I hope this message finds you well.

We're having some issues with Mongoid on JRuby+Puma where the collection associated with a Mongoid model is being changed incorrectly.

The issue presents itself after a few requests. You'll see the hash of attributes from one collection being materialised within the wrong model, so based on the code example below, a Person will show up with a species attribute instead of a name, and vice-versa.

The issue appeared to be exacerbated by the use of includes although this may have been a coincidence.

Some example code to reproduce follows.

 ruby
class Person
  has_many :pets

  field :name
end

class Pet
  belongs_to :person

  field :species
end

50.times do
  Thread.new do
    Person.store_in collection: 'people'
    Pet.store_in collection: 'pets'
  end
end

Person.collection.name # => 'pets'
Pet.collection.name # => 'pets'

Any pointers, or help would be most appreciated. I can provide more information on our exact setup if that helps.