GOLEM/golem_family_membership/views/golem_family_views.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
Copyright 2018 Youssef El Ouahby <youssef@yaltik.com>
Copyright 2018 Fabien Bourgeois <fabien@yaltik.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
-->

<odoo>
  <data>
    <!-- Forms -->
    <record model="ir.ui.view" id="golem_family_form_inherit_golem_family">
      <field name="name">Golem Family form adaptations</field>
      <field name="model">golem.family</field>
      <field name="inherit_id" ref="golem_family.golem_family_form" />
      <field name="arch" type="xml">
        <sheet position="before">
          <header>
            <button name="family_membership" type="object"
              string="Family membership" class="oe_highlight"
              attrs="{'invisible': ['|', ('id', '=', False), ('member_ids', '=', [])]}" />
            <field name="id" invisible="1"/>
            <field name="member_ids" invisible="1"/>
          </header>
        </sheet>
      </field>
    </record>
  </data>
</odoo>