I am looking for the most effective way to display categorized pages.

Page model:
  acts_as_tree
  belongs_to :theme

(has attribute "title")

Theme model:
  has_many :pages

(has attribute "name")

I'd like to display all the children (titles) of the current page but
grouping these pages in themes they belong to.

I imagine that code "extracts" unique themes from @page.children and
then iterates through these themes and displays just pages (titles) that
are children of the current page and belong to proper themes.

This should print the following data:

Theme_X
 - page_b
 - page_f
 - page_m
Theme_Y
 - page_c
 - page_g
 - page_l
Theme_ ...

where page_? is the child of the current page.

How to do it effectively? Any help appreciated.
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