Hi LaoThai,

Related Field

There is not anymore fields.related fields.

Instead you just set the name argument related to your model:

participant_nick = fields.Char(string='Nick name',
                               related='partner_id.name')

The type kwarg is not needed anymore.

Setting the store kwarg will automatically store the value in database. With new API the value of the related field will be automatically updated, sweet.

participant_nick = fields.Char(string='Nick name',
                               store=True,
                               related='partner_id.name')

Chained related fields modification will trigger invalidation of the cache for all elements of the chain.

for more details, please refer this link for related field: \Related Field