Module: ActiveAdmin::ResourceController::Streaming

Included in:
ActiveAdmin::ResourceController
Defined in:
lib/active_admin/resource_controller/streaming.rb

Overview

This module overrides CSV responses to allow large data downloads. Could be expanded to JSON and XML in the future.

Instance Method Summary collapse

Instance Method Details

#csv_filename ⇒ Object (protected) 



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# File 'lib/active_admin/resource_controller/streaming.rb', line 33

def csv_filename
  "#{resource_collection_name.to_s.gsub('_', '-')}-#{Time.zone.now.to_date.to_formatted_s(:default)}.csv"
end

#index ⇒ Object 



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# File 'lib/active_admin/resource_controller/streaming.rb', line 12

def index
  super do |format|
    format.csv { stream_csv }
    yield(format) if block_given?
  end
end

#stream_csv ⇒ Object (protected) 



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# File 'lib/active_admin/resource_controller/streaming.rb', line 37

def stream_csv
  headers["Content-Type"] = "text/csv; charset=utf-8" # In Rails 5 it's set to HTML??
  headers["Content-Disposition"] = %{attachment; filename="#{csv_filename}"}
  stream_resource &active_admin_config.csv_builder.method(:build).to_proc.curry[self]
end

#stream_resource(&block) ⇒ Object (protected) 



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# File 'lib/active_admin/resource_controller/streaming.rb', line 21

def stream_resource(&block)
  headers["X-Accel-Buffering"] = "no"
  headers["Cache-Control"] = "no-cache"
  headers["Last-Modified"] = Time.current.httpdate

  if ActiveAdmin.application.disable_streaming_in.include? Rails.env
    self.response_body = block[String.new]
  else
    self.response_body = Enumerator.new &block
  end
end