class ActiveModel::StrictValidationFailed

# => ActiveModel::StrictValidationFailed: Name can’t be blank
person.valid?
person.name = nil
person = Person.new
end
validates_presence_of :name, strict: true
attr_accessor :name
include ActiveModel::Validations
class Person
exceptional.
Raised when a validation cannot be corrected by end users and are considered
= Active Model StrictValidationFailed