When downloading a csv of a model using active admin hat had around 24k records. But the csv was limited to only 10krows of data ,as it's hardcoded in active admin https://github.com/gregbell/active_admin/blob/master/lib/active_admin/resource_controller/data_access.rb#L276 . So if we try to download the CSV which have more then 12,000 records it…

active_admin.rb

# Monkey patch to increase the number of records
# exported in csv download -default is 10k
module ActiveAdmin
  class ResourceController
    module DataAccess
      # in active admin 0.6
      def max_csv_records
        30_000
      end
      # needed for current active admin master
      def max_per_page
        30_000
      end
    end
  end
end