How to change the default value of a property field in Odoo (old API)? - odoo

Question

I'm trying to change the default value of some property fields such as: 'cost_method', 'product_type' and 'valuation' of the 'product' module but I can only change the non-property fields only.
What I tried:
- I created a new module and inherited the 'product.template' model and overridden the '_default' dictionary only but it didn't work.
I created new fields with the same name but of another type (selection) not property but neither did this work.
The code:
_name = "product.template"
_inherit = "product.template"
_columns = {
'cost_method': fields.selection([('average', 'Average Price'),('standard', 'Standard Price'), ('real', 'Real Price')])
,'type': fields.selection([('product', 'Stockable Product'),('consu', 'Consumable'),('service','Service')], 'Product Type', required=True, help="Consumable are product where you don't manage stock, a service is a non-material product provided by a company or an individual.")
,'company_id': fields.many2one('res.company', 'Company', required=False)
}
_defaults = {
'company_id': False
,'type' : 'product'
, 'cost_method': 'average'
, 'barcode':'555'
}

Answer 1

Use only _inherit="product.template". In your case you don't need the _name property.
Did you add your py. File to your __init__.py?
Did you set the correct dependencies in your __openerp__.py. In your case "product"?
Hope that helps you. Let me know.
EDIT:
I could reproduce your problem. My Code for testing
# -*- coding: utf-8 -*-
from openerp.osv import osv, fields
class product_template(osv.osv):
_name = "product.template"
_inherit = "product.template"
_columns = {
'cost_method': fields.selection([('average', 'Average Price'),('standard', 'Standard Price'),('real', 'Real Price')]),
'type': fields.selection([('product', 'Stockable Product'),('consu', 'Consumable'),('service','Service')],'Product Type', required=True, help="Consumable are product where you don't manage stock, a service is a non-material product provided by a company or an individual.") ,
'company_id': fields.many2one('res.company', 'Company', required=False)
}
_defaults = {
'company_id': False,
'type' : 'consu',
'cost_method': 'average',
'barcode':'555'
}
Here the type-field never had the consu value. In my case I could solve the problem by opening the menu Settings -> Technical Settings -> Actions -> User-defined Defaults. I deleted all entries where the name is type and modelname is product.template.
Now if I create a new product the default type is consu. Same behaviour with cost_method-field.