Issue with Rails panel - ruby-on-rails

Question

I am using the chrome extension Rails Panel in my Rails application. But it's not working properly.
Gemfile
group :development do
gem 'therubyracer', :platforms => :ruby
gem 'better_errors'
gem 'binding_of_caller'
gem 'meta_request'
end
Development log:
Errno::ENOENT - No such file or directory - /home/rahulv/sprint/S33/tmp/data/meta_request/d927421bce3c90bc465c9ceb894813ca.json:
meta_request (0.3.4) lib/meta_request/storage.rb:16:in `read'
meta_request (0.3.4) lib/meta_request/middlewares/meta_request_handler.rb:20:in `events_json'
meta_request (0.3.4) lib/meta_request/middlewares/meta_request_handler.rb:11:in `call'
pdfkit (0.5.4) lib/pdfkit/middleware.rb:16:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.5) lib/rack/etag.rb:23:in `call'
rack (1.4.5) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.16) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.16) lib/active_support/callbacks.rb:405:in `_run__572592932466143201__call__1542018980761186849__callbacks'
activesupport (3.2.16) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.16) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.16) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.16) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
better_errors (2.1.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
better_errors (2.1.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
better_errors (2.1.0) lib/better_errors/middleware.rb:57:in `call'
rack-contrib (1.2.0) lib/rack/contrib/response_headers.rb:17:in `call'
meta_request (0.3.4) lib/meta_request/middlewares/headers.rb:16:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.16) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.16) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.16) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.16) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.16) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.5) lib/rack/lock.rb:15:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/static.rb:63:in `call'
railties (3.2.16) lib/rails/engine.rb:484:in `call'
railties (3.2.16) lib/rails/application.rb:231:in `call'
rack (1.4.5) lib/rack/content_length.rb:14:in `call'
railties (3.2.16) lib/rails/rack/log_tailer.rb:17:in `call'
thin (1.5.1) lib/thin/connection.rb:81:in `block in pre_process'
thin (1.5.1) lib/thin/connection.rb:79:in `pre_process'
thin (1.5.1) lib/thin/connection.rb:54:in `process'
thin (1.5.1) lib/thin/connection.rb:39:in `receive_data'
eventmachine (1.0.3) lib/eventmachine.rb:187:in `run'
thin (1.5.1) lib/thin/backends/base.rb:63:in `start'
thin (1.5.1) lib/thin/server.rb:159:in `start'
rack (1.4.5) lib/rack/handler/thin.rb:13:in `run'
rack (1.4.5) lib/rack/server.rb:268:in `start'
railties (3.2.16) lib/rails/commands/server.rb:70:in `start'
railties (3.2.16) lib/rails/commands.rb:55:in `block in <top (required)>'
railties (3.2.16) lib/rails/commands.rb:50:in `<top (required)>'
script/rails:6:in `<main>'
What seems to be the issue?

Answer 1

I have solved the issue by following these steps:
Remove the meta_request folder inside/tmp/data/
Restart the server using rails s
Now everything works fine :)

Answer 2

As RailsPanel is a great tool, keep using it with the meta_request gem creating a Rails initializer in the file config/initializers/meta_request.rb with the below code:
if defined?(MetaRequest) && MetaRequest::Event.private_instance_methods(false).exclude?(:not_encodable?)
MetaRequest::Event.class_eval do
private
def json_encodable(payload)
return {} unless payload.is_a?(Hash)
transform_hash(payload, deep: true) do |hash, key, value|
if value.class.to_s == 'ActionDispatch::Http::Headers'
value = value.to_h.select { |k, _| k.upcase == k }
elsif not_encodable?(value)
value = self.class.const_get(:NOT_JSON_ENCODABLE)
end
begin
value.to_json(methods: [:duration])
new_value = value
rescue StandardError
new_value = self.class.const_get(:NOT_JSON_ENCODABLE)
end
hash[key] = new_value
end.with_indifferent_access
end
def not_encodable?(value)
(defined?(ActiveRecord) && value.is_a?(ActiveRecord::ConnectionAdapters::AbstractAdapter)) ||
(defined?(ActionDispatch) &&
(value.is_a?(ActionDispatch::Request) || value.is_a?(ActionDispatch::Response)))
end
end
end
Reference: https://github.com/dejan/rails_panel/pull/177#issuecomment-797378347