Question

Rails Admin was working fine until I installed Devise_Invitable. Now, when I click on Users in Rails Admin I get the following error:

NoMethodError in RailsAdmin::MainsController#list

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.map

The other models work fine.

I have a hunch that this might be part of the trouble:

https://github.com/sferik/rails_admin/issues/370

as this is part of the devise_invitable

 belongs_to :invited_by, :polymorphic => true

It says the issue is fixed but is there any way I don’t have the most recent rails admin?

gemfile

gem 'rails_admin', :git => 'git://github.com/sferik/rails_admin.git'

Thanks for any ideas.

Answer 1

The answer that has you add has_many :invitees, :class_name => self.class.name, :as => :invited_by to the User model works to get rails_admin working, but I ran into problems deleting and editing. The solution is to change the line you add to the User model to:

has_many :invitees, :class_name => "User", :as => :invited_by