odoo 8 Count attachment and show in list view - odoo

Question

I have odoo 8. I want to count the attachment from ir_attachment and and show it in stock.production.lot. Here is my .py
class stock_production_lot(models.Model):
_inherit='stock.production.lot'
#api.multi
def get_attachment_info(self):
for lot in self:
so_line_ids = self.env['ir.attachment'].search([('res_id','=',lot.id)])
for pick in so_line_ids:
pick.count_attachment = 0
if pick.datas_fname:
pick.count_attachment = len(pick.datas_fname)
count_attachment = fields.Float(string='Total Attachment', compute='get_attachment_info')
and this the view
<field name="count_attachment" />
Thanks

Answer 1

It's difficult to answer, because the information in your question are a bit poor. But let me try to answer it in a general way with a general example how i would do it.
Let's say you want a count of all attachments of model stock.picking (Delivery Nots, Slips, Receipts, and so on).
So you need to add a computed field, which could be stored, but it's difficult to trigger a recalculation of this field, because attachments are related to records indirectly (no real foreign keys used in database).
class StockPicking(models.Model):
_inherit = 'stock.picking'
attachment_count = fields.Integer(compute="_compute_attachment_count")
#api.multi
def _compute_attachment_count(self):
for picking in self:
domain = [('res_id', '=', picking.id),
('res_model', '=', self._name)]
picking.attachment_count = self.search_count(domain)
And also add the new field to a view of model stock.picking.
Now let's pretend that you don't only want the attachments of the pickings but also of their move lines, too.
Just "count" them and add that count to the previous one:
#api.multi
def _compute_attachment_count(self):
for picking in self:
domain = [('res_id', '=', picking.id),
('res_model', '=', self._name)]
picking_count = self.search_count(domain)
if picking.move_lines:
domain_move = [('res_id', 'in', picking.move_lines.ids),
('res_model', '=', picking.move_lines._name)]
picking_count += picking.move_lines.search_count(domain_move)
picking.attachment_count = picking_count

Answer 2

Thank you for the respone. I have got the answer
#api.one
def count_attachments(self):
obj_attachment = self.env['ir.attachment']
for record in self:
record.count_attachment = 0
attachment_ids = obj_attachment.search([('res_model','=',self._name),('res_id','=',record.id)])
if attachment_ids:
record.count_attachment = len(attachment_ids)