httpcb/app/models/Data/PasswordLink.php

<?php

namespace App\Model\Data;

use Httpcb\Mvc\Model\Behavior\RandomId as RandomIdBehavior;
use Phalcon\Forms\Element\Date;
use Phalcon\Mvc\Model\Behavior\SoftDelete;

class PasswordLink extends Base
{
    /**
     * @var int
     */
    protected $id;

    /**
     * @var string
     */
    protected $public_id;

    /**
     * @var int
     */
    protected $user_id;

    /**
     * @var string
     */
    protected $password;

    /**
     * @var string
     */
    protected $date;

    /**
     * Initialize method for model.
     */
    public function initialize()
    {
        $this->setSource('password_link');
        $this->useDynamicUpdate(true);

        // Relationships
        $this->belongsTo('user_id', User::class, 'id', array('alias' => 'User'));

        // Behaviour
        $this->addBehavior(new RandomIdBehavior(array(
            'field' => 'public_id',
            'length' => 12,
            'expression' => '(password IS NULL OR HOUR(TIMEDIFF(date, NOW())) = 0)'
        )));

        $this->addBehavior(new SoftDelete([
            'field' => 'password',
            'value' => null
        ]));
    }

    /**
     * @return int
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * @param int $id
     * @return PasswordLink
     */
    public function setId(int $id) : PasswordLink
    {
        $this->id = $id;
        return $this;
    }

    /**
     * @return string
     */
    public function getPublicId()
    {
        return $this->public_id;
    }

    /**
     * @param string $public_id
     * @return PasswordLink
     */
    public function setPublicId(string $public_id) : PasswordLink
    {
        $this->public_id = $public_id;
        return $this;
    }

    /**
     * @return int
     */
    public function getUserId()
    {
        return $this->user_id;
    }

    /**
     * @param int $user_id
     * @return PasswordLink
     */
    public function setUserId(int $user_id) : PasswordLink
    {
        $this->user_id = $user_id;
        return $this;
    }

    /**
     * @return string
     */
    public function getPassword()
    {
        return $this->password;
    }

    /**
     * @param string $password
     * @return PasswordLink
     */
    public function setPassword(string $password) : PasswordLink
    {
        $this->password = $password;
        return $this;
    }

    /**
     * Has the link been used?
     *
     * @return bool
     */
    public function isUsed() : bool
    {
        return strlen($this->password) < 1;
    }

    /**
     * Is the link still valid?
     *
     * @return bool
     */
    public function isValid() : bool
    {
        // Used links are not valid.
        if ($this->isUsed()) {
            return false;
        }

        $date = new \DateTime($this->date);
        $now = new \DateTime();

        // Get the differerence in hours.
        $diff = $now->format('U') - $date->format('U');
        $diff = ($diff / 60) / 60;

        // Only valid for an hour.
        return $diff >= 0 && $diff <= 1;
    }

    public function beforeCreate()
    {
        // Creating a new link automatically removes old ones.
        $links = self::find(["user_id = ?0", 'bind' => [ $this->user_id ]]);

        foreach($links as $link) {
            $link->delete();
        }
    }
}