Hello, i got a model (book) where i can add books and assign authors to them (res.partner) in many2many: authors = fields.Many2many('res.partner', string='Authors')

I then made another model which inherits from res partner to add a boolean 'isAuthor', that way i can filter them in a graph.



Now i want to add a computed field that counts how many books an author has.

I made this:

nbBooks = fields.Integer('Number of authored books', compute='nombre_livre_auteur', store=True)

#@api.depends("author")