If a particular field output value will negative so that how can i set it to 0 when view the XML file in Odoo?

Question

I am trying to calculate the difference value between the two fields in ORM. If the result value is negative it will the value 0 when I show this field value using XML.

excess_amount = fields.Float(string="Excess amount", compute='difference_excess_amount')
  
def difference_excess_amount(self):
    for rec in self:
        rec.excess_amount = rec.actual_total - rec.expected_total

<field name="excess_amount"/>

Answer 1

Please try below code

@api.depends('actual_total', 'expected_total')
def difference_excess_amount(self):
    for rec in self:
        excess_amount = rec.actual_total - rec.expected_total
        rec.excess_amount = 0 if excess_amount < 0 else excess_amount

Answer 2

@api.depends('actual_total', 'expected_total')
def difference_excess_amount(self):
    for rec in self:
        rec.excess_amount = rec.actual_total - rec.expected_total
        if rec.excess_amount < 0:
            rec.excess_amount = 0

This should work.