YouFood\MainBundle\Entity\Week:
    xml_root_name: week
    properties:
        id:
            groups: [id]
        year:
            groups: [week_list, week_detail]
        weekNumber:
            groups: [week_list, week_detail]
        themes:
            groups: [week_list, week_detail]

YouFood\MainBundle\Entity\Week:
    xml_root_name: week
    properties:
        id:
            groups: [id]
        year:
            groups: [week_list, week_detail]
        weekNumber:
            groups: [week_list, week_detail]
        theme:
            groups: [week_list, week_detail]

Fix serializer definition that was incorrect
Fix serializer definition that was incorrect
