Formula Doctrine Bundle

Symfony bundle for integrating cryonighter/formula-doctrine into Symfony applications.

It enables Hibernate-style #[Formula] computed fields for Doctrine ORM entities and wires the required Doctrine metadata listeners, SQL walker configuration and DBAL middleware automatically through Symfony's dependency injection container.

Use it when you want read-only entity properties whose values are computed by DQL/SQL expressions, subqueries, aggregations or joins — without adding physical database columns and without introducing N+1 queries.

Example with native SQL subquery – must be enclosed in parentheses:

#[ORM\Entity]
class Customer
{
    #[Formula('(SELECT COUNT(*) FROM orders o WHERE o.customer_id = {this}.id)')]
    public int $orderCount = 0;
}

Example using DQL subquery – should not be enclosed in parentheses:

#[ORM\Entity]
class Customer
{
    #[Formula('SELECT COUNT(o) FROM App\Entity\Order o WHERE o.customer = {this}')]
    public int $orderCount = 0;
}

With this bundle installed, formula fields are populated automatically when entities are loaded through Doctrine in a Symfony application. The bundle keeps your entity code focused on the #[Formula] attributes while taking care of registering the integration services needed by cryonighter/formula-doctrine.

Requirements

• PHP >= 8.2.0 but the latest stable version of PHP is recommended

Install

Via Composer

composer require cryonighter/formula-doctrine-bundle

The bundle will be automatically registered in config/bundles.php:

return [
    // ...
    Cryonighter\FormulaDoctrine\FormulaDoctrineBundle::class => ['all' => true],
];

Bundle Registration Order

If you use other bundles that extend Doctrine ORM with custom SQL walkers (e.g. Gedmo DoctrineExtensions, API Platform), register FormulaDoctrineBundle last in config/bundles.php:

php
return [
    // ... other bundles ...
    Stof\DoctrineExtensionsBundle\StofDoctrineExtensionsBundle::class => ['all' => true],
    Cryonighter\FormulaDoctrine\FormulaDoctrineBundle::class => ['all' => true], // ← last
];

FormulaDoctrineBundle automatically detects and chains with any previously registered output walker, so both transformations are applied to every query.

If another bundle is registered after FormulaDoctrineBundle and also sets a custom output walker globally, you may need to manually call FormulaDoctrineConfigurator::configure() in your application's bundle.

Usage

Basic example

Add #[Formula] to any property on a Doctrine entity. The property must not be mapped with #[ORM\Column].

use Cryonighter\FormulaDoctrine\Attribute\Formula;
use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity]
#[ORM\Table(name: 'customers')]
class Customer
{
    #[ORM\Id, ORM\Column, ORM\GeneratedValue]
    public int $id;

    #[ORM\Column]
    public string $name;

    // DQL — must NOT be enclosed in parentheses
    #[Formula('SELECT COUNT(o) FROM App\Entity\Order o WHERE o.customer = {this}')]
    public int $orderCount = 0;

    // Native SQL — must be enclosed in parentheses
    #[Formula('(SELECT COALESCE(SUM(oi.price), 0) FROM order_items oi JOIN orders o ON oi.order_id = o.id WHERE o.customer_id = {this}.id)')]
    public float $totalRevenue = 0.0;

    // Nullable formula
    #[Formula('(SELECT MAX(o.created_at) FROM orders o WHERE o.customer_id = {this}.id)')]
    public ?string $lastOrderDate = null;
}

Fetching entities

No changes to your query code are needed. Formula fields are populated automatically on every DQL SELECT:

$customers = $entityManager
    ->createQuery('SELECT c FROM App\Entity\Customer c')
    ->getResult();

foreach ($customers as $customer) {
    echo $customer->orderCount;    // populated from subquery
    echo $customer->totalRevenue;  // populated from subquery
}

A single SQL query is executed — no N+1:

SELECT c0_.id AS id_0,
       c0_.name AS name_1,
       (SELECT COUNT(o0_.id) AS sclr_1 FROM orders o0_ WHERE o0_.customer_id = c0_.id) AS orderCount_2,
       (SELECT COALESCE(SUM(oi.price), 0) FROM order_items oi JOIN orders o ON oi.order_id = o.id WHERE o.customer_id = c0_.id) AS totalRevenue_3,
       (SELECT MAX(o.created_at) FROM orders o WHERE o.customer_id = c0_.id) AS lastOrderDate_4
FROM customers c0_

QueryBuilder

Works with QueryBuilder too:

$customers = $entityManager
    ->createQueryBuilder()
    ->select('c')
    ->from(Customer::class, 'c')
    ->where('c.name LIKE :name')
    ->setParameter('name', '%Acme%')
    ->getQuery()
    ->getResult();

And in the repositories too:

class CustomerRepository extends ServiceEntityRepository
{
    public function findTopCustomers(int $limit): array
    {
        return $this->createQueryBuilder('c')
            ->orderBy('c.id', 'ASC')
            ->setMaxResults($limit)
            ->getQuery()
            ->getResult();
        // $result[0]->totalRevenue is populated automatically
    }
}

Methods find(), findBy(), findOneBy() and findAll() are also supported:

$customerRepository = $this->em->getRepository(Customer::class);

$customers = $customerRepository->findAll();

echo $customer[0]->orderCount;    // populated from subquery
echo $customer[0]->totalRevenue;  // populated from subquery

Using formula fields in queries

Formula fields can be used in WHERE, ORDER BY, GROUP BY and HAVING clauses just like regular entity properties:

WHERE clause

Filter entities by computed values:

// DQL
$customers = $entityManager
    ->createQuery('SELECT c FROM App\Entity\Customer c WHERE c.orderCount > :minOrders')
    ->setParameter('minOrders', 5)
    ->getResult();

// QueryBuilder
$customers = $entityManager
    ->createQueryBuilder()
    ->select('c')
    ->from(Customer::class, 'c')
    ->where('c.totalRevenue >= :minRevenue')
    ->setParameter('minRevenue', 1000.0)
    ->getQuery()
    ->getResult();

// Repository findBy()
$customers = $customerRepository->findBy(['orderCount' => 10]);

ORDER BY clause

Sort by formula fields:

// DQL
$customers = $entityManager
    ->createQuery('SELECT c FROM App\Entity\Customer c ORDER BY c.totalRevenue DESC')
    ->getResult();

// QueryBuilder
$customers = $entityManager
    ->createQueryBuilder()
    ->select('c')
    ->from(Customer::class, 'c')
    ->orderBy('c.orderCount', 'DESC')
    ->getQuery()
    ->getResult();

// Repository findBy() with ordering
$customers = $customerRepository->findBy(
    [],
    ['totalRevenue' => 'DESC']
);

GROUP BY and HAVING clauses

Aggregate and filter by computed values:

// Group customers by order count and filter groups
$result = $entityManager
    ->createQuery('
        SELECT c.orderCount, COUNT(c.id) as customerCount, AVG(c.totalRevenue) as avgRevenue
        FROM App\Entity\Customer c
        GROUP BY c.orderCount
        HAVING c.orderCount >= :minOrders AND COUNT(c.id) > :minCustomers
        ORDER BY c.orderCount DESC
    ')
    ->setParameter('minOrders', 3)
    ->setParameter('minCustomers', 1)
    ->getResult();

// Result example:
// [
//   ['orderCount' => 10, 'customerCount' => 5, 'avgRevenue' => 15000.50],
//   ['orderCount' => 7,  'customerCount' => 3, 'avgRevenue' => 8500.25],
//   ...
// ]

Combined example

All clauses together in a single query:

$result = $entityManager
    ->createQuery('
        SELECT c.orderCount, COUNT(c.id) as total
        FROM App\Entity\Customer c
        WHERE c.totalRevenue > :minRevenue
        GROUP BY c.orderCount
        HAVING c.orderCount BETWEEN :minOrders AND :maxOrders
        ORDER BY c.orderCount DESC
    ')
    ->setParameter('minRevenue', 500.0)
    ->setParameter('minOrders', 2)
    ->setParameter('maxOrders', 10)
    ->getResult();

Note: Formula fields work transparently in all query clauses. The SQL subquery is embedded only once per query, not per clause usage.

Aggregate functions

All DQL aggregate functions (e.g. COUNT, SUM, AVG, MIN, MAX) work with formula fields out of the box:

$result = $entityManager
    ->createQueryBuilder()
    ->select(
        'SUM(c.orderCount) as totalOrders',
        'AVG(c.totalRevenue) as avgRevenue',
        'MAX(c.totalRevenue) as maxRevenue',
        'MIN(c.totalRevenue) as minRevenue',
    )
    ->from(Customer::class, 'c')
    ->getQuery()
    ->getSingleResult();

// Result example:
// [
//   'totalOrders' => 42,
//   'avgRevenue'  => 1500.50,
//   'maxRevenue'  => 9800.00,
//   'minRevenue'  => 0.0,
// ]

Note: MIN and MAX ignore NULL values — so nullable formula fields (e.g. ?float $maxOrderTotal) behave correctly even when some entities have no related records.

CASE WHEN expressions

Formula fields can be used inside CASE WHEN ... THEN ... END expressions directly in DQL — for categorisation, conditional sorting and custom labels:

// Categorise customers by revenue tier
$result = $entityManager
   ->createQuery('
        SELECT c.name, c.totalRevenue,
            CASE
                WHEN c.totalRevenue = 0    THEN \'none\'
                WHEN c.totalRevenue < 500  THEN \'low\'
                WHEN c.totalRevenue < 5000 THEN \'medium\'
                ELSE                            \'high\'
            END as revenueCategory
        FROM App\Entity\Customer c
        ORDER BY c.totalRevenue ASC
  ')
  ->getResult();

// Result example:
// [
//   ['name' => 'Alice', 'totalRevenue' => 0.0,    'revenueCategory' => 'none'],
//   ['name' => 'Bob',   'totalRevenue' => 320.0,  'revenueCategory' => 'low'],
//   ['name' => 'Carol', 'totalRevenue' => 1500.0, 'revenueCategory' => 'medium'],
//   ['name' => 'Dave',  'totalRevenue' => 9800.0, 'revenueCategory' => 'high'],
// ]

// CASE WHEN in ORDER BY — push inactive customers to the end
$result = $entityManager
    ->createQuery('
        SELECT c.name, c.orderCount
        FROM App\Entity\Customer c
        ORDER BY CASE WHEN c.orderCount = 0 THEN 1 ELSE 0 END ASC, c.orderCount DESC
    ')
    ->getResult();

Nullable fields

If a formula can return NULL (e.g. MAX on an empty set), declare the property as nullable — the type is inferred automatically:

#[Formula('(SELECT MAX(o.total) FROM orders o WHERE o.customer_id = {this}.id)')]
public ?float $maxOrderTotal = null;

The {this} placeholder

Use {this} to reference the root entity's table alias in the native SQL expression or root entity itself in the DQL expression.

In native SQL, {this} is resolved to the actual Doctrine-generated table alias (e.g. c0_):

// {this} → c0_ (SQL table alias)
#[Formula('(SELECT COUNT(*) FROM orders o WHERE o.customer_id = {this}.id)')]
public int $orderCount = 0;

In DQL, {this} refers to the root entity itself, so you compare against the entity reference directly — without a field suffix:

// {this} → the root entity alias
#[Formula('SELECT COUNT(o) FROM App\Entity\Order o WHERE o.customer = {this}')]
public int $orderCount = 0;

Do not hardcode the table name or alias directly — it will break when Doctrine generates a different alias.

Custom SELECT alias

By default the SQL column alias matches the property name. Override it with the alias parameter:

#[Formula(
    sql: '(SELECT COUNT(*) FROM orders o WHERE o.customer_id = {this}.id)',
    alias: 'total_orders',
)]
public int $orderCount = 0;

Use a custom alias only when you need to control the raw SQL column name, e.g. for compatibility with a specific reporting tool.

Nested Formulas

A #[Formula] expression can reference a formula field of another entity. The entire chain is resolved into a single SQL query.

#[ORM\Entity]
class Customer
{
    #[ORM\ManyToOne(targetEntity: Country::class)]
    public Country $country;

    // DQL formula — exposed under alias 'orders'
    #[Formula('SELECT COUNT(o) FROM App\Entity\Order o WHERE o.customer = {this}', alias: 'orders')]
    public int $orderCount = 0;

    // SQL formula — exposed by property name 'totalRevenue'
    #[Formula('(SELECT COALESCE(SUM(oi.price), 0) FROM order_items oi JOIN orders o ON oi.order_id = o.id WHERE o.customer_id = {this}.id)')]
    public float $totalRevenue = 0.0;
}

#[ORM\Entity]
class Country
{
    // SQL formula — references Customer.orderCount by its alias 'orders'
    #[Formula('(SELECT COALESCE(SUM(c.orders), 0) FROM customers c WHERE c.country_id = {this}.id)')]
    public int $customerOrderCount = 0;

    // DQL formula — references Customer.totalRevenue by property name
    #[Formula('SELECT COALESCE(SUM(c.totalRevenue), 0) FROM App\Entity\Customer c WHERE c.country = {this}')]
    public float $customerRevenue = 0.0;
}

Note: In a native SQL expression, reference another formula field by its alias if one is declared (e.g. c.total), or by the property name otherwise. In a DQL expression, always use the property name (e.g. c.orderCount).

UPDATE queries

Formula fields can be used in the WHERE clause of DQL UPDATE queries — filter which entities to update based on computed values:

// Update all customers who placed 10 or more orders
$affected = $entityManager
    ->createQuery('UPDATE App\Entity\Customer c SET c.name = :newName WHERE c.orderCount >= :min')
    ->setParameter('newName', 'VIP')
    ->setParameter('min', 10)
    ->execute();

Note: Formula fields are read-only and are never written to the database. They can only appear in WHERE clauses of UPDATE/DELETE — not in the SET clause.

DELETE queries

Formula fields work identically in DQL DELETE queries:

// Delete customers who have never placed an order
$affected = $entityManager
    ->createQuery('DELETE App\Entity\Customer c WHERE c.orderCount = :count')
    ->setParameter('count', 0)
    ->execute();

How it works

You can read about this in the description of the base package cryonighter/formula-doctrine.

Limitations

Change log

Please see CHANGELOG for more information on what has changed recently.

Testing

# All tests
./vendor/bin/phpunit

# Only unit
./vendor/bin/phpunit --testsuite Unit

# Only integration
./vendor/bin/phpunit --testsuite Integration

# Specific file
./vendor/bin/phpunit tests/Unit/DependencyInjection/FormulaDoctrineCompilerPassTest.php

# With coating (requires Xdebug or PCOV)
./vendor/bin/phpunit --coverage-text

Contributing

Please see CONTRIBUTING and CODE_OF_CONDUCT for details.

Security

If you discover any security related issues, please email [email protected] instead of using the issue tracker.

Credits

• Andrey Reshetchenko

License

The MIT License (MIT). Please see License File for more information.