Rails, Mongoid-Ancestry: Exclude child nodes if parent node is not selected

Rails
1

Hello! Please help with trouble (I think it must be obvious solution)

I have code for displaying main menu:

@main_menu = Page.where(active: true).arrange(order: :position)

It grabs all nodes with active parameter is set to true. But if the
parent
node for some children is set to active:false, they connects to
grandparent
node, and so on. How to avoid this behavior, so if parent node is
excluded
then all children nodes become excluded too?

2

On 20 March 2015 at 06:17, Роман Ярыгин [email protected] wrote:

Hello! Please help with trouble (I think it must be obvious solution)

I have code for displaying main menu:

@main_menu = Page.where(active: true).arrange(order: :position)

It grabs all nodes with active parameter is set to true. But if the parent
node for some children is set to active:false, they connects to grandparent
node, and so on. How to avoid this behavior, so if parent node is excluded
then all children nodes become excluded too?

I think you will need to explain the associations between the models
for us to understand the question. Then explain exactly what is not
happening as you want.

Colin

3

This is the model:

class Page
include Mongoid::Document
include Mongoid::Timestamps
include Mongoid::Ancestry
include Mongoid::Orderable
has_ancestry orphan_strategy: :destroy
orderable column: :position, base: 0

has_many :page_attachment_files

field :name, type: String
field :content, type: String
field :elements_order, type: String, default:
“nav,anounces,news,page_content,albums,paf”
field :show_in_main_menu, type: Boolean, default: true
field :active, type: Boolean, default: true
field :redirect, type: String

validates :name, presence: true
end

When all nodes has attribute active set to :true (like on picture)

https://lh4.googleusercontent.com/-KGGpqXlXqLM/VQz5HaW6bFI/AAAAAAAAAIw/Ccrj1zkcllw/s1600/Снимок%2Bэкрана%2Bот%2B2015-03-21%2B14%3A50%3A20.png

Then all menu on site looks correct

https://lh6.googleusercontent.com/-1d4MyO9yN_c/VQz5Y2j-ZYI/AAAAAAAAAI4/5ns5nqTAJzU/s1600/Снимок%2Bэкрана%2Bот%2B2015-03-21%2B14%3A53%3A41.png

But if set one of parent nodes “active” to false (like that)

https://lh5.googleusercontent.com/-lazObznq07E/VQz5vJL4PnI/AAAAAAAAAJA/FFZItcNlVmo/s1600/Снимок%2Bэкрана%2Bот%2B2015-03-21%2B14%3A55%3A11.png

Then menu breaks: all child nodes are attached to grandparent node (Like
this):

https://lh3.googleusercontent.com/-TOR7XUGCdes/VQz6NcdJYII/AAAAAAAAAJI/I96bq7QF2Po/s1600/Снимок%2Bэкрана%2Bот%2B2015-03-21%2B14%3A57%3A14.png

And I need to exclude all this child nodes if parent node is disabled.
How
to do that?

4

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