I cant get my head around how to access properties over 2 relationships with the neo4j-php-ogm library.
Say for example I have a "user" node, which connects to MANY "resource" nodes, which in return are each connected to a fixed number of predefined "MetaResource" node. The "resource" nodes have properties and the "MetaResource" nodes have the Meta-Properties of each resource type. How can I know access the properties of the "MetaResource" nodes starting from a "user" node? In Neo4j one such route looks like this:
(user)-[r:HAS_RESOURCE]->(resource)-[m:METARESOURCE]->(metaResource)
My example user entity:
/**
* @OGM\Node(label="User")
*/
class User
{
/**
* @OGM\GraphId()
* @var int
*/
private $id;
/**
* @OGM\Relationship(type="HAS_RESOURCE", direction="OUTGOING", targetEntity="\AppBundle\Entity\Resources", collection=true)
* @var ArrayCollection|\AppBundle\Entity\Resources[]
*/
protected $resources;
/**
* @return \Doctrine\Common\Collections\ArrayCollection|\AppBundle\Entity\Resources[]
*/
public function getResources()
{
return $this->resources;
}
/**
* @return \Doctrine\Common\Collections\ArrayCollection|\AppBundle\Entity\Resources[]
*/
public function getResource($name)
{
foreach($this->resources as $resource){
if($resource->getResourceType() == $name){
return $resource;
break;
}
}
}
/**
* @param AppBundle\Entity\Resources $resources
*/
public function addResource(Resources $resources)
{
if (!$this->resources->contains($resources)) {
$this->resources->add($resources);
}
}
}
My Example Resource Entity:
/**
* @OGM\Node(label="Resources")
*/
class Resources
{
/**
* @OGM\GraphId()
* @var int
*/
protected $id;
/**
* @OGM\Property(type="int")
* @var int
*/
protected $resourcecount;
/**
* @OGM\Relationship(type="METARESOURCE", direction="OUTGOING", targetEntity="\AppBundle\Entity\MetaResource", collection=false)
* @var MetaResource
*/
protected $metaResource;
/**
* @param \AppBundle\Entity\MetaResource $metaResource
*/
public function __construct(MetaResource $metaResource)
{
$this->metaResource = $metaResource;
}
public function getId()
{
return $this->id;
}
public function getResourceCount()
{
return $this->resourcecount;
}
public function setResourceCount($resourcecount)
{
$this->resourcecount = $resourcecount;
}
/**
* @return \AppBundle\Entity\MetaResource
*/
public function getMetaResource()
{
return $this->metaResource;
}
}
And my Example MetaResource Entity:
/**
* @OGM\Node(label="MetaResource")
*/
class MetaResource
{
/**
* @OGM\GraphId()
* @var int
*/
protected $id;
/**
* @OGM\Property(type="string")
* @var string
*/
protected $resourceType;
/**
* @OGM\Property(type="string")
* @var string
*/
protected $name_DE;
/**
* @OGM\Property(type="string")
* @var string
*/
protected $icon;
/**
* @OGM\Property(type="string")
* @var string
*/
protected $iconColour;
/**
* @OGM\Property(type="string")
* @var string
*/
protected $colour;
public function getResourceType()
{
return $this->resourceType;
}
public function getName_DE()
{
return $this->name_DE;
}
public function getIcon()
{
return $this->icon;
}
public function getIconColour()
{
return $this->iconColour;
}
public function getColour()
{
return $this->colour;
}
}
And finally the code from my controller, which sets up the relations:
$metaResource=$em->getRepository(MetaResource::class)->findOneBy('resourceType', 'wood');
$rWood = new Resources($metaResource);
$rWood->setResourceCount(20);
$em->persist($rWood);
$em->flush();
$user->addResource($rWood);
If I now have a look at the Neo4j webconsole, all relationships and nodes are correctly inserted.
Now, if I get the resources of a user with $user->getResources() I successfully get all the resource objects, but the "$metaResource" property is always NULL instead of the anticipated Object of my MetaResource entity. For example if I do:
foreach($user->getResources() as $resource){
var_dump($resource->getMetaResource());
}
Then it outputs only NULLs.
On the other hand, if I directly get a resource object (for example with $resource = $em->getRepository(Resources::class)->findOneById(123) ) and then try to get the connected MetaResource with $resource->getMetaResource() it works. What am I missing?
Cheers
