I've created a graph view
<record model="ir.ui.view" id="view_order_line_graph">
<field name="name">sale.order.line.graph</field>
<field name="model">sale.order.line</field>
<field name="type">graph</field>
<field name="arch" type="xml">
<graph string="Sales Order Lines">
<field name="product_id" group="True"/>
<field name="price_unit" operator="*"/>
</graph>
</field>
</record>
I would like to view the graph but only with today data.