SF3+Doctrine calculate price between dates - php

Question

So in my Symfony 3 project I need to create a sort of price calculator with takes 3 params: date_from, date_to, guest_number. Table in MySql looks like:
-----------------------------------------------------------------
id | date_from | date_to | people | price
-----------------------------------------------------------------
1 | 2016-01-15 | 2016-04-20 | 1 | 100
-----------------------------------------------------------------
2 | 2016-04-20 | 2016-08-15 | 1 | 200
-----------------------------------------------------------------
3 | 2016-04-20 | 2016-08-15 | 2 | 250
For example, someone choose 2016-01-01 till 2016-01-10 for 1 guest. Calculator should return 1000. And it is no big deal to create SQL statement for this
Example 2, someone choose 2016-04-15 til 2016-04-25 for 1 person.
The question is how can I build with Doctrine QueryBuilder statement which would calculate 'n' days from one period multiply price and 'n' days from another period multiply corresponding price?

Answer 1

Let's say you have an entity Calendar:
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="CalendarRepository")
* #ORM\Table(name="calendar")
*/
class Calendar
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="date")
*/
private $dateFrom;
/**
* #ORM\Column(type="date")
*/
private $dateTo;
/**
* #ORM\Column(type="integer")
*/
private $people;
/**
* #ORM\Column(type="integer")
*/
private $price;
}
Then your repository class could look like this:
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\EntityRepository;
class CalendarRepository extends EntityRepository
{
public function findPriceFor(\DateTime $dateFrom, \DateTime $dateTo, $nrOfPeople)
{
$qb = $this->createQueryBuilder('calendar');
$qb->select('SUM(
CASE
WHEN calendar.dateFrom >= :dateFromChosen AND calendar.dateTo >= :dateToChosen THEN DATE_DIFF(:dateToChosen, calendar.dateFrom)
WHEN calendar.dateFrom <= :dateFromChosen AND calendar.dateTo >= :dateToChosen THEN DATE_DIFF(:dateToChosen, :dateFromChosen)
WHEN calendar.dateFrom <= :dateFromChosen AND calendar.dateTo <= :dateToChosen THEN DATE_DIFF(calendar.dateTo, :dateFromChosen)
WHEN calendar.dateFrom >= :dateFromChosen AND calendar.dateTo <= :dateToChosen THEN DATE_DIFF(calendar.dateTo, calendar.dateFrom)
ELSE 0
END
)*calendar.price AS intervalPrice');
$qb->andWhere('calendar.people = :nrOfPeople')
->andWhere(
$qb->expr()->andX(
$qb->expr()->lt('calendar.dateFrom', ':dateToChosen'),
$qb->expr()->gt('calendar.dateTo', ':dateFromChosen')
)
);
$qb->setParameter('nrOfPeople', $nrOfPeople)
->setParameter('dateFromChosen', $dateFrom->format('Y-m-d'))
->setParameter('dateToChosen', $dateTo->format('Y-m-d'));
$qb->groupBy('calendar.id');
$query = $qb->getQuery();
$resultArray = $query->execute();
$totalPrice = array_sum(array_column($resultArray, 'intervalPrice'));
return $totalPrice;
}
}
If we took your example MySQL table, and decide to calculate a price for 1 person, from "2016-04-15" to "2016-04-25", then result would be this: