what does self.ensure_one() means ?

Question

Yenthe Van Ginneken (Mainframe Monkey) · Accepted Answer

Hi MouBou,
self.ensure_one is made to ensure that only one record is being passed on. It checks that the current record is a singleton (so just one record, not multiple records). If self would contain multiple records the system would throw up an error. An example case to check you just have one record:
@api.multi
def some_fuction(self):
# This will make sure we have on record, not multiple records.
self.ensure_one()
When you would run this code with a selection of records (for example selecting

iWesabe Technologies · Answer

This function will be called !!!

Thanks !!
iWesabe [1]

[1] http://www.iwesabe.com/

dimas aditya · Answer

In odoo 15, this is what ensure_one do
def ensure_one(self):
"""Verify that the current recorset holds a single record.
:raise odoo.exceptions.ValueError: ``len(self) != 1``
"""
try:
# unpack to ensure there is only one value is faster than len when true and
# has a significant impact as this check is largely called
_id, = self._ids
return self
except ValueError:
raise ValueError("Expected singleton: %s" % self)

Subhanullah · Answer

To reply your second question,
You can use @api.one, but since @api.one put returned value in a list and it is not always supported by the web client, therefore most of the developers uses@api.multi with self.ensureone().
Refer to this link for more details,
http://odoo-new-api-guide-line.readthedocs.io/en/latest/decorator.html

Thang Duong Bao · Answer

@Yenthe: so why not use @api.one only, example:
@api.one
def some_fuction(self):
# ...

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