Attempt to use FriendlyId on the front end and not on the ActiveAdmin backend
In order to use FriendlyId for the front end app and id for the backend ActiveAdmin modify your controller like so:
ActiveAdmin.register Post do
controller do
around_filter do |controller, action|
Post.class_eval do
def to_param
id.to_s
end
end
begin
action.call
ensure
Post.class_eval do
def to_param
slug
end
end
end
end
end
end