I am using odoo 8. I want to send auto mail (without popping up any window) after "Confirm Order" button pressed in saved Request for Quotation(RfQ).

I have created new module which extends 'purchase.order'

class purchase_confirm(osv.osv):

_inherit = 'purchase.order'

def wkf_confirm_order(self, cr, uid, ids, context=None):

ctx = dict(context)

ctx.update({

'lang': 'en_US',

'tz': 'Asia/Dhaka',

'uid': uid,

'send_rfq': False,

'default_model': 'purchase.order',

'active_model': 'purchase.order',

'default_res_id': ids[0],

'default_use_template': bool(template_id),

'default_template_id': template_id,

'default_composition_mode': 'comment',

})

self.pool.get('mail_compose_message').send_mail(cr, uid, ids, context=ctx)

return True

But it is showing following error when I press the "Confirm Order" button:

ValueError: "'NoneType' object has no attribute 'send_mail'" while evaluating

u'wkf_confirm_order()'