Error: Fix undefined method `per’ error on Will_Paginate and ActiveAdmin

To work will_paginate and ActiveAdmin:

undefined method `per’ for #<ActiveRecord::Relation:0x000000076rd98h8>

You need to configure an initializer for Kaminari to avoid conflicts. Put this in config/initializers/kaminari.rb

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