EasyAdmin 4.27.0: Fix Crash From Querying All Table Rows

by Alex Johnson 57 views

Experiencing crashes with EasyAdminBundle 4.27.0? You're not alone! A recent issue has been identified where version 4.27.0 generates a problematic SQL query that attempts to retrieve all rows from a table. This can lead to excessive memory usage and application crashes, especially when dealing with large datasets. In this article, we'll dive into the details of this issue, explore the root cause, and discuss potential solutions and workarounds.

The Problem: Unrestrained SQL Queries

The core of the issue lies in how EasyAdminBundle 4.27.0 constructs its SQL queries in certain scenarios. Specifically, it generates a SELECT statement without any WHERE clause, effectively requesting all rows from a table. When the table contains millions of records, this can quickly exhaust available memory, resulting in a crash. This issue was highlighted by a user who encountered the following SQL being executed:

SELECT v0_.foo1 AS foo1_0,
       v0_.foo2 AS foo2_1,
       v0_.foo3 AS foo3_2,
       v0_.foo4 AS foo4_3,
       v0_.foo5 AS foo5_4,
       v0_.foo6 AS foo6_5,
       v0_.foo7 AS foo7_6,
       v0_.foo8 AS foo8_7,
       v0_.foo9 AS foo9_8,
       v0_.foo10 AS foo10_9,
       v0_.foo11 AS foo11_10,
       v0_.foo12 AS foo12_11,
       v0_.foo13 AS foo13_12,
       v0_.foo14 AS foo14_13,
       v0_.foo15 AS foo15_14,
       v0_.foo16 AS foo16_15,
       v0_.foo17 AS foo17_16,
       v0_.foo18 AS foo18_17
FROM foos v0_

The user reported that this query, executed against a table with millions of rows, caused the application to run out of memory and crash. This highlights a critical performance bottleneck introduced in version 4.27.0. Understanding the context in which this query is generated is key to finding a solution.

Diving Deeper: Stack Trace Analysis

To pinpoint the exact location where this query is being generated, a stack trace was provided. Let's break down the relevant parts of the stack trace to understand the sequence of events leading to the problematic SQL execution:

#0 /Users/simo/Projects/Foo/Bar/vendor/doctrine/orm/src/Query/Exec/FinalizedSelectExecutor.php(27): Doctrine\DBAL\Connection->executeQuery('SELECT v0_.foo1...', Array, Array, NULL)
#1 /Users/simo/Projects/Foo/Bar/vendor/doctrine/orm/src/Query.php(296): Doctrine\ORM\Query\Exec\FinalizedSelectExecutor->execute(Object(Doctrine\DBAL\Connection), Array, Array)
#2 /Users/simo/Projects/Foo/Bar/vendor/doctrine/orm/src/AbstractQuery.php(930): Doctrine\ORM\Query->_doExecute()
#3 /Users/simo/Projects/Foo/Bar/vendor/doctrine/orm/src/AbstractQuery.php(886): Doctrine\ORM\AbstractQuery->executeIgnoreQueryCache(NULL, NULL)
#4 /Users/simo/Projects/Foo/Bar/vendor/symfony/doctrine-bridge/Form/ChoiceList/ORMQueryBuilderLoader.php(35): Doctrine\ORM\AbstractQuery->execute()
#5 /Users/simo/Projects/Foo/Bar/vendor/symfony/doctrine-bridge/Form/ChoiceList/DoctrineChoiceLoader.php(53): Symfony\Bridge\Doctrine\Form\ChoiceList\ORMQueryBuilderLoader->getEntities()
#6 /Users/simo/Projects/Foo/Bar/vendor/symfony/form/ChoiceList/Loader/AbstractChoiceLoader.php(29): Symfony\Bridge\Doctrine\Form\ChoiceList\DoctrineChoiceLoader->loadChoices()
#7 /Users/simo/Projects/Foo/Bar/vendor/symfony/form/ChoiceList/LazyChoiceList.php(56): Symfony\Component\Form\ChoiceList\Loader\AbstractChoiceLoader->loadChoiceList(Object(Closure))
#8 /Users/simo/Projects/Foo/Bar/vendor/symfony/form/ChoiceList/Factory/DefaultChoiceListFactory.php(60): Symfony\Component\Form\ChoiceList\LazyChoiceList->getChoices()
#9 /Users/simo/Projects/Foo/Bar/vendor/symfony/form/ChoiceList/Factory/PropertyAccessDecorator.php(178): Symfony\Component\Form\ChoiceList\Factory\DefaultChoiceListFactory->createView(Object(Symfony\Component\Form\ChoiceList\LazyChoiceList), Array, Object(Closure), Object(Closure), NULL, NULL, Array, true)
#10 /Users/simo/Projects/Foo/Bar/vendor/symfony/form/ChoiceList/Factory/CachingFactoryDecorator.php(202): Symfony\Component\Form\ChoiceList\Factory\PropertyAccessDecorator->createView(Object(Symfony\Component\Form\ChoiceList\LazyChoiceList), Array, Object(Closure), Object(Closure), NULL, NULL, Array, true)
#11 /Users/simo/Projects/Foo/Bar/vendor/symfony/form/Extension/Core/Type/ChoiceType.php(479): Symfony\Component\Form\ChoiceList\Factory\CachingFactoryDecorator->createView(Object(Symfony\Component\Form\ChoiceList\LazyChoiceList), Array, Object(Closure), Object(Closure), NULL, NULL, Array, true)
#12 /Users/simo/Projects/Foo/Bar/vendor/symfony/form/Extension/Core/Type/ChoiceType.php(234): Symfony\Component\Form\Extension\Core\Type\ChoiceType->createChoiceListView(Object(Symfony\Component\Form\ChoiceList\LazyChoiceList), Array)
...
#24 /Users/simo/Projects/Foo/Bar/vendor/easycorp/easyadmin-bundle/src/EventListener/CrudResponseListener.php(44): Symfony\Component\Form\Form->createView()
...

From the stack trace, we can trace the execution flow:

  1. The query is executed by Doctrine's FinalizedSelectExecutor (#0).
  2. It originates from a Doctrine ORM Query object (#1, #2, #3).
  3. The query is triggered by ORMQueryBuilderLoader within the Symfony Doctrine Bridge (#4).
  4. This loader is used in the context of a Symfony ChoiceList (#5, #6, #7, #8).
  5. The ChoiceList is being created for a Symfony ChoiceType form field (#11, #12).
  6. The ChoiceType is likely part of a CollectionType (#19), which is a common way to handle relationships in forms.
  7. Finally, the process is initiated within EasyAdminBundle's CrudResponseListener when creating the form view (#24).

This analysis suggests that the issue is related to how EasyAdminBundle, in conjunction with Symfony Forms and Doctrine, handles choice lists, particularly within CollectionField types. The ChoiceType is attempting to load all entities for a potentially large table, leading to the memory exhaustion.

The Culprit: CollectionField and Choice Loading

The user who reported the issue correctly identified the CollectionField as a potential source. CollectionField in EasyAdmin is used to manage collections of related entities. When rendering a form with a CollectionField, EasyAdmin often uses a ChoiceType field to allow selecting from existing related entities. This is where the problem arises.

If the ChoiceType field is configured to load all available options (entities) without any filtering, it will generate the problematic SQL query. This is especially true if the related entity has a large number of records in the database.

The fact that it