# Hibernate on Ruby **URL:** \ **Category:** Ruby\ **Created:** [December 12, 2005, 10:49pm UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090 "2005-12-12T22:49:54Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 12, 2005, 10:49pm UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/1 "2005-12-12T22:49:54Z")
Any ideas on using Hibernate OR/M from within Ruby? ---
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 12, 2005, 10:52pm UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/2 "2005-12-12T22:52:54Z")
Why, when you have Og, ActiveRecord and a few other interesting choices? T. ---
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 12, 2005, 10:58pm UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/3 "2005-12-12T22:58:55Z")
ActiveRecord is great for small-to-medium things, but does quickly show it’s limits on large things. NOTE: Please, do not turn this thread into a flame war. See Martin F.'s discussion of ActiveRecord versus DataMapper. Rails’s ActiveRecord is based on Fowler’s ActiveRecord pattern, wheras Hibernate is a DataMapper, which Fowler himself favors for complicated mappings. See DHH’s post: “No, you don’t get the full offer of opportunities that straight OO with a data mapper holds. I’d like to think, though, that Active Record gives you 80% of the features for 20% of the effort.” [http://www.loudthinking.com/arc/000209.html](http://www.loudthinking.com/arc/000209.html) Example for me: Let’s say I have a class hierarchy, in which a particular field is stored direclty in the db for one class, and calculated using a simple SQL formula for other other classes. How can I use the DB to query the tree for all objects where field == aVal. Answer: In ActiveRecord - you can’t (w/o major hacking). You need to instantiate each one from the db, and then use Ruby to check each one. ---
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 12, 2005, 11:54pm UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/4 "2005-12-12T23:54:52Z")
List R. wrote: > ActiveRecord is great for small-to-medium things, but does quickly show > it’s limits on large things. NOTE: Please, do not turn this thread > into a flame war. See Martin F.'s discussion of ActiveRecord > versus DataMapper. Rails’s ActiveRecord is based on Fowler’s > ActiveRecord pattern, wheras Hibernate is a DataMapper, which Fowler > himself favors for complicated mappings. > > See DHH’s post: > “No, you don’t get the full offer of opportunities that straight OO > with a data mapper holds. I’d like to think, though, that Active Record > gives you 80% of the features for 20% of the effort.” > [http://www.loudthinking.com/arc/000209.html](http://www.loudthinking.com/arc/000209.html) > > Example for me: > Let’s say I have a class hierarchy, in which a particular field is > stored direclty in the db for one class, and calculated using a simple > SQL formula for other other classes. How can I use the DB to query the > tree for all objects where field == aVal. > > Answer: In ActiveRecord - you can’t (w/o major hacking). You need to > instantiate each one from the db, and then use Ruby to check each one. Google up Og and Kansas and see if either suits you better. Both take a modeling approach perpendicular to AR. There are others also, I am sure. Or, of course, you could restructure your data 🙂 E ---
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 13, 2005, 2:50am UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/5 "2005-12-13T02:50:50Z")
Zed A. Shaw wrote: > No, that’d actually involve admitting he is wrong. The day a > programmer actually admits he’s wrong is the day Satan ice skates > around Times Square in July eating Tasti-Delight while wearing long > underwear. Yeah, that’s the way, go off on a tangent and berate someone for asking a simple question, without actually giving him a straight answer. Now I remember why I unsubscribed from this group before… – Neil S. - removed\_email\_address@domain.invalid ‘A republic, if you can keep it.’ – Benjamin Franklin ---
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 13, 2005, 2:41am UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/6 "2005-12-13T02:41:47Z")
On Tue, 13 Dec 2005 07:55:02 +0900 Eero S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Google up Og and Kansas and see if either suits you better. > Both take a modeling approach perpendicular to AR. There > are others also, I am sure. > > Or, of course, you could restructure your data 🙂 No, that’d actually involve admitting he is wrong. The day a programmer actually admits he’s wrong is the day Satan ice skates around Times Square in July eating Tasti-Delight while wearing long underwear. For another great example of “fighting to always be right” refer to any thread about plural table names (either side). Zed A. Shaw > **[Zed A. shaw](https://zedshaw.com/)** > > Personal essays and writings by Zed A. Shaw. ---
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 13, 2005, 4:38am UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/7 "2005-12-13T04:38:59Z")
Thanks for the support Neil. ---
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 13, 2005, 3:34pm UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/8 "2005-12-13T15:34:58Z")
On 12/12/05, removed\_email\_address@domain.invalid [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Thanks for the support Neil. I won’t claim to support this idea. Personally, I think it’s like having your whole BMW chromed. Heh. However, you should be able to actually do it with something like: [http://rjni.rubyforge.org/](http://rjni.rubyforge.org/) …or: [http://raa.ruby-lang.org/project/rjb/](http://raa.ruby-lang.org/project/rjb/) I’m not sure if there’s a good way to gen the XDoclet tags in Ruby. Presumably there’s a fancy ERb trick you can use. ---
**Author:** ![lstrecv](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/e68b1a/32.png) [@lstrecv](https://www.ruby-forum.com/u/lstrecv)\ **Post date:** [December 13, 2005, 11:03am UTC](https://www.ruby-forum.com/t/hibernate-on-ruby/50090/9 "2005-12-13T11:03:50Z")
removed\_email\_address@domain.invalid ha scritto: > Any ideas on using Hibernate OR/M from within Ruby? probably the only chance is using jruby, but are you sure you can’t do what you want with Og ?