[Rails] Routes :requirments

I want to set a route :requirements on an array that verifies a
particular parameter is included in an array.

Something to the effect of:

<pre>
atypes = [:culture, :personality, :communication]
map.with_options(:path_prefix => ':atype',
:requirements => {:atype => atypes.include?(:atype)}) do |assessment|
...
end
</pre>

I haven't been able to find any documentation on how to accomplish this.
Any help would be appreciated.
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