How to use a many2one field in Odoo 12?

Question

I have two class in python file (odoo version is 12):

class Module_procede(models.Model):
    _name = 'moduletest.procede'

    pr = fields.Char("firstname", default='???', required=True)
    mp = fields.Char("lastname", required=True)


class Module_procede(models.Model):
    _name = 'moduletest.prix'

    pr_ = fields.Char("firstname", default='???', required=True)
    mp_ = fields.Char("lastname", required=True)

How to make relation Many2one for field "pr_" like this:

pr = fields.Many2one(pr_)

Answer 1

Odoo Documentation explain it well. You can check for some examples in the Odoo source code as well:

class ModuleProcede(models.Model):
    _name = 'moduletest.procede'

    pr = fields.Char("firstname", default='???', required=True)

class ModulePrix(models.Model):
    _name = 'moduletest.prix'

    pr_ = fields.Many2one(
        string=_('First name'),
        comodel_name='moduletest.procede',
    )

If you want to get the opposite just move the many2one field to the other model