Deep Query Filter

[onwardmk]

I'm trying out a deep query filter and it's not working as I expect.

Here are my resources:

class RideResource < ApplicationResource
  attribute :requested_start_time, :datetime
  attribute :ride_completion_status, :string
  attribute :ride_type, :string

  belongs_to :account
  belongs_to :transport_type
  belongs_to :rider
end

class TransportTypeResource < ApplicationResource
  attribute :name, :string
  attribute :short_name, :string
  attribute :full_name, :string

  has_many :rides
end

Assuming there is no transport type resource with name "test123," I would expect the following request to return no results, but it's returning all the ride resources: /api/v1/rides?include=transport_type&filter[transport_type.name]=test123

Is this a bug or do I need to configure my resources to behave the way I expect? I looked at the documentation and didn't see anything helpful.