param_type body 1xN relation not work

Please look following code (change from lib/example):

require 'grape'
require 'grape-entity'
require '../lib/grape-swagger'

module Entities
  module Some
    class Thing < Grape::Entity
      expose :text, documentation: { type: 'string', desc: 'Content of something.' }
      expose :name, documentation: { type: String, desc: 'Name of something.' }
    end
 end
end

class Api < Grape::API
  format :json
  add_swagger_documentation models: [Entities::Some::Thing]
end

I expect request /swagger_doc/thing.json, will return some useful information.But actually is return me Not Found.

I try to tun rspec with grape-swagger/spec/api_global_models_spec.rb, test passed. But I do not know why above code not works.

I search the issues, the feature created by @chebyte

Start by reproducing the example from lib/example and requesting /swagger_doc/thing.json. Compare its setup with grape-swagger/spec/api_global_models_spec.rb, which currently passes, to locate why the global model is not exposed. Done means the example endpoint returns useful Swagger information instead of Not Found.