res_partner_views.xml

<?xml version="1.0"?>
<!-- Copyright 2020 Le Filament
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->

<odoo>
    <data>
    
        <record id="act_res_partner_2_project" model="ir.actions.act_window">
            <field name="name">Projets</field>
            <field name="res_model">project.project</field>
            <field name="view_type">form</field>
            <field name="view_mode">tree,form</field>
            <field name="context">{'search_default_partner_id': active_id}</field>
            <field name="help" type="html">
              <p class="o_view_nocontent_smiling_face">
                Créer un nouveau projet
              </p>
            </field>
        </record>

        <record id="view_partner_form" model="ir.ui.view">
            <field name="name">view.partner.form.inherit</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="arch" type="xml">
                <button name="toggle_active" position="before">
                    <button class="oe_stat_button" type="action" name="%(adefpat_project.act_res_partner_2_project)d" 
                        icon="fa-file-o">
                        <field string="Projets" name="project_count" widget="statinfo"/>
                    </button>
                </button>
            </field>
        </record>
    </data>
</odoo>