2009/5/21 Stephan Wehner <[email protected]> > > Colin Law wrote: > > 2009/5/21 Stephan Wehner <[email protected]> > > > >> > >> > > I am trying to avoid a db query each time I reference the (constant) id > > when > > the application is running, that was the idea of looking it up when the > > class is loaded and saving in a constant (which does not work in test > > mode > > as the fixtures have not always been loaded when the class is loaded) > > > > I meant it is not clear what the nature of this special record is, and > what conditions you have. > > >> > >> > >> If for the Item class there is just this one special record, can you > >> force the id to be simply 0 by manipulating the database? > >> > > > > My initial solution was to have a well-known id for the special record. > > The > > problem with this in testing is that one has to then include the special > > record with that id explicitly in the fixture. One cannot then make use > > of > > the automatic fixup of habtm tables using the names of the fixture > > records > > and so have to manually provide fixtures for the habtm join tables. > > Plus > > the idea of a record in the db having a well-known id is a bit yucky. > > How about adding this method to your Item class: > > # is this the special record "named_scope_for_constant_record" ? > def special? > @@special_record_id ||= Item.named_scope_for_constant_record.id > self.id == @@special_record_id_id > end >
Of course, I should have thought of using a global variable rather than a constant. I didn't because I generally consider global variables to be evil. I think this may be the first time for many a year that I have found a good use for one. Though really, though technically it is a global variable, it is being used as a constant. Problem solved, many thanks for helping Colin > > There is a thread-issue around using ||= ( > > http://coderrr.wordpress.com/2009/04/29/is-not-thread-safe-neither-is-hashnew-hk > ) but that doesn't matter here. > > Now you can even stub the special? method. Also, if the condition for > special? changes you just change the method. > > Stephan > > > Colin > > -- > Posted via http://www.ruby-forum.com/. > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
