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Type:
Bug
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Resolution: Done
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Priority:
Minor - P4
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Affects Version/s: 2.1.2, 2.2.2
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Component/s: None
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Labels:None
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Environment:MongoDB 2.6
A bulk write with several `update_one(x,
{upsert: true})` operations returns a Mongo::BulkWrite::Result with incorrect counts for n_matched and n_upserted. Additionally, there's no public accessor for "n".
For example, the following reply and result. Note that n_upserted=1 when two documents were upserted, and n_matched=0 when n_modified=1 and n=3.
[39] pry(#<Mongo::Operation::Write::Bulk::Update::Result>)> @replies
=> [#<Mongo::Protocol::Reply:0x007f813268e470
@cursor_id=0,
@documents=
[{"ok"=>1,
"nModified"=>1,
"n"=>3,
"upserted"=>[{"index"=>0, "_id"=>BSON::ObjectId('56bdf71d72175b828791f84e')}, {"index"=>2, "_id"=>BSON::ObjectId('56bdf71d72175b828791f84f')}]}],
@flags=[:await_capable],
@number_returned=1,
@starting_from=0,
@upconverter=
#<Mongo::Protocol::Reply::Upconverter:0x007f8134adb530
@cursor_id=0,
@documents=
[{"ok"=>1,
"nModified"=>1,
"n"=>3,
"upserted"=>[{"index"=>0, "_id"=>BSON::ObjectId('56bdf71d72175b828791f84e')}, {"index"=>2, "_id"=>BSON::ObjectId('56bdf71d72175b828791f84f')}]}],
@starting_from=0>>]
Result:
#<Mongo::BulkWrite::Result:0x007f812dc59d28 @results={"n_modified"=>1, "n_upserted"=>1, "n_matched"=>0, "n"=>3, "upserted_ids"=>[BSON::ObjectId('56bdf71d72175b828791f84e'), BSON::ObjectId('56bdf71d72175b828791f84f')]}>
Example BulkWrite operation:
[11] pry(#<Mongo::BulkWrite::OrderedCombiner>)> requests
=> [{:update_one=>
{:filter=>
{:changed_id=>"c0996128-d19a-11e5-a331-80e650068d94",
:timestamp=>{"$lte"=>1000}},
:update=>
{"$set"=>{:timestamp=>1000},
:upsert=>true}},
{:update_one=>
{:filter=>
{:changed_id=>"c0996128-d19a-11e5-a331-80e650068d94",
:timestamp=>{"$lte"=>2000}},
:update=>
{"$set"=>{:timestamp=>2000},
:upsert=>true}},
{:update_one=>
{:filter=>
{:changed_id=>"c09e3810-d19a-11e5-a331-80e650068d94",
:timestamp=>{"$lte"=>3000}},
:update=>
{"$set"=>{:timestamp=>3000},
:upsert=>true}}]
If I understand correctly, the responsible methods are:
From: /usr/local/var/rbenv/versions/2.0.0-p645/lib/ruby/gems/2.0.0/gems/mongo-2.1.2/lib/mongo/operation/write/bulk/update/result.rb @ line 47 Mongo::Operation::Write::Bulk::Update::Result#n_upserted:
45: def n_upserted
46: return 0 unless acknowledged?
=> 47: @replies.reduce(0) do |n, reply|
48: if upsert?(reply)
49: n += 1
50: else
51: n += 0
52: end
53: end
54: end
From: /usr/local/var/rbenv/versions/2.0.0-p645/lib/ruby/gems/2.0.0/gems/mongo-2.1.2/lib/mongo/operation/write/bulk/update/result.rb @ line 65 Mongo::Operation::Write::Bulk::Update::Result#n_matched:
64: def n_matched
65: return 0 unless acknowledged?
=> 66: @replies.reduce(0) do |n, reply|
67: if upsert?(reply)
68: n += 0
69: else
70: n += reply.documents.first[N]
71: end
72: end
73: end