Hello I want to create a button to publish job offers on web site 

Error : AttributeError: type object 'recrutement.offre_d_emploi' has no attribute 'open_website_url'

this is ma code :

class Offre_D_emploi(models.Model):
    _name = "recrutement.offre_d_emploi"
    _rec_name = "reference"

    reference = fields.Integer(string="Référence")
    titre_poste = fields.Char(String="Titre de poste")
    nom_societé = fields.Char(String="Nom de la societé")
    localité = fields.Char(String="Localité")
    parent_id = fields.Many2one('hr.department', string="Departement")
    description_poste = fields.Text(String="Description Poste")
    exigences = fields.Char(String="Exigences")
    date_debut = fields.Date(string="Date Début")
    avantages = fields.Char(string="Avantages")
    date_fin_d_offre = fields.Date(string="Date fin d'offre")
    website_published = fields.Boolean('Visible on current website', related='is_published', readonly=False)
    is_published = fields.Boolean('Is Published', copy=False, default=lambda self: self._default_is_published())
    can_publish = fields.Boolean('Can Publish', compute='_compute_can_publish')
    website_url = fields.Char('Website URL', compute='_compute_website_url', help='The full URL to access the document through the website.')

    def _compute_website_url(self):
        for job in self:
            job.website_url = "/jobs/detail/%s" % job.id

    def set_open(self):
        self.write({'website_published': False})
        return self.website_url

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<record id="offre_form" model="ir.ui.view">
    <field name="name">recrutement.offre_d_emploi.form</field>
    <field name="model">recrutement.offre_d_emploi</field>
    <field name="arch" type="xml">
        <form string="Offres d'emploi">
            <sheet>
                <h1>  Publication d'offre d'emploi :
                </h1>
                <div name="button_box" position="inside">
                     <field name="is_published" widget="website_redirect_button"/>
                </div>
                     <group>
                         <field name="reference"/>
                         <field name="titre_poste"/>
                     </group>
                     <group>
                        <field name="nom_societé"/>
                        <field name="localité"/>
                     </group>
                     <group>
                         <field name="parent_id"/>
                         <field name="description_poste"/>
                     </group>
                     <group>
                        <field name="exigences"/>
                         <field name="date_debut"/>
                         <field name="avantages"/>
                         <field name="date_fin_d_offre"/>
                     </group>
            </sheet>
        </form>
    </field>
</record>