Symfony＆Doctrine2：“ mappedBy”注释的值？

Question

I am learning Symfony 3 with Doctrine 2.

When I have OneToMany relationship in Doctrine entity, what exactly I have to put into mappedBy annotation?

• Is it the table name of current entity?
• Or is it the entity shortcut ?
• Or is it the actual class name?

Imagine this simple example:

<?php
namespace AppBundle\Entity;

/**
 * @ORM\Entity
 * @ORM\Table(name="blog_category")
 */
class Category
{
    // ...

    /**
     * @ORM\OneToMany(targetEntity="Article", mappedBy="category")
     */
    private $articles;

    // ...

}

Why is the "category" correct value for mappedBy ? Why isn't it "blog_category" or "Category" (uppercase "C")? Or "AppBundle:Category" ?

Answer 1

Now I figured it out. It is the name of related's entity class variable :-)

Answer 2

To give a complement, almost everything you could do in doctrine (could surely be applied for any other ORM/ODM), in almost every contexts (QueryBuilder, findBy methods, ...) you'll use property names rather than column names.

The reason is quite simple, an ORM deals with objects and their properties, abstracting the real tables and their columns, no matter of the database engine or anything else.