class ActiveModel::Errors

# => ["Name is too short (minimum is 5 characters)", "Name can't be blank", "Email can't be blank"]
person.errors.full_messages
person = Person.create(address: '123 First St.')

end
validates_length_of :name, in: 5..30
validates_presence_of :name, :address, :email
class Person

Returns all the full error messages in an array.

def full_messages
  @errors.map(&:full_message)
end