Odoo - calculation on add or edit of one2many field - odoo

Question

I have customer and deposit field in customer form which is one2many actually but user add a line in deposit and submit or edit some existing. I want to do some calculations on that event . I tried onchange and compute both but its not working.

Answer 1

add or edit One2many fields is FormView.
so you just put the field what you what to do calculate in FormView *.xml
Ex. with my SUM fields
<record model="ir.ui.view" id="view_nstda_bst_dbill_form">
<field name="name">nstda.bst.dbill.form</field>
<field name="model">nstda.bst.dbill</field>
<field name="type">form</field>
<field name="arch" type="xml">
<form string="nstda_bst_dbill" class="nstda_bst_dbill_form" >
<group>
<field name="status" invisible="1" />
<field name="matno" />
<!-- <field name="matdesc" /> -->
<label for="balance" />
<div>
<field name="balance" style="width: 20%%" />
<field name="uom_1" style="width: 10%%;"
attrs="{'invisible':[('matno','=',False)]}" />
</div>
<label for="balance_rs" />
<div>
<field name="balance_rs" style="color:Red;width: 20%%" />
<field name="uom_2" style="width: 10%%;"
attrs="{'invisible':[('matno','=',False)]}" />
</div>
<label for="qty" />
<div>
<field name="qty" style="width: 20%%"
attrs="{'required':[('status','in',['draft','edit',False])]}" />
<field name="uom" style="width: 10%%;"
attrs="{'invisible':[('matno','=',False)]}" />
</div>
<!-- <field name="unitprice" /> -->
<label for="unitprice" />
<div>
<field name="unitprice" style="width: 20%%" />
<field name="currency" style="width: 10%%;" />
</div>
<field name="sum" invisible="1" />
<field name="dbill_discount_sum" invisible="1" />
</group>
</form>
</field>
</record>
and the *.py side is...
Ex.
#api.one
#api.onchange('qty','matno')
#api.depends('qty','matno')
def _set_sum(self):
self.sum = self.unitprice * self.qty
sum = fields.Float(string="summary", store=True, compute='_set_sum')
matno = fields.Many2one('bst.stock', 'matno')
qty = fields.Integer('qty')