Not showing in Rails 4 about rack-mini-profiler HOT 34 CLOSED

Disabling Rack::Deflater in development fixed things for me.

WhateverApp::Application.configure do
  config.middleware.insert_before ActionDispatch::Static, Rack::Deflater
end

Commenting that out and restarting rails s made the profiler work in development on rails 4.2.6 ruby 2.3.1 with the Gemfile-only default setup.

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We were missing the badge, and it turned out it was because we were using heroku_rails_deflate. Using heroku-deflater seems to not break the badge.

The problems seem to occur around

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I think I've tracked my issue down to a log permissions error. I haven't bothered to fix it yet though.

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For me, removing Deflater from config/application.rb and moving it to production fixed the issue.
As suggested here:
http://stackoverflow.com/questions/17025563/how-to-get-mini-profiler-to-start-in-rails

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I didn't have the oj_mimic_json gem, but removing heroku-deflator worked for me.

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This still happens for me unless I remove oj_mimic_json, which I'd like to use.

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I have not seen this reported anywhere else.

Are you seeing JS errors in chrome dev tools?

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No nothing. I just get an empty div:

Could it be because of the bullet gem being present?

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I removed bullet, but it didn't change anything.

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hmmmm I also lost rack mini profiler (in production only) when I swapped from unicorn to puma. I'm not sure what else I changed, but nothing else comes to mind.

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Same here with Rails 4 rails 4.0.0 and ruby 2.0.0p353

As suggested here, doesn't work either http://stackoverflow.com/questions/17025563/how-to-get-mini-profiler-to-start-in-rails

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+1

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I'm having the same issue. Doesn't work in rails 4 for me

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I have the same issue, have tracked it down to having oj_mimic_json in my Gemfile. Anyone else with this issue using the same gem?

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@lnovsak same here. oj_mimic_json breaks it.

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I have same issue. I have oj_mimic_json in my Gemfile. But then i removed it, problem wasn't resolved.

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Same problem here. No error found in Firebug

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+1, removing oj_mimic_json and following what is mentioned about Rack::Deflater in the README solved the problem. The request for /rack-mini-profiler/result would hang the ruby process, also see my comment in #112 regarding SystemStackError

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+1, removing oj_mimic_json works. I don't get hanging of the ruby process though. Hopefully this can be fixed.

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this is all very strange can someone write a test case that fails here, somehow ojs json implementation is lacking and its hurting us here.

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The issue is that OJ doesn't handle circular reference in objects. For example:
Never mind, the normal json parser doesn't handle it either.

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Oj.default_options = {
:mode => :compat,
:use_to_json => true
}

This works for me for circular references

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before any of this can someone help isolate the circular ref, so we can remove it, we don't really need it in our persistence structure.

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I also had to both remove Deflator and oj_mimic_json to get this to work. Ruby 2.2, Rails 4.2.1

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+1 for removing oj_mimic_json gem.

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Just wanted to chime in that I encountered the same issue. I had to remove the oj_mimic_json gem for this to work.

The solution that @pencilcheck suggested didn't work for me.

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Same issue for me. Described more at #134 (comment)

Btw, I do not use oj_mimic_json or heroku_deflator

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@SamSaffron Here is a fresh Rails app (4.2.6 / 2.3.1) where this has been reproduced. https://github.com/steverob/miniprofiler-production-test

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@steverob I ran your test app and was not able to reproduce the problem. The mini profiler showed up just fine on the second request.

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Really? :( let me check again.

Regards
Steve Robinson

On 03-Jul-2016, at 11:25 PM, Dave Gynn [email protected] wrote:

@steverob I ran your test app and was not able to reproduce the problem. The mini profiler showed up just fine on the second request.

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@dgynn yes you're right. Upon second request it shows up. No such luck for my app though. Same environment. Any ideas?

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@dgynn sorry my bad. I did not restart server after adding the authorize_request call :(. Code reloading!!

Thanks.

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Here is a way to get around minprofile in development mode. If you are using the oj gem and not the oj_mimic_json which really is just a small bit of code.

oj-mimic-json-1.0.1 (lib/oj_mimic_json.rb)

require 'oj'

Oj.mimic_JSON()
# Requiring json here seems to stop conflicts when requiring json in other files.
begin
  require 'json'
rescue Exception
  # ignore
end

config/initializers/oj.rb

require 'oj'

Oj.default_options = {
  mode: :compat
}

# Should be able to remove this(Rails.env.development?) once a update comes out
# https://github.com/MiniProfiler/rack-mini-profiler/pull/250
Oj.mimic_JSON unless Rails.env.development?

Basically I am turning off the OJ system in development as it is the only time we are using to try and backtrace slow queries.

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Closing as stale. Linking #16.

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