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Overview

When dealing with lists of attributes, especially arbitrary properties, it’s crucial to manage the length of list. You can use prompting and enumeration to limit the list length, ensuring a manageable set of properties.

To be 100% certain the list does not exceed the limit, add extra validation, e.g. using ValidationMixin (see: Validation).

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Example

<?php

$loader = require 'vendor/autoload.php';

$loader->add('Cognesy\\Instructor\\', __DIR__.'../../src/');



use Cognesy\Instructor\Features\Validation\Traits\ValidationMixin;

use Cognesy\Instructor\Features\Validation\ValidationResult;

use Cognesy\Instructor\Instructor;



class Property

{

    /**  Monotonically increasing ID, not larger than 2 */

    public string $index;

    public string $key;

    public string $value;

}



class UserDetail

{

    use ValidationMixin;



    public int $age;

    public string $name;

    /** @var Property[] List other extracted properties - not more than 2. */

    public array $properties;



    public function validate() : ValidationResult

    {

        if (count($this->properties) < 3) {

            return ValidationResult::valid();

        }

        return ValidationResult::fieldError(

            field: 'properties',

            value: $this->name,

            message: "Number of properties must be not more than 2.",

        );

    }

}



$text = <<<TEXT

    Jason is 25 years old. He is a programmer. He has a car. He lives in

    a small house in Alamo. He likes to play guitar.

    TEXT;



$user = (new Instructor)->respond(

    messages: [['role' => 'user', 'content' => $text]],

    responseModel: UserDetail::class,

    maxRetries: 1 // change to 0 to see validation error

);



dump($user);



assert($user->age === 25);

assert($user->name === "Jason");

assert(count($user->properties) < 3);

?>
Handling errorsReflection Prompting