type->texts, which is not defined in the model. It's dynamic session variable.
Is there any way to do this?

Answer 1

If you want modify the last relation query to have additional condition and return one record instead of many, simply change last relation call like so:
$text = $product->part->type->getTexts()->andWhere(...)->one();
Direct relation method call returns yii\db\ActiveQuery instance so you can modify conditions how you want.
If you want to use modified relation in more than just one place, create separate method for that:
/**
* #return yii\db\ActiveQuery
*/
public function getDynamicText()
{
// Insert link from texts relation similar as in hasMany() and additional condition in andWhere()
return $this->hasOne(...)->andWhere(...);
}
And then use it:
$text = $product->part->type->dynamicText;

Answer 2

In this case, scopes would be a handy solution, especially if you're going to use complicated conditions.
1. Start by creating a model that extends ActiveQuery with a method that will be used to add conditions to your query, for example active = 1:
namespace app\models;
use yii\db\ActiveQuery;
class TextQuery extends ActiveQuery
{
public function active($state = 1)
{
$this->andWhere(['active' => $state]); // or any other condition
return $this;
}
}
2. Override the find() method in your Text model:
public static function find()
{
return new \app\models\TextQuery(get_called_class());
}
3. Add a method in your Type model that retrieves your relational data via the newly made scope:
public function getActiveText()
{
return $this->hasMany(Text::className(), ['type_id' => 'id'])->active();
}
Finally, use it as follows:
$text = $product->part->type->activeText;
The docs are pretty clear on this, check 'em out.