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2008 Jul 04
2
How do change catalog before catalog is delted?
In my rails application,there are two models:post and catalog.
One post has a catalog,and one catalog has many posts.
When I delete a catalog,the posts belongs to the catalog will not be
shown normal,for it''s catalog is no existed.
Now I want to create(if the ''Defalut catalog'' is not existed) a
''Defalut catalog'' in catalogs table,and make the