flectra/addons/digest/wizard/digest_custom_fields_view.xml

<?xml version="1.0"?>
<flectra>
    <record id="digest_custom_fields_view_form" model="ir.ui.view">
        <field name="name">digest.custom.fields.form</field>
        <field name="model">digest.custom.fields</field>
        <field name="arch" type="xml">
            <form string="Customized Digest">
                <group col="4">
                    <field name="field_name"/>
                    <field name="label_name"/>
                    <field name="available_group_name" required="1"/>
                    <field name="position" required="1"/>
                    <field name="new_group_name" attrs="{'required': [('position', '!=', 'inside')], 'invisible': [('position', 'not in', ['before', 'after'])]}"/>
                </group>
                <group>
                    <label for="model_id"/>
                    <div>
                        <field name="model_id" options="{'no_create': True}" required="1"/>
                        <field name="model_name" invisible="1"/>
                        <field name="model_real" invisible="1"/>
                        <field name="model_domain" widget="domain"
                            options="{'model': 'model_real'}"/>
                    </div>
                </group>
                <group>
                    <field name="related_date_field_id" options="{'no_create': True}" domain="[('model', '=', model_real), ('ttype', 'in', ['date', 'datetime'])]" required="1"/>
                </group>
                <notebook>
                    <page string="Compute Details">
                        <group>
                            <field name="compute_field_name"/>
                            <field name="ttype"/>
                            <field name="compute" widget="ace" options="{'mode': 'python'}"/>
                        </group>
                    </page>
                    <page string="Help">
                        <h3>How to define a computed field</h3>
                        <div class="alert alert-info" role="alert">
                            The field <code>Compute</code> is the Python code to compute the value of the field on a set of records.
                            The value of the field must be assigned to each record with a dictionary-like assignment.
                            <pre>
for record in self:
    record['size'] = len(record.name)</pre>
                        </div>
                    </page>
                </notebook>
                <footer>
                    <button name="action_add_customize_digest" string="Save" type="object" class="btn btn-sm btn-primary"/>
                    <button string="Cancel" class="btn btn-sm btn-default" special="cancel"/>
                </footer>
            </form>
        </field>
    </record>

    <record id="digest_custom_fields_action" model="ir.actions.act_window">
        <field name="name">Customized Digest</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">digest.custom.fields</field>
        <field name="view_mode">form</field>
        <field name="view_id" ref="digest_custom_fields_view_form"/>
        <field name="target">new</field>
    </record>
</flectra>