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    <p>The other answer is obviously wrong. Not only mongoid or mongo driver doesn't cache the query, even if mongo would - it still might be on other machine across the network.</p> <p>My solution was to wrap the receive_message in Mongo::Connection. Pros: one definite place Cons: deserialization still takes place</p> <pre><code> require 'mongo' module Mongo class Connection module QueryCache extend ActiveSupport::Concern module InstanceMethods # Enable the selector cache within the block. def cache @query_cache ||= {} old, @query_cache_enabled = @query_cache_enabled, true yield ensure clear_query_cache @query_cache_enabled = old end # Disable the selector cache within the block. def uncached old, @query_cache_enabled = @query_cache_enabled, false yield ensure @query_cache_enabled = old end def clear_query_cache @query_cache.clear end def cache_receive_message(operation, message) @query_cache[operation] ||= {} key = message.to_s.hash log = "[MONGO] CACHE %s" if entry = @query_cache[operation][key] Mongoid.logger.debug log % 'HIT' entry else Mongoid.logger.debug log % 'MISS' @query_cache[operation][key] = yield end end def receive_message_with_cache(operation, message, log_message=nil, socket=nil, command=false) if query_cache_enabled cache_receive_message(operation, message) do receive_message_without_cache(operation, message, log_message, socket, command) end else receive_message_without_cache(operation, message, log_message, socket, command) end end end # module InstanceMethods included do alias_method_chain :receive_message, :cache attr_reader :query_cache, :query_cache_enabled end end # module QueryCache end # class Connection end Mongo::Connection.send(:include, Mongo::Connection::QueryCache) </code></pre>
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    1. POmongoid query caching
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    1. USRoman
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    1. COVery interesting. Could You please provide some usage example?
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      1. USBenjamin Harel
    2. COAs Mongoid 2.4.x has an identity map, you no longer need this.
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      1. USRoman
    3. COIn addition to the identity map, Mongoid also has a query cache built in now: http://mongoid.org/en/mongoid/docs/extras.html#caching
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      1. USBrian Armstrong
 

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