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Dependent select boxes in rails with collect

i have three select list fill with collect, but from same "product" table:

Categoria:<%= select :search, :search1, [["Seleccionar", "none"]] + Product.all(:group => "category", :order => "category").collect {|a| [a.category, a.category]} %>

Subcategoria:<%= select :search, :search2, [["Seleccionar", "none"]] + Product.all(:group => "subcategory", :order => "subcategory").collect {|b| [b.subcategory, b.subcategory]} %>

Subcubategoria:<%= select :search, :search3, [["Seleccionar", "none"]] + Product.all(:group => "subsubcategory", :order => "subsubcategory").collect {|c| [c.subsubcategory, c.subsubcategory]} %>

so i like dependent each other. any idea please?

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