Issue.php

<?php

namespace AppBundle\Entity;

class Issue
{
    /**
     * @var string
     *
     * @ORM\Id
     * @ORM\Column(type="string")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(type="string", length=255)
     * @Assert\NotBlank()
     */
    private $title;

    /**
     * @var string
     *
     * @ORM\Column(type="string", nullable=true)
     */
    private $content;

    /**
     * @var string
     *
     * @ORM\Column(type="string", length=255)
     */
    private $state;

    /**
     * @var \DateTime
     *
     * @ORM\Column(type="datetime")
     * @Assert\DateTime()
     */
    private $createdAt;

    // ...
}

workflow.yaml

framework:
    workflows:
        issue:
            marking_store:
                type: single_state
                arguments:
                    - state
            supports: AppBundle\Entity\Issue
            initial_place: opened
            places:
                - opened # créée
                - affected # affectée à un utilisateur
                - in_progress # en cours de traitement
                - completed # terminée
                - closed # clôturée
            transitions:
                affect:
                    from: opened
                    to: affected
                treat:
                    from: affected
                    to: in_progress
                complete:
                    from: in_progress
                    to: completed
                close:
                    from: completed
                    to: closed