Details
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Task
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Status: Closed
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Resolution: Done
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None
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None
Description
I've ran into an odd bug related to $addToSet on has_and_belongs_to_many model_ids field. When I try to add an id to the field using {{Model.update "$addToSet" =>
{model_ids: id}}} Mongoid inserts [id] - a single element array instead of just id. This also happens with update_all, but not with add_to_set :model_ids, id call. It does not happen when the field is simply defined as an Array type instead of many-to-many relation (field :model_ids, type: Array). Here's a short test script.
#!/usr/bin/env ruby
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require 'mongoid'
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Mongoid.configure do |config|
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config.connect_to "mongoid_test"
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end
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Moped.logger = Logger.new(STDOUT)
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class Tag
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include Mongoid::Document
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end
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class A
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include Mongoid::Document
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end
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def test_add_to_set value
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@a ||= A.create
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puts "\n\n"
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A.where(_id: @a.id).update_all('$addToSet' => {tag_ids: value})
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@a.reload
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puts "======= Last id: #{@a.tag_ids.last.inspect}"
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puts "======= Error!" if @a.tag_ids.last.kind_of? Array
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end
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test_add_to_set 1
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class A
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has_and_belongs_to_many :tags, inverse_of: nil
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end
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test_add_to_set 2
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And here's the output:
MOPED: 127.0.0.1:27017 INSERT database=mongoid_test collection=as documents=[{"_id"=>"52305e0266d9f1e3f6000001"}] flags=[] (0.1080ms)
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MOPED: 127.0.0.1:27017 UPDATE database=mongoid_test collection=as selector={"_id"=>"52305e0266d9f1e3f6000001"} update={"$addToSet"=>{:tag_ids=>1}} flags=[:multi] (0.1230ms)
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MOPED: 127.0.0.1:27017 QUERY database=mongoid_test collection=as selector={:_id=>"52305e0266d9f1e3f6000001"} flags=[] limit=-1 skip=0 batch_size=nil fields=nil (4.4219ms)
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======= Last id: 1
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MOPED: 127.0.0.1:27017 UPDATE database=mongoid_test collection=as selector={"_id"=>"52305e0266d9f1e3f6000001"} update={"$addToSet"=>{:tag_ids=>[2]}} flags=[:multi] (0.1390ms)
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MOPED: 127.0.0.1:27017 QUERY database=mongoid_test collection=as selector={:_id=>"52305e0266d9f1e3f6000001"} flags=[] limit=-1 skip=0 batch_size=nil fields=nil (0.3378ms)
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======= Last id: [2]
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======= Error!
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