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ruby-1.9.2-head > params2 = {:filter => 'nearest'}

 => {:filter=>"nearest"}

ruby-1.9.2-head > f = Filter.new(params2)

 => #<Filter:0x00000105032338 @params={:filter=>"nearest"}>

 

ruby-1.9.2-head > params = {:filter => 'nearest', :radius => 1000}

 => {:filter=>"nearest", :radius=>1000}

ruby-1.9.2-head > f = Filter.new(params)

 => #<Filter:0x00000105012a38 @params={:filter=>"nearest", :radius=>1000}, @radius=#<Radius:0x0000010455f708 @radius=1000, @validation_context=nil, @errors={}>>