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Type:
Task
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Labels:None
I'm trying to get the max on a field over a Criteria, chaining after a #where method. This is definitely expected to work, and is a featured example in the docs.
The query in question (I tried this both with and without regex, and it behaves incorrectly both ways):
account.campaigns.where(name: /Untitled (\d+)/).max(:name)
Without the #max, it properly generates the selector:
MOPED: 127.0.0.1:27017 QUERY database=development collection=
campaigns selector={"account_id"=><BSON::ObjectId:0x70215006872120 data=55831dc2636173383a000000>, "name"=>/Untitled Campaign (\d+)/} flags=[] limit=0 skip=0 batch_size=nil fields=nil runtime: 0.3168ms
With the #max, it changes the selector to an empty $nin selector:
MOPED: 127.0.0.1:27017 COMMAND database=development command={:a
ggregate=>"campaigns", :pipeline=>[{"$match"=>{"account_id"=><BSON::ObjectId:0x70215006872120 data=55831dc2636173383a000000>, "name"=>{"$nin"=>[]}}}, {"$group"=>{"_id"=>"name", "count"=>{"$sum"=>1}, "max"=>{"$max"=>"$name"}, "min"=>{"$min"=>"$name"}, "sum"=>{"$sum"=>"$name"}, "avg"=>{"$avg"=>"$name"}}}]} runtime: 0.3208ms
Instead of returning the max of documents that match the #where condition, it just returns the max for the name field across all documents matching this account_id. I suspect this may have something to do with querying on the same field that I'm attempting to get the max of.
edit: This is with mongoid 4.0.2, moped 2.0.6, origin 2.1.1.