require 'active_support/core_ext/object/blank' module ActiveRecord # = Active Record Query Cache class QueryCache module ClassMethods # Enable the query cache within the block if Active Record is configured. def cache(&block) if ActiveRecord::Base.connected? connection.cache(&block) else yield end end # Disable the query cache within the block if Active Record is configured. def uncached(&block) if ActiveRecord::Base.connected? connection.uncached(&block) else yield end end end def initialize(app) @app = app end class BodyProxy # :nodoc: def initialize(original_cache_value, target, connection_id) @original_cache_value = original_cache_value @target = target @connection_id = connection_id end def method_missing(method_sym, *arguments, &block) @target.send(method_sym, *arguments, &block) end def respond_to?(method_sym, include_private = false) super || @target.respond_to?(method_sym) end def each(&block) @target.each(&block) end def close @target.close if @target.respond_to?(:close) ensure ActiveRecord::Base.connection_id = @connection_id ActiveRecord::Base.connection.clear_query_cache unless @original_cache_value ActiveRecord::Base.connection.disable_query_cache! end end end def call(env) old = ActiveRecord::Base.connection.query_cache_enabled ActiveRecord::Base.connection.enable_query_cache! status, headers, body = @app.call(env) [status, headers, BodyProxy.new(old, body, ActiveRecord::Base.connection_id)] rescue Exception => e ActiveRecord::Base.connection.clear_query_cache unless old ActiveRecord::Base.connection.disable_query_cache! end raise e end end end