replace-string-across-all-objects.rb

def all_models
  Rails.application.eager_load!
  ActiveRecord::Base.descendants
end

def replace_string_across_all_objects(old, new)
  all_models().each do |model|
    print "Checking #{model} models\n"
    model.all.each do |o|
      o.attributes.each_pair do |name, value|
        begin
          if value.index(old) != nil
            print "Updating field #{name} of #{model} id #{o.id}\n"
            o[name] = value.sub old, new
            o.save
          end
        rescue NoMethodError
        end
      end
    end
  end
end

if ARGV.length == 3
  replace_string_across_all_objects(ARGV[1], ARGV[2])
else
  print "Usage: #{ARGV[0]} <search> <replace>\n"
end