Hi , Here its from API guidelines..

Searching

Searching has not changed a lot. Sadly the domain changes announced did not meet release 8.0.

You will find main changes below.

search

Now seach function returns directly a RecordSet:

>>> self.search([('is_company', '=', True)])

res.partner(7, 6, 18, 12, 14, 17, 19, 8,...)

>>> self.search([('is_company', '=', True)])[0].name

'Camptocamp'

You can do a search using env:

>>> self.env['res.users'].search([('login', '=', 'admin')])

res.users(1,)

search_read

A search_read function is now available. It will do a search and return a list of dict.

Here we retrieve all partners name:

>>> self.search_read([], ['name'])

[{'id': 3, 'name': u'Administrator'},

{'id': 7, 'name': u'Agrolait'},

{'id': 43, 'name': u'Michel Fletcher'},

...]