How to write create and write function for the onchange in ver 11

Question

I have an onchange method describe in the model and based on that values i want to store values in the read-only fields, its happen buts while saving its gone.
######################################
@api.onchange('product_id')
def onchange_product_id(self):
cr = self.env.cr
desc = ''
uom = -1
for rec in self:
cr.execute('''SELECT
product_uom.id AS uom,
product_template.name AS desc,
product_hsn_tax_code.hsn_name AS hsn_code,
product_hsn_tax_code.tax_percentage AS gst_value
FROM
product_uom JOIN

Hilar Andikkadavath · Accepted Answer

*onchange* method doesn't store the read-only field values on the *database*.To do so you have to update the values dict of *create and write* methods. So better option is to store value inside the fields dict before the actual create method invokes.
*override create and write function *and do the same operation or store the value on the read-only field.

Sehrish · Answer

You can do this using overriding create and write method of odoo. Here the question is why we need to override these (create, write and unlink) methods.
The answer is to add or remove additional functionality we use overriding. For example if I want to check some constraints before creating, editing or deleting our record than we may use Odoo override methods.
*There are basically three methods which we can override.*
Create
Write
Unlink

To complete code and code description read: http://learno

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