If i want to open duplicate sale order on other other model, then what should i do?

I have customer id(sale order id) on that model.

Didn't understand, are you looking to take copy of the sale order from other model ?

Yes..!!!!!!

try something like this , self.env['model_name'].search([('id', '=', 5)]).copy()

Thanks @Niyas,

self.env['operation.process'].search([('id', '=',self.pro_customer_id)]).copy()

Then i getting :

ValueError: Expected singleton: operation.process()

try this, self.env['operation.process'].search([('id', '=',self.pro_customer_id)], limit=1).copy()

this will return only one record, for your case we are getting multiple results in search either you have to use ensure_one or iterate the record over the for loop

Hello @Niyas,

still getting this error

File "/opt/odoo10/odoo/odoo/models.py", line 4388, in copy

self.ensure_one()

File "/opt/odoo10/odoo/odoo/models.py", line 4822, in ensure_one

raise ValueError("Expected singleton: %s" % self)

ValueError: Expected singleton: operation.process()

for code:-

@api.one

def dup_line(self):

print "Copyyyyyyyyyyyyyyy"

self.env['operation.process'].search([('id', '=',self.pro_customer_id)], limit=1).copy()