ruby on rails - default sort order for an activerecord model? -

this question has answer here:

• activerecord find not sorting id? 4 answers

if didn't set default_scope in model(account), , call account.first, item returned ?

here axample: account table have 5 records, account.all returns:

  account.all.map{ |x| {id: x.id, name: x.name, created_at: x.created_at, updated_at:x.updated_at}}   account load (0.5ms)  select "accounts".* "accounts" => [{:id=>2,   :name=>"hessel, kirlin , gulgowski",   :created_at=>wed, 04 sep 2013 00:44:33 edt -04:00,   :updated_at=>wed, 04 sep 2013 00:44:33 edt -04:00},  {:id=>3,   :name=>"hessel, kirlin , gulgowski",   :created_at=>wed, 04 sep 2013 00:44:34 edt -04:00,   :updated_at=>wed, 04 sep 2013 00:44:34 edt -04:00},  {:id=>4,   :name=>"hessel, kirlin , gulgowski",   :created_at=>wed, 04 sep 2013 00:44:34 edt -04:00,   :updated_at=>wed, 04 sep 2013 00:44:34 edt -04:00},  {:id=>5,   :name=>"hessel, kirlin , gulgowski",   :created_at=>wed, 04 sep 2013 00:44:35 edt -04:00,   :updated_at=>wed, 04 sep 2013 00:44:35 edt -04:00},  {:id=>1,   :name=>"eis",   :created_at=>wed, 04 sep 2013 00:44:31 edt -04:00,   :updated_at=>wed, 04 sep 2013 00:44:32 edt -04:00}] 

account.first return record id 2, didn't set default_scope in model, why id 2 not id 1?

thanks !

update: answer(https://stackoverflow.com/a/4986620/655621)

my understanding in absence of order default order id used, not seem case in 3.2.13 @ least

2.0.0p247 :001 > book.first   book load (60.0ms)  select "books".* "books" limit 1 

so maybe there has been code change in recent versions. version using?