"Array isn't supported as a Menu ID" error when attempting to double nest menus #9009

drewnichols · 2026-04-29T21:03:19Z

drewnichols
Apr 29, 2026

It seems the feature described here was removed. Is this correct, or does the documentation need to be updated?

activeadmin/docs/2-resource-customization.md

Lines 241 to 247 in 3ee3a24

    
           To further nest an item under a submenu, provide an array of parents. 
        
           ```ruby 
        
           ActiveAdmin.register Post do 
        
             menu parent: ["Admin", "Blog"] 
        
           end 
        
           ```

When I attempt to make use of it, I get the following backtrace:

Array isn't supported as a Menu ID
exception="TypeError" message="Array isn't supported as a Menu ID" backtrace="/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/menu.rb:102:in `normalize_id'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/menu.rb:29:in `[]'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/menu.rb:53:in `add'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/menu_collection.rb:19:in `add'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/resource/menu.rb:55:in `add_to_menu'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/namespace.rb:151:in `block (2 levels) in build_menu_collection'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/resource_collection.rb:25:in `each'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/resource_collection.rb:25:in `each'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/namespace.rb:150:in `block in build_menu_collection'
/Users/drewnichols/.gem/ruby/3.3.9/gems/activeadmin-4.0.0.beta19/lib/active_admin/menu_collection.rb:77:in `block in run_on_build_callbacks'"

It was added in 2020 here: #5994

and seems to have been removed in 2023 here: #8162

tagliala · 2026-04-29T21:39:56Z

tagliala
Apr 29, 2026
Maintainer

Hello,

it is correct. The documentation refers to v3, but I can see that the bug is related to v4 beta.19

Refs:

Does this answer this question?

0 replies

drewnichols · 2026-04-30T03:18:04Z

drewnichols
Apr 30, 2026
Author

Do we know if there is anything in the new v4 menus that prevents more than 2 tiers? I'd like to make use of 3 tiers but if something is blocking that I'll leave it be. Otherwise, I may try and restore the nested menu feature.

0 replies

tagliala · 2026-04-30T08:45:26Z

tagliala
Apr 30, 2026
Maintainer

Sorry, I do not use this feature. Converting this to a discussion

0 replies

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