rubyonrailsin

hi

i have two models:
GeoRegion & GeoRegionSub

which have a has_many relation to each other.

how can include the has_many relation in the collection_select helper? i want to have that dropdown where the parent is in black and the children indented.

<%= collection_select :dl,:parent_id, GeoRegion.all.????, :id, :title %>


thx

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