Hi, Akshay

In order to handle unique field error. You can add try except in your controller like below,

from psycopg2 import IntegrityError 
from odoo.exceptions import ValidationError

def yourMethod():
    try:
        #YourDefination
    exceptValidationError as e:
        print("Validation Error")
    exceptIntegrityError as e:
        print("Integrity Error")

Thanks,

Ashish Singh (Team Lead)

Webkul Software Private Limited