I set up a column with a singular association, which limits the
available values based on the value of another field (pretty much
identical to the "Chaining Form Fields" page of the wiki).
But when I try to make the field editable using
config.columns[:mycolumn].inplace_edit = :ajax, it breaks when the
scaffold is nested inside another.
The problem, which I was able to patch, is that the URL used by the
ajax call doesn't specify the controller, so it defaults to the
controller of the enclosing scaffold, instead of the nested scaffold.
(I'm using the rails 2.3.2 version, but the relevant code seems the
same in the master version.)

My fix is thus:

File: list_column_helpers.rb
Method: active_scaffold_inplace_edit
Change: added
     :controller => params_for[:controller]
to the params list in the call to "url_for"

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