rails validation - custom validations

Question

I'm trying to validate 4 fields with the same validation on the user model as they sign up. I don't want to have to write 4 different methods with the same logic.

I'm validating the following fields first_name, last_name, user_name and nickname. This is what I'm checking

 def validate_input 
   if first_name.present? && first_name.start_with?("=", "@", "-", "+")
    first_name.prepend('`')
   end
 end

How can I go about this method without having to repeat myself 4 times with the same method?

guides.rubyonrails.org/… You can either use a simple method (see 6.2 Custom Methods) or write a full-on validator (6.1). 6.2 might be easier. That said: this isn't a validation, this is a modification, so I'm not sure this would be the right thing to do anyway. — Dave Newton
– Dave Newton, Commented Mar 11, 2021 at 20:42

Hackman · Accepted Answer · 2021-03-15 03:48:35Z

3

I think you are not validating the fields. Instead, you are modifying them. So, the logic should go into the callback.

before_save :sanitize_the_names

def sanitize_the_names
  [:first_name, :last_name, :user_name, :nickname].each do |field|
    self.public_send(field).prepend('`') if field_invalid?
  end
end

def field_invalid?
  self.public_send(field).present? && self.public_send(field).start_with?('=', '@', '-', '+')
end

edited Mar 15, 2021 at 3:48

Hackman

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answered Mar 12, 2021 at 9:21

Suraj Rajput

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