Unmaintainable

gistfile1.rb

1.9.3p125 :001 > User
 => User(id: integer, name: string, created_at: datetime, updated_at: datetime) 
1.9.3p125 :002 > User.create name: 'test'
 => #<User id: 1, name: "test", created_at: "2012-08-15 06:58:45", updated_at: "2012-08-15 06:58:45"> 
1.9.3p125 :003 > u = User.first
 => #<User id: 1, name: "test", created_at: "2012-08-15 06:58:45", updated_at: "2012-08-15 06:58:45"> 
1.9.3p125 :004 > u.last_name
NoMethodError: undefined method `last_name' for #<User:0x007fa9a59a9d08>
1.9.3p125 :005 > u.last_name = 'failed'
NoMethodError: undefined method `last_name=' for #<User:0x007fa9a59a9d08>
1.9.3p125 :006 > uu = User.find_by_sql %[SELECT *, 'passed' AS last_name FROM users;].first
 => #<User id: 1, name: "test", created_at: "2012-08-15 06:58:45", updated_at: "2012-08-15 06:58:45">
1.9.3p125 :007 > uu.last_name
 => "passed" 
1.9.3p125 :008 > uu.last_name = 'passed again'
 => "passed again" 
1.9.3p125 :009 > uu.last_name
 => "passed again" 
1.9.3p125 :010 > uu.save
 => true 
1.9.3p125 :011 > uu.reload.last_name
 => "passed again" 
1.9.3p125 :012 > uu = User.first
 => #<User id: 1, name: "test", created_at: "2012-08-15 06:58:45", updated_at: "2012-08-15 07:00:59"> 
1.9.3p125 :013 > uu.last_name
NoMethodError: undefined method `last_name' for #<User:0x007fa9a5dd3fa0>