When you use find, you can include related objects with include so that
both objects get instantiated in the results, e.g. Foo.find(:all,
:include => :bar).
But when you use find_by_sql, is there a way to do this? You could
definitely write the find_by_sql SQL to join Foo and Bar tables:
Foo.find_by_sql("SELECT foo.*, bar.* from foo, bar where foo.bar_id
bar.id")
But is there a way to instantiate not just the Foo object but also the
Bar object in the results that come back?
thanks,
jeff
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Jeff wrote:> When you use find, you can include related objects with include so that > both objects get instantiated in the results, e.g. Foo.find(:all, > :include => :bar). > > But when you use find_by_sql, is there a way to do this? You could > definitely write the find_by_sql SQL to join Foo and Bar tables: > Foo.find_by_sql("SELECT foo.*, bar.* from foo, bar where foo.bar_id > bar.id") > But is there a way to instantiate not just the Foo object but also the > Bar object in the results that come back?Yes: Install the AR mod at http://mrj.bpa.nu/eager_custom_sql.rb , add the include option, then write your SQL using the tn_rm field alias pattern used by Rails'' eager loading. -- We develop, watch us RoR, in numbers too big to ignore. --~--~---------~--~----~------------~-------~--~----~ 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 rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk -~----------~----~----~----~------~----~------~--~---
Thank you for that, Mark. Regarding the field aliasing, can I simply write my select as "SELECT t0.*, t1.* FROM t0, t1 WHERE ... " or do I explicitly have to select each column, like "SELECT t0.id as id, t0.name as name, etc..." thanks, jeff Mark Reginald James wrote:> > Yes: Install the AR mod at http://mrj.bpa.nu/eager_custom_sql.rb , > add the include option, then write your SQL using the tn_rm field > alias pattern used by Rails'' eager loading. >--~--~---------~--~----~------------~-------~--~----~ 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 rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk -~----------~----~----~----~------~----~------~--~---
Jeff wrote:> Thank you for that, Mark. Regarding the field aliasing, can I simply > write my select as > "SELECT t0.*, t1.* FROM t0, t1 WHERE ... " > > or do I explicitly have to select each column, like > "SELECT t0.id as id, t0.name as name, etc..."As things stand you have to explicitly alias every field: select foo.id as t0_r0, foo.f1 as t0_r1, bar.id as t1_r0, bar.f1 as t1_r1 Actually, you can skimp and select only the fields you''re going to use. -- We develop, watch us RoR, in numbers too big to ignore. --~--~---------~--~----~------------~-------~--~----~ 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 rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk -~----------~----~----~----~------~----~------~--~---