Unknown primary key for table page_hierarchies in model PageHierarchy

[mcmegavolt]

I'm using rails 5.1.4 with activeadmin

When try to load pages index in ActiveAdmin got the error

Showing /home/ap/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/activeadmin-1.2.0/app/views/active_admin/resource/index.html.arb where line #2 raised:

Unknown primary key for table page_hierarchies in model PageHierarchy.

def primary_key(klass)
  klass.primary_key || raise(UnknownPrimaryKey.new(klass))
end

My page model

class Page < ApplicationRecord
  ...
  has_closure_tree order: 'sort_order'
  ...
end

[hirokishirai]

+1

[mmorast]

+1

[tomlockwood]

+1

[danthecrane]

+1

[aykc]

Try:
rails g migration AddPrimaryKeyToPageHierarchies id:primary_key
rails db:migrate
This helped to me

[mmitchellg5]

Will this PK added cause any issues?

[aykc]

probably not, it's just a regular primary key field