具有多个表的学说OneToOne

Question

Im using doctrine 2 and zend framework 3. I got an entity "Project" with an OneToOne Relation to "projectdetails". ProjectDetails is split between multiple tables depending on a the Project field "type".

Is there an easy way to tell doctrine which table to use for the projectdetails depending on the type field Value?

Answer 1

You can define "OneToOne" associations for each of the projectdetails tables:

/**
 * @OneToOne(targetEntity="ProjectDetails1")
 * @JoinColumn(name="project_details_id", referencedColumnName="id")
 */
private $projectDetails1;

/**
 * @OneToOne(targetEntity="ProjectDetails2")
 * @JoinColumn(name="project_details_id", referencedColumnName="id")
 */
private $projectDetails2;

Add any more projectdetails tables. Then use a getter function to get the correct relation based on type:

function getProjectDetails() {
    if($this->type === 'type1') {
        return $this->projectDetails1;
    }
    elseif($this->type === 'type2') {
        return $this->projectDetails2;
    }
}

Update : In this case you cannot use doctrine console tool to generate your associations, as it will be impossible to set the foreign key on "project_details_id" to 2 different tables.

To solve this, the column project_details_id of integer type should be created with a migration or you can define a field in the Project entity:

/**
 * @ORM\Column(type="integer", nullable=true)
 */
private $projectDetailsId;

generate & run the migration. Finally replace the latter field with the above associations.