How to store default entered value in custom field of quantity on Hand.? - odoo

Question

Need to store default value on qty in M.sqr and square meter like quantity on hand showing default entered value.
when i click on update button of quantity on Hand from product inventory page
then it should show me a previous entered value.
class stock_change_product_qty(osv.osv):
_inherit = 'stock.change.product.qty'
_columns = {
'new_quantity' : fields.float('Qty in Boxes'),
'squ_meter': fields.related('product_id','squ_meter', type='float', relation='product.product', string='Square Meter'),
'qty_char': fields.float('Qty in M.sqr', compute='_compute_qty_char'),
}
#api.depends('new_quantity', 'squ_meter')
def _compute_qty_char(self):
for record in self:
record.qty_char = record.new_quantity * record.squ_meter
view.xml
<field name="name">update_product_quantity inherit</field>
<field name="model">stock.change.product.qty</field>
<field name="inherit_id" ref="stock.view_change_product_quantity"/>
<field name="arch" type="xml">
<xpath expr="//field[#name='new_quantity']" position="attributes">
<attribute name="string">Qty in Boxes</attribute>
</xpath>
<xpath expr="//field[#name='new_quantity']" position="replace">
<field name="new_quantity"/>
<field name="squ_meter"/>
<field name="qty_char"/>
</xpath>
</field>
</record>

Answer 1

A solution is to use a function as default value for your field:
odoo V8
from openerp import api, fields, models
class stock_change_product_qty(models.Model):
_inherit = 'stock.change.product.qty'
new_quantity = fields.Float(string='Qty in Boxes', default=1.0),
squ_meter = fields.Float(related='product_id.squ_meter', string='Square Meter', default=1.0),
qty_char = fields.Float('Qty in M.sqr', compute='_compute_qty_char'),
}
#api.one
#api.depends('new_quantity', 'squ_meter')
def _compute_qty_char(self):
for record in self:
record.qty_char = record.new_quantity * record.squ_meter
odoo V7
def _your_function(self, cr, uid, context=None):
your code here
...
...
...
return field_value
_defaults = {
'your_field' : _your_function,
}
#api.onchange
This decorator will trigger the call to the decorated function if any of the fields specified in the decorator is changed in the form:
#api.onchange('fieldx')
def do_stuff(self):
if self.fieldx == x:
self.fieldy = 'toto'
In previous sample self corresponds to the record currently edited on the form. When in on_change context all work is done in the cache. So you can alter RecordSet inside your function without being worried about altering database. That’s the main difference with #api.depends
At function return, differences between the cache and the RecordSet will be returned to the form.