There is not a single line of code in all of Rails that makes use of the
`.find_all` template API, that doesn't look like this:
`lookup.find_all(*args).first`. Getting rid of the unnecessary Array
handling would simplify the implementation.
Therefore I would like to propose to deprecate and
Assume you have a tree, where you want to have set attributes only, if a
node is a root. Otherwise the model should not accept entries for a
specific attribute.
I.e. if you have a tree of categories and want to have a locale attribute
only on roots you could do s'thing like this:
class
