ruby on rails - failed with error 10068: "invalid operator: $oid"

Question

just updated to the latest version of mongoid (3.1.0) and sidekiq (2.7.2)
now i'm getting the error : failed with error 10068: "invalid operator: $oid"
from looking into the code i see a select like that: @selector={"_id"=>{"$oid"=>"[some id]"}}
what can get wrong here?

Answer 1

adding this to my gemfile fixed the issue:

gem 'multi_json', '1.5.1'

i guess something is wrong with the latest version (1.6.0)

EDIT: the gem has been updated to new version (1.6.1) that fixed this issue. more here: https://github.com/intridea/multi_json/issues/89