Hi, 

I want to put many values on my selection form.

Is it possible ? 

models.py:

from odoo import models, fields, api

class MonHelpdeskTicket(models.Model):
    """Champs qui compose le modele d'une offres. Ce sont principalement les champs à compléter dans le formulaire"""

    _name = "monmarchepublic"
    _inherit = 'res.users'
    _inherit = [
        'mail.thread',
        'ir.needaction_mixin',
    ]
    x_name = fields.Char('Nom et Prenom', readonly=0, website_form_blacklisted=0, Store=True )
    x_objet_consultation = fields.Char('Objet de la consultation', readonly=0, website_form_blacklisted=0, Store=True)
    x_membre_interne = fields.Char("Membres de l'équipe INTERNE", readonly=0, website_form_blacklisted=0, Store=True)
    x_membre_externe = fields.Char(" Membres de l'équipe EXTERNE et/ou informations utiles", readonly=0, website_form_blacklisted=0, Store=True)
    x_equipeok = fields.Boolean('Equipe complète', readonly=0, website_form_blacklisted=0, Store=True)
    x_admin = fields.Char('Administration', readonly=0, website_form_blacklisted=0, Store=True)
    x_inputstreet1 = fields.Char('N° et Rue', readonly=0, website_form_blacklisted=0, Store=True)
    x_inputcity1 = fields.Char('Ville', readonly=0, website_form_blacklisted=0, Store=True)
    x_inputzip1 = fields.Integer('Code Postal', readonly=0, website_form_blacklisted=0, Store=True)
    x_date_order = fields.Date('Date de publication', readonly=0, website_form_blacklisted=0, Store=True)
    x_type_marche = fields.Selection([("offre_ferme", "Appel d'offre Fermé"), ('offre_ouvert', "Appel d'offre Ouvert"), ('concours', 'Concours'), ('consultation', 'Consultation'), ('mapa', 'MAPA')], readonly=0, website_form_blacklisted=0, Store=True)
    x_date_limite = fields.Datetime('Date et heure limites de dépot de candidature', readonly=0, website_form_blacklisted=0, Store=True)
    x_duree_marche = fields.Char('Durée du marché', readonly=0, website_form_blacklisted=0, Store=True)
    x_montant_marche = fields.Integer('Montant du marché', readonly=0, website_form_blacklisted=0, Store=True)
    x_inputstreet2 = fields.Char('N° et Rue', readonly=0, website_form_blacklisted=0, Store=True)
    x_inputcity2 = fields.Char('Ville', readonly=0, website_form_blacklisted=0, Store=True)
    x_inputzip2 = fields.Integer('Code Postal', readonly=0, website_form_blacklisted=0, Store=True)
    x_num_ref = fields.Char('Numéro de référence attribué au marché', readonly=0, website_form_blacklisted=0, Store=True)
    x_cat = fields.Selection([("Etudes, Maitrise d oeuvre, Controle", "Etudes, Maîtrise d'oeuvre, Contrôle"), ('Travaux de batiment', 'Travaux de bâtiment'), ('Travaux Publics', 'Travaux Publics'), ('Fournitures', 'Fournitures'), ('Services', 'Services')], readonly=0, website_form_blacklisted=0, Store=True)
    x_pj = fields.Binary('Pièce Jointe', readonly=0, website_form_blacklisted=0, Store=True)
    x_ville_adju = fields.Char('Ville du Pouvoir Adjudicateur', readonly=0, website_form_blacklisted=0, Store=True)
    x_mail = fields.Char('Email', readonly=0, website_form_blacklisted=0, Store=True)
    x_etape = fields.Selection([('New', 'New'), ('CCTP', 'CCTP'), ('En cours de traitement', 'En cours de traitement'), ('Valide', 'Validé'), ('Refuse', 'Refusé'), ('Archive', 'Archivé')], readonly=0, website_form_blacklisted=0, Store=True)
    message_ids = fields.One2many('mail.message',  'res_id', string="Commentaire", Store=True)
    partner_ids = fields.Many2many('res.partner', string='Recipients', help="List of partners that will be added as follower of the current document.", readonly=0, website_form_blacklisted=0, Store=True)
    message_partner_ids = fields.Many2many(
        comodel_name='res.partner', string='Followers Test',
        compute='_get_followers', search='_search_follower_partners', readonly=0, website_form_blacklisted=0, Store=True)
    follower_ids = fields.One2many('mail.followers',  'res_id', string="follo", readonly=0, website_form_blacklisted=0, Store=True)
    x_etiquettes = fields.Many2many('res.user', string="many2many_tags",readonly=0, website_form_blacklisted=0, Store=True)

template.xml:

 <div class="col-md-7 col-sm-8 ">
    <select id="membre_interne" name="x_etiquettes"  widget='many2many_tags' class="form-control " >
       <option value="" >Sélectionnez...</option>
       <t t-foreach="users" t-as="user" >

       <option t-att-name="x_membre_interne"  t-att-value="user.login"   >
         <t t-esc="user.login" widget="many2many_tags"/>
       </option>
       </t>
     </select>
 </div>

Thanks, regards