ruby on rails - Active admin custom filter with active record relations -

here problem:

i have 3 models:

taxons

class taxon < activerecord::base    has_and_belongs_to_many :categories, :uniq => true

categories

class category < activerecord::base   has_and_belongs_to_many :taxons,       :uniq => true   has_many :products

and products

class product < activerecord::base   belongs_to :category

in active admin, have add custom filter searching products taxons.

if have idea, how todo it, gratefull help.

p.s. have nested set in taxons, if that's important

Three