"undefined method `default_render'" with responders and RSpec

[GCorbel]

I have a this simple controller :

module Api
  module V1
    class UsersController < Clearance::UsersController
      respond_to :json

      def create
        respond_with User.create(user_params)
      end

    end
  end
end

And this spec :

require 'rails_helper'

describe "Users API" do
  it 'create a user' do
    post "/api/v1/users.json", user: attributes_for(:user), format: :json

    expect(response).to be_success
    expect(User.count).to eq 1
  end
end

When I run that test, I have this error :

 Failure/Error: get '/api/v1/users'
 NoMethodError:
   undefined method `default_render' for #<Api::V1::UsersController:0x007f5049ab1d78>
 # /usr/local/bundle/gems/responders-2.1.0/lib/action_controller/responder.rb:236:in `default_render'
 # /usr/local/bundle/gems/responders-2.1.0/lib/action_controller/responder.rb:186:in `to_format'
 # /usr/local/bundle/gems/responders-2.1.0/lib/action_controller/responder.rb:163:in `respond'
 # /usr/local/bundle/gems/responders-2.1.0/lib/action_controller/responder.rb:156:in `call'
 # /usr/local/bundle/gems/responders-2.1.0/lib/action_controller/respond_with.rb:203:in `respond_with'
 # ./app/controllers/api/v1/users_controller.rb:7:in `create'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/abstract_controller/base.rb:198:in `process_action'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_controller/metal/rendering.rb:10:in `process_action'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:117:in `call'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:117:in `call'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:505:in `call'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:505:in `call'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:92:in `_run_callbacks'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:776:in `_run_process_action_callbacks'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:81:in `run_callbacks'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/abstract_controller/callbacks.rb:19:in `process_action'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_controller/metal/rescue.rb:29:in `process_action'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/notifications.rb:164:in `block in instrument'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/notifications.rb:164:in `instrument'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
 # /usr/local/bundle/gems/activerecord-4.2.2/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/abstract_controller/base.rb:137:in `process'
 # /usr/local/bundle/gems/actionview-4.2.2/lib/action_view/rendering.rb:30:in `process'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_controller/metal.rb:196:in `dispatch'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_controller/metal.rb:237:in `block in action'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/routing/route_set.rb:74:in `call'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/routing/route_set.rb:74:in `dispatch'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/routing/route_set.rb:43:in `serve'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/journey/router.rb:43:in `block in serve'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/journey/router.rb:30:in `each'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/journey/router.rb:30:in `serve'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/routing/route_set.rb:819:in `call'
 # /usr/local/bundle/gems/rack-1.6.4/lib/rack/etag.rb:24:in `call'
 # /usr/local/bundle/gems/rack-1.6.4/lib/rack/conditionalget.rb:25:in `call'
 # /usr/local/bundle/gems/rack-1.6.4/lib/rack/head.rb:13:in `call'
 # /usr/local/bundle/gems/clearance-1.10.1/lib/clearance/rack_session.rb:10:in `call'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/middleware/params_parser.rb:27:in `call'
 # /usr/local/bundle/gems/activerecord-4.2.2/lib/active_record/query_cache.rb:36:in `call'
 # /usr/local/bundle/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:649:in `call'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:88:in `call'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:88:in `_run_callbacks'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:776:in `_run_call_callbacks'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/callbacks.rb:81:in `run_callbacks'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
 # /usr/local/bundle/gems/railties-4.2.2/lib/rails/rack/logger.rb:38:in `call_app'
 # /usr/local/bundle/gems/railties-4.2.2/lib/rails/rack/logger.rb:20:in `block in call'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/tagged_logging.rb:68:in `block in tagged'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/tagged_logging.rb:26:in `tagged'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/tagged_logging.rb:68:in `tagged'
 # /usr/local/bundle/gems/railties-4.2.2/lib/rails/rack/logger.rb:20:in `call'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/middleware/request_id.rb:21:in `call'
 # /usr/local/bundle/gems/rack-1.6.4/lib/rack/runtime.rb:18:in `call'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/middleware/static.rb:113:in `call'
 # /usr/local/bundle/gems/rack-cors-0.4.0/lib/rack/cors.rb:80:in `call'
 # /usr/local/bundle/gems/railties-4.2.2/lib/rails/engine.rb:518:in `call'
 # /usr/local/bundle/gems/railties-4.2.2/lib/rails/application.rb:164:in `call'
 # /usr/local/bundle/gems/rack-test-0.6.3/lib/rack/mock_session.rb:30:in `request'
 # /usr/local/bundle/gems/rack-test-0.6.3/lib/rack/test.rb:244:in `process_request'
 # /usr/local/bundle/gems/rack-test-0.6.3/lib/rack/test.rb:124:in `request'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/testing/integration.rb:297:in `process'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/testing/integration.rb:32:in `get'
 # /usr/local/bundle/gems/actionpack-4.2.2/lib/action_dispatch/testing/integration.rb:344:in `block (2 levels) in <module:Runner>'
 # ./spec/requests/users_spec.rb:7:in `block (2 levels) in <top (required)>'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/dependencies.rb:268:in `load'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/dependencies.rb:268:in `block in load'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/dependencies.rb:240:in `load_dependency'
 # /usr/local/bundle/gems/activesupport-4.2.2/lib/active_support/dependencies.rb:268:in `load'
 # /usr/local/bundle/gems/spring-commands-rspec-1.0.4/lib/spring/commands/rspec.rb:18:in `call'
 # -e:1:in `<main>'

A suggested in the issue : #179, I added include ActionController::ImplicitRender and I have this error :

 Failure/Error: post "/api/v1/users.json", user: attributes_for(:user)
 NoMethodError:
   undefined method `user_url' for #<Api::V1::UsersController:0x007f504af71268>

At those lines, the responder seems to not respond to to_json.

The action works in development.

I don't know if it's related to rails-api or to responder. Can you help me?

[GCorbel]

I was wrong. The code does not work in development too.

[bf4]

You'll need to include ImplicitRender, I believe