Rails Active Admin resource problem - ruby-on-rails-3

Question

I recently have watched railscast 284 about active admin and wanted to implement it into my web app, however I am running into an issue when I add a resource. I get the following message every time I try to navigate to the created tab:
NameError in Admin::LoadsController#index
undefined local variable or method `per' for []:ActiveRecord::Relation
Rails.root: /Users/thomascioppettini/rails_projects/want-freight
Application Trace | Framework Trace | Full Trace
Request
Parameters:
{"order"=>"id_desc"}
Show session dump
Show env dump
Response
Headers:
None
The only thing I can think of that may affect the application is adding a recaptcha to devise, which active admin depends on.

Answer 1

For me, it looks like this is a pagination problem. What gem are you using? You should give as more details about your settup. Can you show us your resource file from admin directory? What version of rails and what ActiveAdmin are you using ?

Answer 2

If you are using the will_paginate gem, set the version to 3.0.pre2. I was using ~>3.0.pre2, which auto-updated to 3.0.2 when I ran a bundle update Reverting fixed the issue. If you're using Bundler, the line is this:
gem "will_paginate", "3.0.pre2"

Answer 3

I agree with Dawaid. It is a pagiantion error. Add "Kaminari" gem to you Gemfile. According to active admin docs, it is using kaminari for pagination.. will_paginate will also work for you as swilliams described...

Answer 4

As I understand active_admin doesn't support will_paginate anymore. But if you don't want to rewrite your pagination to Kaminari you can fix this problem with putting some code to initializers
# config/initializers/will_paginate.rb
if defined?(WillPaginate)
module WillPaginate
module ActiveRecord
module RelationMethods
alias_method :per, :per_page
alias_method :num_pages, :total_pages
end
end
end
end
module ActiveRecord
class Relation
alias_method :total_count, :count
end
end