Add mirroring example

examples/mirroring.rb

@@ -0,0 +1,59 @@
+require 'bundler/setup'
+require_relative 'active_record/ar_setup'
+require 'flipper'
+require 'flipper/adapters/redis'
+require 'flipper/adapters/active_record'
+
+# Say you have production...
+production_adapter = Flipper::Adapters::Memory.new
+production = Flipper.new(production_adapter)
+
+# And production has some stuff enabled...
+production.enable(:search)
+production.enable_percentage_of_time(:verbose_logging, 5)
+production.enable_percentage_of_actors(:new_feature, 5)
+production.enable_actor(:issues, Flipper::Actor.new('1'))
+production.enable_actor(:issues, Flipper::Actor.new('2'))
+production.enable_group(:request_tracing, :staff)
+
+# And you would like to mirror production to staging...
+staging_adapter = Flipper::Adapters::Memory.new
+staging = Flipper.new(staging_adapter)
+staging_export = staging.export
+
+puts "Here is the state of the world for staging and production..."
+puts "Staging"
+staging.features.each do |feature|
+  pp feature: feature.key, values: feature.gate_values
+end
+puts "Production"
+production.features.each do |feature|
+  pp feature: feature.key, values: feature.gate_values
+end
+
+# NOTE: This wipes active record clean and copies features/gates from redis into active record.
+puts "Mirroring production to staging..."
+staging.import(production.export)
+puts "Staging is now identical to Production."
+
+puts "Staging"
+staging.features.each do |feature|
+  pp feature: feature.key, values: feature.gate_values
+end
+puts "Production"
+production.features.each do |feature|
+  pp feature: feature.key, values: feature.gate_values
+end
+
+puts "Restoring staging to original state..."
+staging.import(staging_export)
+puts "Staging restored."
+
+puts "Staging"
+staging.features.each do |feature|
+  pp feature: feature.key, values: feature.gate_values
+end
+puts "Production"
+production.features.each do |feature|
+  pp feature: feature.key, values: feature.gate_values
+end