mongoid query caching

Question

Rails\' ActiveRecord has a feature called Query Caching (ActiveRecord::QueryCache) which saves the result of SQL query for the life-span of a request. While I\'m not very fa

Answer 1

OK, Mongoid 4 supports QueryCache middleware.

Just add middleware in application.rb

config.middleware.use "Mongoid::QueryCache::Middleware"

And then profit:

  MOPED: 127.0.0.1:27017 QUERY        database=XXX collection=page_variants selector={"$query"=>{"_id"=>BSON::ObjectId('5564dabb6d61631e21d70000')}, "$orderby"=>{:_id=>1}} flags=[] limit=-1 skip=0 batch_size=nil fields=nil runtime: 0.4397ms
  MOPED: 127.0.0.1:27017 QUERY        database=XXX collection=page_variants selector={"$query"=>{"_id"=>BSON::ObjectId('5564dacf6d61631e21dc0000')}, "$orderby"=>{:_id=>1}} flags=[] limit=-1 skip=0 batch_size=nil fields=nil runtime: 0.4590ms
  QUERY CACHE                         database=XXX collection=page_variants selector={"$query"=>{"_id"=>BSON::ObjectId('5564c9596d61631e21d30000')}, "$orderby"=>{:_id=>1}}
  QUERY CACHE                         database=XXX collection=page_variants selector={"$query"=>{"_id"=>BSON::ObjectId('5564dabb6d61631e21d70000')}, "$orderby"=>{:_id=>1}}

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Source:

Mongoid changelog

https://github.com/mongoid/mongoid/blob/master/CHANGELOG.md#new-features-2

3410 Mongoid now has a query cache that can be used as a middleware in Rack applications. (Arthur Neves)

For Rails:

config.middleware.use(Mongoid::QueryCache::Middleware)