Table join with entity (Symfony) - php

Question

I'm new to Symfony and am having trouble getting my entities set up. I want to be able to access the tag names from my Acasset entity.
Here are the relevant entities:
class Actag
{
/**
* #var string
*
* #ORM\Column(name="tag_name", type="string", length=200, nullable=true)
*/
private $tagName;
/**
* #var integer
*
* #ORM\Column(name="tag_id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $tagId;
/**
* Acassettag
*
* #ORM\Table(name="acAssetTag", indexes={#ORM\Index(name="IDX_7C4A2A745DA1941", columns={"asset_id"}), #ORM\Index(name="IDX_7C4A2A74BAD26311", columns={"tag_id"})})
* #ORM\Entity
*/
class Acassettag
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #var \AdminBundle\Entity\Acasset
*
* #ORM\ManyToOne(targetEntity="AdminBundle\Entity\Acasset", inversedBy="asset", cascade="PERSIST")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="asset_id", referencedColumnName="asset_id")
* })
*/
private $asset;
/**
* #var \AdminBundle\Entity\Actag
*
* #ORM\ManyToOne(targetEntity="AdminBundle\Entity\Actag")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="tag_id", referencedColumnName="tag_id")
* })
*/
private $tag;
/**
* Acasset
*
* #ORM\Table(name="acAsset", indexes={#ORM\Index(name="IDX_3B81679E68BA92E1", columns={"asset_type"}), #ORM\Index(name="IDX_3B81679E12469DE2", columns={"category_id"})})
* #ORM\Entity(repositoryClass="AdminBundle\Repository\AcAssetRepository")
*/
class Acasset
{
/**
* #var string
*
* #ORM\Column(name="asset_name", type="string", length=100, nullable=false)
*/
private $assetName;
/**
* #var integer
*
* #ORM\Column(name="asset_id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $assetId;
/**
* #var \AdminBundle\Entity\Acassettype
*
* #ORM\OneToOne(targetEntity="AdminBundle\Entity\Acassettype", mappedBy="asset", fetch="EAGER", cascade={"persist"})
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="asset_type_id", referencedColumnName="asset_type_id")
* })
*/
private $assetType;
/**
* #var \AdminBundle\Entity\Actag
*
* #ORM\ManyToOne(targetEntity="AdminBundle\Entity\Actag")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="tag_id", referencedColumnName="tag_id")
* })
*/
private $assetTags;
/**
* Set tag
*
* #param \AdminBundle\Entity\Actag $tag
*
* #return Acassettag
*/
public function setAssetTags(\AdminBundle\Entity\Actag $tag = null)
{
$this->tag = $tag;
return $this;
}
/**
* Get tag
*
* #return \AdminBundle\Entity\Actag
*/
public function getAssetTags()
{
return $this->tag;
}
So in my Acasset entity I have created $assetTags but I am getting an error: Invalid column name 'tag_id'.
But $tag in the Acasettag entity works, which is set up the same way. What am I missing, still struggling a little with this part of Symfony.
I didnt't include all the getters and setters in this post, just the one I created for this.

Answer 1

Why does your Actag-Entity hat also a tagId field? You don't need a defined Id-Column on the Owning-Side. You have to define a OneToMany.
Many Acassettag are owned by one Actag (because of the ManyToOne-Definition in Acassettag
So every Acassettag will need the field actag_id with the Id of the owning Actag which will be autogenerated by your ManyToOne-Definition
When you create a new Acassettag Entity and want to "connect" it with a existing Actag you need Acassettag
public setActag(Actag $actag)
{
$this->tag = $actag;
return $this;
}