reports.xml

<odoo>
<data>
    <report
        id="report_session"
        model="openacademy.session"
        string="Session Report"
        name="openacademy.report_session_view"
        file="openacademy.report_session"
        report_type="qweb-pdf" />

    <template id="report_session_view">
        <t t-call="report.html_container">
            <t t-foreach="docs" t-as="doc">
                <t t-call="report.external_layout">
                    <div class="page">
                        <h2 t-field="doc.name"/>
                        <p>From <span t-field="doc.start_date"/> to <span t-field="doc.end_date"/></p>
                        <h3>Attendees:</h3>
                        <ul>
                            <t t-foreach="doc.attendee_ids" t-as="attendee">
                                <li><span t-field="attendee.name"/></li>
                            </t>
                        </ul>
                    </div>
                </t>
            </t>
        </t>
    </template>
</data>
</odoo>