Py File

class DailyLog(models.Model):
	_name = "daily.log"
	_inherit = "mail.thread"
	_order = "id desc"
	@api.multi
	def _current_user_get_fnc(self):
		self.current_user = self.env.user.id
        user_id = fields.Many2one('res.users', 'Assign to', track_visibility='onchange', default=lambda self: self.env.user, index=True)
	current_user = fields.Many2one('res.users', 'Current User', compute='_current_user_get_fnc', store=False)

View file

<record id="daily_log_form_view" model="ir.ui.view">
            <field name="name">daily.log.form</field>
            <field name="model">daily.log</field>
            <field name="arch" type="xml">
                <form string="Daily Log">
                    <sheet>
                        <group>
                            <group>
                                <field name="user_id" options='{"no_create": True}' context="{'user_preference': 1}"/>
                            </group>
                            <group>
                                <field name="current_user"/>
                            </group>
                        </group>
                    </sheet>
                </form>
            </field>
        </record>

<record id="daily_log_form_view_inherited" model="ir.ui.view">
            <field name="name">daily.log.form.inherited</field>
            <field name="model">daily.log</field>
            <field name="inherit_id" ref="crm_debranding.daily_log_form_view"/>
            <field name="groups_id" eval="[(6,0, [ref('crm_base_debranding.group_telesales')])]" />   
            <field name="arch" type="xml">
                <xpath expr="//form/sheet//field[@name='name']" position="attributes">
                    <attribute name="attrs">{'readonly': [('user_id', '!=', create_uid)]}</attribute>
                </xpath>
            </field>
        </record>