Mapping Nested Tree With Doctrine 2 and YAML - doctrine-orm

Question

We are currently working on implementing a nested tree using the DoctrineExtensions module. We believe we have wired everything up correctly, however when we go to flush using Doctrine, we keep getting an Exception.
SyntaxErrorException in AbstractMySQLDriver.php line 90: An exception
occurred while executing 'INSERT INTO ProductTree (left, right,
rootProductTreeID, level, componentProductComponentID) VALUES (?, ?, ?,
?, ?)':
You have an error in your SQL syntax; check the manual that corresponds
to your MySQL server version for the right syntax to use near 'left,
right, rootProductTreeID, level, componentProductComponentID) VALUES (?,
?' at line 1
The code we are using that is triggering this problem is
$productTree->setRootProductComponentID($productComponent->getID());
$productTree->setComponent($productComponent);
$em->persist($productTree);
$em->flush();
And our YAML mapping looks as so
OS\Domain\Entity\Products\ProductTree:
type: entity
repositoryClass: Gedmo\Tree\Entity\Repository\NestedTreeRepository
table: ProductTree
gedmo:
tree:
type: nested
indexes:
rootProductFK_idx:
columns:
- rootProductComponentID
componentProductFK_idx:
columns:
- componentProductComponentID
id:
id:
type: integer
nullable: false
options:
unsigned: false
id: true
generator:
strategy: IDENTITY
fields:
left:
type: integer
nullable: false
options:
unsigned: false
gedmo:
- treeLeft
right:
type: integer
nullable: false
options:
unsigned: false
gedmo:
- treeRight
rootProductTreeID:
type: integer
nullable: false
options:
unsigned: false
gedmo:
- treeRoot
level:
type: integer
gedmo:
- treeLevel
manyToOne:
# parent:
# targetEntity: OS\Domain\Entity\Products\ProductComponent
# inversedBy: children
# joinColumn:
# name: parentProductComponentID
# referencedColumnName: id
# onDelete: CASCADE
# gedmo:
# - treeParent
root:
targetEntity: OS\Domain\Entity\Products\ProductTree
cascade: { }
fetch: LAZY
mappedBy: null
inversedBy: null
joinColumns:
rootProductTreeID:
referencedColumnName: id
orphanRemoval: false
gedmo:
- treeParent
component:
targetEntity: OS\Domain\Entity\Products\ProductComponent
cascade: { }
fetch: LAZY
mappedBy: null
inversedBy: null
joinColumns:
componentProductComponentID:
referencedColumnName: id
orphanRemoval: false
oneToMany:
children:
targetEntity: OS\Domain\Entity\Products\ProductComponent
mappedBy: parent
orderBy:
left: ASC
lifecycleCallbacks: { }
Our configuration of Doctrine adds in the Tree Driver:
$metadataDriver = new MappingDriverChain();
$configuredDriver = $this->createMetadataDriver($doctrineConfig, $metadataConfig);
$treeDriver = $doctrineConfig->newDefaultAnnotationDriver(
'/vendor/gedmo/doctrine-extensions/lib/Gedmo/Tree/Entity'
);
$metadataDriver->addDriver($configuredDriver,'OS');
$metadataDriver->addDriver($treeDriver,'Gedmo');
DoctrineExtensions::registerAbstractMappingIntoDriverChainORM($metadataDriver);
and we register the tree listener before creating the Doctrine Entity Manager:
$eventManager->addEventSubscriber(new TreeListener());
return EntityManager::create(config('doctrine.connection'), $doctrineConfig, $eventManager);
We've been trying for hours to get this thing wired up, but it always fails on persistence and we can't find why. We've code traced through all the different elements, but we can't see where we are getting this error from. Any help would be much appreciated, or a sample of how we can wire up the Tree using YAML would also be welcome.

Answer 1

We found that in the Tree mapping file, we had to name the left: and right: columns as lft: and rgt:, identically to the examples on the github repository for the yaml mappings.
fields:
lft: <----
type: integer
nullable: false
options:
unsigned: false
gedmo:
- treeLeft
rgt: <-----
type: integer
nullable: false
options:
unsigned: false
gedmo:
- treeRight