I use Mongoid 3.0.13.
My model is as below

class Foo
  include Mongoid::Document
  field :name, type: String, localize: true
  field :category
  
  validates :name, uniqueness: { scope: :category, case_sensitive: false }
end

But the uniqueness validation is ignored.

Either without localize or modify the validation to

 validates :name, uniqueness: true 

, the validation will work. But I need the validation work with scope and localize.

Any suggestion? Thanks.