I believe a similar thing is happen with my install of Rails 5.  It appears 
to me that the development environment is attempting to serve assets via 
the pipeline.  For my experiment I use an image_tag to pull down an image. 
 In the first load case the PNG requested is not present in 
app/assets/images.  For the second request I have copied the PNG into 
place.  Below is the console trace:

dave@dave-MacBook:$ rails -v
Rails 5.0.0.beta2

dave@dave-MacBook:$ rails s
=> Booting Puma
=> Rails 5.0.0.beta2 application starting in development on 
http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Puma 2.16.0 starting...
* Min threads: 0, max threads: 16
* Environment: development
* Listening on tcp://localhost:3000

Started GET "/sign_in" for 127.0.0.1 at 2016-03-08 14:58:50 -0800
Processing by UserController#sign_in as HTML
  Rendered user/sign_in_up.html.haml within layouts/application (786.7ms)
  Rendered shared/_header.html.haml (97.8ms)
Completed 200 OK in 938ms (Views: 910.9ms | ActiveRecord: 0.0ms)
Started GET 
"/assets/bootstrap/bootstrap-theme.self-3598a44d4c6ec016d76dc796536975c136b9cbff9e9f22216088b542fa658481.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/bootstrap/bootstrap.self-598365399e6ae8f5a456a189663bac8ef9b8996ace38626328403f280fd63400.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/vendor_manifest.self-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/font-awesome.self-c1a7a80b6536c3397a1a212c9bd22298ae69260ee343d00b60d7f41fa54a59a8.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/search.self-f4ce997ae0874a91dccf3e609f24a0a61e4e51021836329d7e0a519173ce233b.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/shared/main.self-36922b9ab4cde4dd04c7393ca03177e067982525ad494bd05c8a7478c47632b7.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/shared/lesshat.self-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/user.self-8c01dbddb022ddbff9bb74f8baf99e5139bdaee2997404853c6a9d106444bbe5.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/application.self-0e31f1d30f689436ae56e463f6474eb99704af8bbed5fc320a66ac33afb59c2b.css?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/jquery.self-c64a74367bda6ef8b860f19e74df08927ca99d2be2ac934e9e92d5fd361e0da4.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/turbolinks.self-c37727e9bd6b2735da5c311aa83fead54ed0be6cc8bd9a65309e9c5abe2cbfff.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/action_cable.self-5cc84f1a95a47f68c4e64db6ffd98e141a568a28f49b78fa82712f809692630f.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/jquery_ujs.self-d602bdfe68ffc63b9f9cc512872aa3cfff046228a0a36e90dd476e8ef54c1b09.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/cable.self-e475a14c2de96c3e8b6ec198f31d9dce665cb56a1de35233ff6b6e4aed8af083.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/search.self-a8e5021a341c867ddd784bff1c4fbf355ce26dcc93e7c17da4db0d93a686689f.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/channels/search_results.self-62b81ec1b2eb773ca7e98df9f8bc81b48f8c4a9790c5519269f3685d8519b70a.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/user.self-877aef30ae1b040ab8a3aba4e3e309a11d7f2612f44dde450b5c157aa5f95c05.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/bootstrap/bootstrap.self-d0e973a52d36a01036265aeefaf2d1ae3499d2cb231a9be3bd846432daf231de.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/vendor_manifest.self-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/application.self-afe802b04eaf1de2ea762489c83c08aa4c4ff3ff13c21566e43cb710683f5abc.js?body=1"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/logo-128x128-1a26fea2556eb3e28a2e964cfb9c354196bdfc6255f8d275a457c4da2bda3f9a.png"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET "/images/facebook-32x32.png" for 127.0.0.1 at 2016-03-08 
14:58:51 -0800
Started GET 
"/assets/twitter-32x32-4544d620700b86d9096fd28c0cf9696d398938cd1d897d59982a73096ee47657.png"
 
for 127.0.0.1 at 2016-03-08 14:58:51 -0800
Started GET 
"/assets/google-32x32-27128aa0a975258793fbd777417ee89b7dd14f99ec4ca974f6254ed284af8618.png"
 
for 127.0.0.1 at 2016-03-08 14:58:52 -0800

ActionController::RoutingError (No route matches [GET] 
"/images/facebook-32x32.png"):
  actionpack (5.0.0.beta2) 
lib/action_dispatch/middleware/debug_exceptions.rb:53:in `call'
  web-console (3.1.1) lib/web_console/middleware.rb:131:in `call_app'
  web-console (3.1.1) lib/web_console/middleware.rb:28:in `block in call'
  web-console (3.1.1) lib/web_console/middleware.rb:18:in `catch'
  web-console (3.1.1) lib/web_console/middleware.rb:18:in `call'
  actionpack (5.0.0.beta2) 
lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
  railties (5.0.0.beta2) lib/rails/rack/logger.rb:36:in `call_app'
  railties (5.0.0.beta2) lib/rails/rack/logger.rb:24:in `block in call'
  activesupport (5.0.0.beta2) lib/active_support/tagged_logging.rb:70:in 
`block in tagged'
  activesupport (5.0.0.beta2) lib/active_support/tagged_logging.rb:26:in 
`tagged'
  activesupport (5.0.0.beta2) lib/active_support/tagged_logging.rb:70:in 
`tagged'
  railties (5.0.0.beta2) lib/rails/rack/logger.rb:24:in `call'
  actionpack (5.0.0.beta2) 
lib/action_dispatch/middleware/request_id.rb:24:in `call'
  rack (2.0.0.alpha) lib/rack/method_override.rb:22:in `call'
  rack (2.0.0.alpha) lib/rack/runtime.rb:22:in `call'
  activesupport (5.0.0.beta2) 
lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  actionpack (5.0.0.beta2) 
lib/action_dispatch/middleware/load_interlock.rb:13:in `call'
  actionpack (5.0.0.beta2) lib/action_dispatch/middleware/static.rb:136:in 
`call'
  rack (2.0.0.alpha) lib/rack/sendfile.rb:111:in `call'
  railties (5.0.0.beta2) lib/rails/engine.rb:522:in `call'
  puma (2.16.0) lib/puma/server.rb:557:in `handle_request'
  puma (2.16.0) lib/puma/server.rb:404:in `process_client'
  puma (2.16.0) lib/puma/server.rb:270:in `block in run'
  puma (2.16.0) lib/puma/thread_pool.rb:106:in `call'
  puma (2.16.0) lib/puma/thread_pool.rb:106:in `block in spawn_thread'

Started GET "/sign_in" for 127.0.0.1 at 2016-03-08 15:02:11 -0800
Processing by UserController#sign_in as HTML
  Rendered user/sign_in_up.html.haml within layouts/application (80.1ms)
Completed 500 Internal Server Error in 85ms (ActiveRecord: 0.0ms)

ActionView::Template::Error (Asset was not declared to be precompiled in 
production.
Add `Rails.application.config.assets.precompile += %w( facebook-32x32.png 
)` to `config/initializers/assets.rb` and restart your server):
    11: .row
    12: .col-sm-4.col-sm-offset-4.col-xs-12
    13: = link_to(provider[:link],:class => 'btn-grey btn-block 
oauth-link') do
    14: = image_tag(provider[:image],:class => 'oauth-image')
    15: .text-center
    16: = provider[:label]
    17: 
  app/views/user/sign_in_up.html.haml:14:in `block (2 levels) in 
_app_views_user_sign_in_up_html_haml__345370075_101410280'
  app/views/user/sign_in_up.html.haml:13:in `block in 
_app_views_user_sign_in_up_html_haml__345370075_101410280'
  app/views/user/sign_in_up.html.haml:10:in `each'
  app/views/user/sign_in_up.html.haml:10:in 
`_app_views_user_sign_in_up_html_haml__345370075_101410280'
  app/controllers/user_controller.rb:13:in `sign_in'


  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/actionpack-5.0.0.beta2/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
 
(19.1ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/actionpack-5.0.0.beta2/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
 
(6.5ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/actionpack-5.0.0.beta2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
 
(1.5ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/actionpack-5.0.0.beta2/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb
 
within rescues/layout (62.9ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/web-console-3.1.1/lib/web_console/templates/_markup.html.erb
 
(0.6ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/web-console-3.1.1/lib/web_console/templates/_inner_console_markup.html.erb
 
within layouts/inlined_string (0.4ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/web-console-3.1.1/lib/web_console/templates/_prompt_box_markup.html.erb
 
within layouts/inlined_string (0.5ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/web-console-3.1.1/lib/web_console/templates/style.css.erb
 
within layouts/inlined_string (0.5ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/web-console-3.1.1/lib/web_console/templates/console.js.erb
 
within layouts/javascript (34.4ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/web-console-3.1.1/lib/web_console/templates/main.js.erb
 
within layouts/javascript (0.7ms)
  Rendered 
/home/dave/.rvm/gems/ruby-2.2.3@community/gems/web-console-3.1.1/lib/web_console/templates/index.html.erb
 
(61.6ms)


When rails starts is correctly calls out that it is running in development 
mode.  However, the way it is pulling down assets on the first request 
looks very much like the asset pipeline is being used.  And clearly, with 
the second request, when the PNG is correctly placed, suggests that the 
asset pipeline is in use.

I haven't done anything with respect to the asset configuration. 
 Everything is just as 'rails new' generated.  I have noticed there is now 
an app/assets/config/manifest.js file that appears to be similar in nature 
to app/assets/javascripts/application.js but I don't know how to use this 
file.

Dave

On Tuesday, March 8, 2016 at 12:35:24 AM UTC-8, Colin Law wrote:
>
> On 8 March 2016 at 05:14, Donald Ziesig <don...@ziesig.org <javascript:>> 
> wrote: 
> > Hi All! 
> > 
> > Another problem.  I am using Rails 5.0.0.beta3 with a minor javascript 
> file 
> > (115 lines).  I have encountered the following problem several times in 
> the 
> > past two days.  In both earlier cases, I ended up returning to the 
> master 
> > branch and starting over (there were very few changes in those two 
> branches, 
> > I hadn't gotten very far).  Now I have it very close to being finished 
> and I 
> > can't seem to get it to work like it was a few minutes ago. 
>  Unfortunately, 
> > I have not committed my changes frequently enough (dumb, I know) so I 
> will 
> > have to start over again.  (I can copy the edited files out of the git 
> tree, 
> > create a new branch and copy them back, but I would like to get to the 
> > bottom of this weirdness before I do), 
> > 
> > I am working in development mode.  I can edit and test the .js.erb file 
> in 
> > assets with no problems for hours on end.  Most of the time I don't even 
> > have to restart the server (usually when I edit routes.rb). 
> > 
> > Suddenly, it gives me an error message about needing to pre-compile the 
> js 
> > file in production mode by editing a config file and restarting. 
>
> Can you copy/paste the full error message please.  I have seen errors 
> like this where the message is a bit confusing. 
>
> Also it would be worth comparing the logs before and after it fails to 
> see what the difference is. 
>
> Colin 
>
> >    Without 
> > changing the config (as it recommends) when I restart the app it no 
> longer 
> > loads the javascript file, and none of the routines in it execute 
> anymore. 
> > It also ignores any edits that I make to that file.  In one of the 
> earlier 
> > cases I did edit the config file as it requested, but that did nothing 
> to 
> > solve the problem. 
> > 
> > I don't have any idea what I might have changed to cause this.  I looked 
> at 
> > the git status and I have only changed/created four files: 
> > 
> > 1) The layout file that originally had the js code (was moved to the 
> newly 
> > created js.erb file) 
> > 2) The controller file 
> > 3) The routes.rb file, and 
> > 4) The newly created js.erb file. 
> > 
> > The last edit was to correct a typo in the js.erb file. 
> > 
> > The program works (loads the js from the layout file and does everything 
> > that is already coded) when I switch back to the master branch, but as 
> soon 
> > as I go to the working branch, the problem comes back. 
> > 
> > The rails log seems to show it loading pre-compiled scripts after it 
> breaks, 
> > while before it seems to be getting files from the assets directory. 
>  (Not 
> > sure about this). 
> > 
> > I tried both Firefox and Chrome and both show the same behavior (not 
> > surprising). 
> > 
> > I double checked that RAILS_ENV=development and it is.  This has been 
> setup 
> > for years and only changes when I explicitly set it to production 
> (rarely). 
> > It returns to development whenever I login. 
> > 
> > Where should I start looking for this problem? 
> > 
> > Thanks, 
> > 
> > Don 
> > 
> > 
> > -- 
> > You received this message because you are subscribed to the Google 
> Groups 
> > "Ruby on Rails: Talk" group. 
> > To unsubscribe from this group and stop receiving emails from it, send 
> an 
> > email to rubyonrails-ta...@googlegroups.com <javascript:>. 
> > To post to this group, send email to rubyonra...@googlegroups.com 
> <javascript:>. 
> > To view this discussion on the web visit 
> > 
> https://groups.google.com/d/msgid/rubyonrails-talk/56DE5FC6.8050506%40ziesig.org.
>  
>
> > For more options, visit https://groups.google.com/d/optout. 
>

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