Question

I have a form that gets a users name.

If this name is valid then I send them to another form to enter in their email, password etc.

I want to validate the name only.

Is there a way to do @user.name.valid?

Thanks

Answer 1

No, there is no such method. You can however write your own:

class User < ActiveRecord::Base
  ...
  def attribute_valid?(name)
    if valid?
      true
    else
      !!self.errors[name]
    end
  end
  ...
end

Although this basically runs all validations and later checks whether your concrete attribute was among the bad ones. So, if you are looking for performance, this is not the solution.