# File lib/mongo_mapper/middleware/identity_map.rb, line 32
      def call(env)
        MongoMapper::Plugins::IdentityMap.clear
        enabled = MongoMapper::Plugins::IdentityMap.enabled
        MongoMapper::Plugins::IdentityMap.enabled = true
        status, headers, body = @app.call(env)
        [status, headers, Body.new(body, enabled)]
      end