account_handler (but in form using "username" textfield)
password_hash (in form using "password" textfield)
When I send request using postman it generated error of unknown property exception, how can I assign username value to account_handler and password value into password_hash?
Please use the same account_handler and password_hash in the form too… But think from user point of view change the label alone as Username or Password. Even if you want to follow create a property under your model and manually assign the values.