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dchentech/mongoid_mapreduce_unknown_out_specifier_db.rb

Created February 20, 2012 06:24
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mongoid运行mapreduce出现unknown out specifier [db]错误
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mongoid_mapreduce_unknown_out_specifier_db.rb
错误信息：Database command 'mapreduce' failed: (assertion: 'unknown out specifier [db]'; assertionCode: '13522'; errmsg: 'db assertion failure'; ok: '0.0').
解决方案：设置out现象里的db参数应该是一个字符串键，比如{"db" => "mapreduce_db", :replace => "tmp_mapreduce"}
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