Rails: activeadmin, undefined method `per' for #

Question

I installed ActiveAdmin successfully:

My gemfile code:

source \'https://rubygems.org\'

 gem \'rails\', \'3.2.10\'

 # Bundle edge Rails instead:
         


        

Answer 1

If you are using kaminari and will_paginate together, you will definitely face this error. In short, kaminari and will_paginate are incompatible to each other. If you are using rails_admin (which uses kaminari for pagination) and also using will_paginate, you will need to add the following code to one of the initializers under config directory or you can create a new file, let say with name'will_paginate' add the code, and place it into initializers directory.

if defined?(WillPaginate)
  module WillPaginate
    module ActiveRecord
      module RelationMethods
        def per(value = nil) per_page(value) end
        def total_count() count end
      end
    end
    module CollectionMethods
      alias_method :num_pages, :total_pages
    end
  end
end

Answer 2

You can create an Initializer for Kaminari, like this:

Kaminari.configure do |config|
  config.page_method_name = :per_page_kaminari
end

In my experience, I had to restart the server to make it work. That's all.