invalid?(context = nil)
Instance Public methods
Performs the opposite of valid?. Returns true if
errors were added, false otherwise.
class Person
include ActiveModel::Validations
attr_accessor :name
validates_presence_of :name
end
person = Person.new
person.name = ''
person.invalid? # => true
person.name = 'david'
person.invalid? # => false
Context can optionally be supplied to define which callbacks to test
against (the context is defined on the validations using :o