The sortable_tree activeadmin plugin works for me well with closure tree.
https://github.com/zorab47/active_admin-sortable_tree
It creates a simple hierarchical and sortable view.
Just put the following in your tree model resource (app/admin/TreeModel): (assuming Rails >4, replace <..> with your values)
ActiveAdmin.register TreeModel do
config.filters = false # the default filters don't work unfortunately
permit_params <YOUR_TREE_MODEL_ATTRIBUTES>
sortable tree: true,
sorting_attribute: :<YOUR_SORT_ATTRIBUTE>,
parent_method: :parent,
children_method: :children,
roots_method: :roots
index :as => :sortable do
label :name # item content
actions
end
end