Odoo 15 - compute fields only for records that change?

Question

Hi everyone, another question. I am trying to setup a compute field that depends on the first_name attribute of my Person model, and has the value "Hi, ". I was able to achieve it in the following way, by looping through the "self" recordset:
```
hello_msg = fields.Char(string="hello", compute='_test_hello')

@api.depends("first_name")
def
_test_hello(self):
for rec in self:
rec.hello_msg= 'Hi, ' + rec.name

```
However, it seems like any time I enter my list view, this field is recomputed for A

Cybrosys Techno Solutions Pvt.Ltd · Answer

Hi Fred,
hello_msg = fields.Char(string="hello", compute='_test_hello', store=True) update hello_msg field as storable, then compute function triggers only when the dependent field changes.
Regards

Fred Nunes · Answer

@Rinkal thanks for your reply. However, I've tried doing it and it still triggered every time I entered the list view.
A couple more questions:
* doesn't your example iterate through all records anyway? Is there a way to target the single record that changes, instead of iterating through the self recordset?
* what is the point of
compute='_test_hello' on my original example? If we are manually assigning the a value to rec.hello_msg inside the function, we could very well assign values to other a

Rinkal Aghera · Answer

Hello,
You can use onchange() method instead of the compute method.
@api.onchange("first_name")
def _test_hello_based_on_change(self):
for rec in self:
rec.hello_msg= ''
rec.hello_msg= 'Hi, ' + rec.name

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