whatsapp_web_groups/models/ww_group_contact_rel.py

from odoo import models, fields

class WWGroupContactRel(models.Model):
    _name = 'ww.group_contact_rel'
    _description = 'Relación Contacto-Grupo de WhatsApp Web'
    _table = 'ww_group_contact_rel'

    # Explicitly define 'id' field. models.Model does this automatically,
    # but being explicit can sometimes help clarify intent or resolve
    # obscure schema generation issues if the table had a troubled history.
    # fields.Id() is the standard way to define Odoo's automatic ID.
    # id = fields.Id(string='ID')

    group_id = fields.Many2one('ww.group', string='Grupo', required=True, ondelete='cascade', index=True)
    contact_id = fields.Many2one('res.partner', string='Contacto', required=True, ondelete='cascade', index=True)
    is_admin = fields.Boolean(string='Administrador del Grupo', default=False)
    is_super_admin = fields.Boolean(string='Super Administrador del Grupo', default=False)
    role_id = fields.Many2one('ww.role', string='Rol en el Grupo') 

    _sql_constraints = [
        ('group_contact_uniq', 'unique(group_id, contact_id)', 'El contacto debe ser único por grupo.')
    ]