how do I display the values, I have a field that loads the model, but I don’t know how to get the data from this model to the tree, I can get any data from the model, but how can I get the data from this model to the tree. Help please, who than can

        <record id="view_order_form_without_customer" model="ir.ui.view">

            <field name="name">sale.order.form.appointment</field>

            <field name="model">sale.order</field>

            <field name="inherit_id" ref="sale.view_order_form"/>

            <field name="arch" type="xml">

            <xpath expr="//page/field[@name='order_line']/.." position="before">

                <page string="List appointment">

                    <field name="recapp">

                        <tree string="appointments">

                            <field name="date"/>

                            <field name="description" />

                        </tree>

                    </field>

                </page>

            </xpath>

            </field>

        </record>

class SaleAppointment(models.Model):

_inherit='sale.order'

recapp = fields.One2many('record.appointment', 'example')   

class RecordAppointment(models.Model):

_inherit='record.appointment'

example = fields.Many2one('sale.arder', ondelete='cascade')