Why does doctrine 2 (postgresql) fail to execute DEFAULT NULL when migrating?

Question

PostgreSQL

Basically there is a column

/**
     * @ORM\Column(type="string", nullable=true, options={"default": "slug"})
     */
    protected $slug = null;

By executing php app/console doctrine:migrations:diff
in up the update line is:

ALTER TABLE blog ADD slug VARCHAR(255) DEFAULT NULL

But when I do php app/console doctrine:migrations:migrateI get

[PDOException]                                                                     
  SQLSTATE[23502]: Not null violation: 7 ERROR:  column "slug" contains null values

Please tell me why. Thank you.

Answer 1

You're putting a constraint on a column that doesn't traverse it. i.e. you already have null values ​​in "slug". You need to change them to something else and try again.