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New Not what he meant
From your example, it looks like the concept of walking the tree is handled automagically. In the set tree model you have updates something like:
update comments set lft = lft + 1 where lft > input1 and rgt < input2

If Rails typically hides SQL details from you, requiring you to walk the tree, this becomes a problem.
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New Re: Not what he meant
If Rails typically hides SQL details from you, requiring you to walk the tree, this becomes a problem.

ActiveRecord (the Rails ORM) is just a very thin layer of code on top of SQL. This makes it dirt easy to customize the SQL for fetching or updating. I don't think this will be a problem.

However, I'm not a heavy-duty user of AR, so it will be fun to play with this and see exactly how this all falls out.
--
-- Jim Weirich jim@weirichhouse.org [link|http://onestepback.org|http://onestepback.org]
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"Beware of bugs in the above code; I have only proved it correct,
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)
     How do you manage database changes? - (admin) - (21)
         Re: How do you manage database changes? - (JimWeirich) - (11)
             Mind responding to some rails criticism? - (ben_tilly) - (10)
                 I would be interested to see... - (admin) - (8)
                     A Nested Comments Example - (JimWeirich) - (7)
                         Either one of us is missing something, or Rails is magic - (drewk) - (6)
                             I Missed Something - (JimWeirich) - (5)
                                 Adjacency trees are simple. - (admin) - (4)
                                     Re: Adjacency trees are simple. - (JimWeirich) - (3)
                                         The arbitrary SQL somewhat answers my question... - (admin)
                                         Not what he meant - (drewk) - (1)
                                             Re: Not what he meant - (JimWeirich)
                 Re: Mind responding to some rails criticism? - (JimWeirich)
         Weekly change scripts - (Yendor) - (3)
             We do something like that. - (static) - (2)
                 Oh, *that* process will scale well :-/ -NT - (drewk) - (1)
                     Tell me about it. - (static)
         We make them independent of code, and do them first - (ben_tilly) - (2)
             Automated or no? -NT - (admin) - (1)
                 No - (ben_tilly)
         Two answers - (tuberculosis)
         Re: How do you manage database changes? - (dws)

GAWD have these people never used SOFTWARE before!!!!!!!!!!
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