undefined method `[]=' for nil:NilClass

[Valentin-LG]

Hello,

I have updated grape from 0.19.2 to 1.2.3 and grape-swagger from 0.25.3 to 0.32.1 and now I got a 500 error undefined method []= for nil::NilClass.

Can anyone help me please ? ^^"

here is the full backtrace :

`NoMethodError at /0.1/swagger_doc

undefined method `[]=' for nil:NilClass

app/api/api_cors.rb, line 25

   20       @app = app
   21     end
   22   
   23     def call(env)
   24       if env['REQUEST_METHOD'] != 'OPTIONS'
>  25         @app.call(env)
   26       else
   27         Rack::Response.new([nil], 204)
   28       end
   29     end
   30   end

App backtrace

• app/api/api_cors.rb:25:in `call'
• app/api/api_logger.rb:33:in `block in call'
• app/api/api_logger.rb:32:in `call'
• app/middleware/reseller_by_host.rb:26:in `call'

Full backtrace

• grape-swagger (0.32.1) lib/grape-swagger/endpoint.rb:251:in `success_codes_from_route'
• grape-swagger (0.32.1) lib/grape-swagger/endpoint.rb:236:in `http_codes_from_route'
• grape-swagger (0.32.1) lib/grape-swagger/endpoint.rb:198:in `response_object'
• grape-swagger (0.32.1) lib/grape-swagger/endpoint.rb:124:in `method_object'
• grape-swagger (0.32.1) lib/grape-swagger/endpoint.rb:104:in `block in path_item'
• grape-swagger (0.32.1) lib/grape-swagger/endpoint.rb:98:in `path_item'
• grape-swagger (0.32.1) lib/grape-swagger/endpoint.rb:83:in `block in path_and_definition_objects'
• grape-swagger (0.32.1) lib/grape-swagger/endpoint.rb:81:in `path_and_definition_objects'
• grape-swagger (0.32.1) lib/grape-swagger/doc_methods.rb:57:in `block in setup'
• grape-swagger (0.32.1) lib/grape-swagger/doc_methods.rb:71:in `block in setup'
• grape (1.2.3) lib/grape/endpoint.rb:57:in `block (2 levels) in generate_api_method'
• activesupport (4.2.11) lib/active_support/notifications.rb:166:in `instrument'
• grape (1.2.3) lib/grape/endpoint.rb:56:in `block in generate_api_method'
• grape (1.2.3) lib/grape/endpoint.rb:263:in `block in run'
• activesupport (4.2.11) lib/active_support/notifications.rb:166:in `instrument'
• grape (1.2.3) lib/grape/endpoint.rb:243:in `run'
• grape (1.2.3) lib/grape/endpoint.rb:314:in `block in build_stack'
• grape (1.2.3) lib/grape/middleware/base.rb:31:in `call!'
• grape (1.2.3) lib/grape/middleware/base.rb:24:in `call'
• grape (1.2.3) lib/grape/middleware/base.rb:31:in `call!'
• grape (1.2.3) lib/grape/middleware/base.rb:24:in `call'
• grape (1.2.3) lib/grape/middleware/error.rb:38:in `block in call!'
• grape (1.2.3) lib/grape/middleware/error.rb:37:in `call!'
• grape (1.2.3) lib/grape/middleware/base.rb:24:in `call'
• rack (1.6.11) lib/rack/head.rb:13:in `call'
• grape (1.2.3) lib/grape/endpoint.rb:227:in `call!'
• grape (1.2.3) lib/grape/endpoint.rb:221:in `call'
• grape (1.2.3) lib/grape/router/route.rb:72:in `exec'
• grape (1.2.3) lib/grape/router.rb:121:in `process_route'
• grape (1.2.3) lib/grape/router.rb:74:in `block in identity'
• grape (1.2.3) lib/grape/router.rb:93:in `transaction'
• grape (1.2.3) lib/grape/router.rb:72:in `identity'
• grape (1.2.3) lib/grape/router.rb:57:in `block in call'
• grape (1.2.3) lib/grape/router.rb:137:in `with_optimization'
• grape (1.2.3) lib/grape/router.rb:56:in `call'
• grape (1.2.3) lib/grape/api/instance.rb:131:in `call'
• grape (1.2.3) lib/grape/api/instance.rb:57:in `call!'
• grape (1.2.3) lib/grape/api/instance.rb:52:in `call'
• grape (1.2.3) lib/grape/api.rb:51:in `call'
• app/api/api_cors.rb:25:in `call'
• app/api/api_logger.rb:33:in `block in call'
• activesupport (4.2.11) lib/active_support/notifications.rb:164:in `block in instrument'
• activesupport (4.2.11) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
• activesupport (4.2.11) lib/active_support/notifications.rb:164:in `instrument'
• app/api/api_logger.rb:32:in `call'
• rack (1.6.11) lib/rack/builder.rb:153:in `call'
• actionpack (4.2.11) lib/action_dispatch/routing/mapper.rb:51:in `serve'
• actionpack (4.2.11) lib/action_dispatch/journey/router.rb:43:in `block in serve'
• actionpack (4.2.11) lib/action_dispatch/journey/router.rb:30:in `serve'
• actionpack (4.2.11) lib/action_dispatch/routing/route_set.rb:817:in `call'
• browser (2.5.3) lib/browser/middleware.rb:54:in `run_app'
• browser (2.5.3) lib/browser/middleware.rb:34:in `call'
• http_accept_language (2.1.1) lib/http_accept_language/middleware.rb:14:in `call'
• bullet (5.9.0) lib/bullet/rack.rb:12:in `call'
• app/middleware/reseller_by_host.rb:26:in `call'
• rack-cors (1.0.2) lib/rack/cors.rb:97:in `call'
• rack (1.6.11) lib/rack/config.rb:17:in `call'
• warden (1.2.7) lib/warden/manager.rb:36:in `block in call'
• warden (1.2.7) lib/warden/manager.rb:35:in `call'
• rack (1.6.11) lib/rack/etag.rb:24:in `call'
• rack (1.6.11) lib/rack/conditionalget.rb:25:in `call'
• rack (1.6.11) lib/rack/head.rb:13:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/flash.rb:260:in `call'
• rack (1.6.11) lib/rack/session/abstract/id.rb:225:in `context'
• rack (1.6.11) lib/rack/session/abstract/id.rb:220:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/cookies.rb:560:in `call'
• activerecord (4.2.11) lib/active_record/query_cache.rb:36:in `call'
• activerecord (4.2.11) lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
• activerecord (4.2.11) lib/active_record/migration.rb:377:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
• activesupport (4.2.11) lib/active_support/callbacks.rb:88:in `run_callbacks'
• activesupport (4.2.11) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
• activesupport (4.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks'
• actionpack (4.2.11) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/reloader.rb:73:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
• better_errors (2.5.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
• better_errors (2.5.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
• better_errors (2.5.0) lib/better_errors/middleware.rb:57:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
• web-console (2.3.0) lib/web_console/middleware.rb:28:in `block in call'
• web-console (2.3.0) lib/web_console/middleware.rb:18:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
• lograge (0.10.0) lib/lograge/rails_ext/rack/logger.rb:15:in `call_app'
• railties (4.2.11) lib/rails/rack/logger.rb:20:in `block in call'
• activesupport (4.2.11) lib/active_support/tagged_logging.rb:68:in `block in tagged'
• activesupport (4.2.11) lib/active_support/tagged_logging.rb:26:in `tagged'
• activesupport (4.2.11) lib/active_support/tagged_logging.rb:68:in `tagged'
• railties (4.2.11) lib/rails/rack/logger.rb:20:in `call'
• request_store (1.4.1) lib/request_store/middleware.rb:19:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/request_id.rb:21:in `call'
• rack (1.6.11) lib/rack/methodoverride.rb:22:in `call'
• rack (1.6.11) lib/rack/runtime.rb:18:in `call'
• activesupport (4.2.11) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
• rack (1.6.11) lib/rack/lock.rb:17:in `call'
• actionpack (4.2.11) lib/action_dispatch/middleware/static.rb:120:in `call'
• rack (1.6.11) lib/rack/sendfile.rb:113:in `call'
• railties (4.2.11) lib/rails/engine.rb:518:in `call'
• railties (4.2.11) lib/rails/application.rb:165:in `call'
• rack (1.6.11) lib/rack/deflater.rb:35:in `call'
• rack (1.6.11) lib/rack/content_length.rb:15:in `call'
• puma (3.12.0) lib/puma/configuration.rb:225:in `call'
• puma (3.12.0) lib/puma/server.rb:658:in `handle_request'
• puma (3.12.0) lib/puma/server.rb:472:in `process_client'
• puma (3.12.0) lib/puma/server.rb:332:in `block in run'
• puma (3.12.0) lib/puma/thread_pool.rb:133:in block in spawn_thread'
  In my application.rb, i have Rack::cors enabled like this :

config.middleware.insert_before 0, 'Rack::Cors' do
    allow do
      origins '*'
      resource '/api-web/0.1/*', headers: :any, methods: [:get, :post, :options, :put, :delete, :patch]
      resource '/api/0.1/*', headers: :any, methods: [:get, :post, :options, :put, :delete, :patch]
    end
end
config.middleware.use ::ResellerByHost

[codemnkey]

+1

[LeFnord]

please submit a spec, which re-produces this behaviour, so someone (maybe you) can take it over to fix it

[Valentin-LG]

Hello,

Here is the repo :

https://github.com/Lalensia/mapotempo-web/tree/update_swagger

And there is the commit that update grape and swagger :

https://github.com/Lalensia/mapotempo-web/commit/22de6245dc63d4d5ee663ece3b49e925507f3b8f

[Valentin-LG]

Well, after many hours searching for solution, i came to the conclusion that I have no solution ^^", I just don't understand why :/

[pisaq]

I've made that and it worked
gem 'grape-swagger', git: 'https://github.com/fotos/grape-swagger', branch: 'fix-array-handling'

[LeFnord]

Hi @pisaq … would be nice, if open an PR, so it can be included … thanks

[pisaq]

@LeFnord but there already is one :P
#742

[LeFnord]

ah sorry, wasn't clear, that one exists

[LeFnord]

will have a look on it today

[pisaq]

@fotos ;)
Cheers !

[fotos]

👋 @pisaq and thanks for the mention.

I'm not really sure how my branch fixes the problem mentioned here. Nevertheless I'll certainly have a look tomorrow. 👀 If this is the case, then I'm glad we have a 2nd project to confirm the issue and increase our confidence on the fix.

In any case I'd certainly appreciate some feedback on #742.

[LeFnord]

yeah, I remember … and sorry for no commenting

it seems the ruby-grape/grape#1863 isn't related to it …
so we can cut a new release upgraded dependencies, and have to drop the support for older grape version, for that we have to to do

• adding an entry in UPGRADE.md → how to migrate, and what (can be) break
• update travis-ci, to reflect the dependency changes
• updating the version matrix in README.md