Autofill some fields Openerp - odoo

Question

Hi I am new to OpenERP7/Odoo7 and not really getting how to do this.
I have a existing records in my custom product module and I want to retrieve that record by entering only to my prodcode fields and want to autofill some fields.
I have been reading a lot on the internet, Odoo forums, but cannot find the answer or I just don't understand it. I already have post with regards to my problem
So if is there someone could give me an answer on how to achieve this, or direct me to a easy to understand explanation.
That would be great.
Here is I have done already
PYTHON---
class test_product(osv.Model):
_name = "test.product"
def name_change(self, cr, uid, ids, test_prodcode_id, prodname, desc, price, context=None):
return {
'value': {
'prodname': 'Plastic Ware',
'desc': 'Affordable Plastic Ware',
'price': 100.00,
}
}
_columns = {
'test_prodcode_id': fields.many2one('test.prodcode', 'Code'),
'prodname': fields.char('Name', size=32),
'desc': fields.char('Description', size=32),
'price': fields.float('Price',),
}
class test_prodcode(osv.Model):
_name = "test.prodcode"
_columns = {
'name': fields.char('Product Code', size=32),
}
XML----
<record id="test_product_form_view" model="ir.ui.view">
<field name="name">test.product.form.vew</field>
<field name="model">test.product</field>
<field name="type">form</field>
<field name="arch" type="xml">
<form string="Product" version="7.0">
<sheet>
<field name="test_prodcode_id" on_change="name_change(test_prodcode_id,prodname,desc,price)"/>
<field name="prodname"/>
<field name="desc"/>
<field name="price"/>
</sheet>
</form>
</field>
</record>

Answer 1

Yeah, I've had this problem too.
I've got the solution. Auto fill can be achieved by doing
_defaults = {}
, or, as in your example, by doing
class test_product(osv.Model):
_columns = {
'test_prodcode_id': fields.many2one('test.prodcode', 'Code'),
'prodname': fields.char('Name', size=32),
'desc': fields.char('Description', size=32),
'price': fields.float('Price',),
}
_defaults: {
'test_prodcode_id' : 'defaults_prodcode',
}
You can also assign a function that return the value of the defaults.

Answer 2

I have solution but it is not as exactly as you want but you can do like
this also.
You can use related for auto fill your other fields. Suppose you set
product_id it will auto fill product_name, desc and price regarding to
your product_id.
You can also see Example here :
https://stackoverflow.com/a/42453539/5161074