clinic/netforce_clinic/models/patient_categ.py

from netforce.model import Model, fields

class PatientCateg(Model):
    _name="clinic.patient.categ"
    _string="Patient Category"

    _fields={
        "name": fields.Char("Name",required=True,search=True),
        "parent_id": fields.Many2One('clinic.patient.categ',"Parent"),
    }

PatientCateg.register()