Problems undestanding Mongoid Criteria

here is a simplified version of my models:

class Ticket  include Mongoid::Document  belongs_to :origin, autosave: true  scope :by_tenant, ->(tenant_name) { where("origin.owner": tenant_name) }endclass Origin  include Mongoid::Document  has_many :tickets, dependent: :delete_all  field :owner, type: Stringend

And here is the spec that somehow fails:

describe "#by_tenant" do  let(:origin_one) { create(:origin, owner: "made-up-1") }  let(:origin_two) { create(:origin, owner: "made-up-2") }  before do    create_list(:ticket, 5, origin: origin_one)    create_list(:ticket, 5, origin: origin_two)  end  it "filters by tenant" do    puts described_class.all.count # 10    expect(described_class.by_tenant(origin_one.owner).to_a).to eq(5)  endend

I feel like I'm either misunderstanding how Mongoid Criteria works or I missed something, but that scope should return all tickets that belong to the first origin. What am I doing wrong?