question and serialized attribute methods should raise ActiveRecord::MissingAttributeError.

When doing a find and specifying :select, ActiveRecord will raise a MissingAttributeError if you try to access an attribute that wasn't included in the :select.

It will not, however, raise that error if you access serialized attributes or the question method of a boolean attribute. This patch fixes that (and adds tests to cover it).

Given this ActiveRecord model:

class User < ActiveRecord::Base
  # column :name, :string
  # column :data, :text
  # column :active, :boolean







  serialize :data
end

And this database record:

User.create!(:name => 'Bob', :data => [], :active => true)

Before this patch:

u = User.find(:first, :select => 'id')
u.name #=> raises ActiveRecord::MissingAttributeError
u.active #=> raises ActiveRecord::MissingAttributeError
u.active? #=> nil
u.data #=> nil

After this patch:

u = User.find(:first, :select => 'id')
u.name #=> raises ActiveRecord::MissingAttributeError
u.active #=> raises ActiveRecord::MissingAttributeError
u.active? #=> raises ActiveRecord::MissingAttributeError
u.data #=> raises ActiveRecord::MissingAttributeError