Okay. Here is the solution
In ApplicationController:
before_filter do
@main_menu = Page.where(active: true, show_in_main_menu:
true).arrange(order: :position)
def menu_ids(attributes, mids = [])
attributes.map do |attribute, sub_attributes|
if sub_attributes.empty?
mids << attribute.id.to_s
else
mids << attribute.id.to_s
menu_ids(sub_attributes, mids)
end
end
mids
end
@menu_ids = menu_ids(@main_menu)
end
In ApplicationHelper:
def main_menu(attributes)
attributes.map do |attribute, sub_attributes|
if sub_attributes.empty?
if @menu_ids.include?(attribute.parent_id.to_s)
content_tag(:li) do
link_to attribute.name.html_safe, page_path(attribute._id)
end
end
else
if attribute.parent_id == nil
content_tag(:li, nil, class: "dropdown") do
begin
link_to( attribute.name.html_safe, page_path(attribute._id))+
(icon('angle-double-right') if !attribute.is_root?)+
content_tag(:ul, nil) do
main_menu(sub_attributes)
end
end.html_safe
end
else
if @menu_ids.include?(attribute.parent_id.to_s)
content_tag(:li, nil, class: "dropdown") do
begin
link_to( attribute.name.html_safe, page_path(attribute._id))+
(icon('angle-double-right') if !attribute.is_root?)+
content_tag(:ul, nil) do
main_menu(sub_attributes)
end
end.html_safe
end
end
end
end
end.join.html_safe
end
And it finally works like I wanted
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