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Type:
Task
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Resolution: Done
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Affects Version/s: None
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Component/s: None
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None
It doesn't seem possible to
$inc
an element of an array.
class IncTest include Mongoid::Document field :arr, type: Array, default: [0, 0] field :counter, type: Integer, default: 1 end
>> a = IncTest.new => #<IncTest _id: 50a76f83abddc1dfdc000001, _type: nil, arr: [0, 0], counter: 1> # an upsert with $inc of counter ... WORKS >> a.upsert({ '$inc' => { counter: 1 } }) MOPED: 127.0.0.1:27017 UPDATE database=inc_test collection=inc_tests selector={"_id"=>"50a76f83abddc1dfdc000001"} update={"$inc"=>{:counter=>1}, "$set"=>{"arr"=>[0, 0]}} flags=[:upsert] (0.1619ms) => true # an upsert with $inc of an array element ... FAILS >> a.upsert({ '$inc' => { 'arr.0' => 1 } }) MOPED: 127.0.0.1:27017 UPDATE database=inc_test collection=inc_tests selector={"_id"=>"50a76f83abddc1dfdc000001"} update={"$inc"=>{"arr.0"=>1}, "$set"=>{"arr"=>[0, 0], "counter"=>1}} flags=[:upsert] (0.1581ms) => true
As you can see from the MOPED log from the second example, a
$set
of
Unable to find source-code formatter for language: arr```. Available languages are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go, groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc, perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml, yaml
is being appended to the command which clobbers the
$inc
.
I had initially thought this was because the
arr
has a default, but even without that the
$set
still occurs.
For completeness, I'm trying to implement something like this:
javascript
db.inc_tests.update(
, { $inc:
{ counter: 1, 'arr.0': 1, 'arr.1': 1 } }, true)
`