I am new to Rails.When I was deploying app to heroku,terminal showed such informations:
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: I, [2017-05-10T05:03:15.348460 #1268] INFO -- : Writing /tmp/build_6d070dbb68ed231a9980e7d6aee4630f/public/assets/fore- 1ea7b4ae84fb4d285d3da11143e3367c41cf15e8e44b9dba475b4b572fc7ae74.png
remote: I, [2017-05-10T05:03:15.370482 #1268] INFO -- : Writing /tmp/build_6d070dbb68ed231a9980e7d6aee4630f/public/assets/subdirectory/image-B-f3b8e56853071297fbe1da778049948f40f87756705420a97a157e9cf8a477be.jpg
...
remote: Asset precompilation completed (12.71s)
remote: Cleaning assets
remote: Running: rake assets:clean
We saw that the app/assets/ has been precompiled, including images and subdirectory. But when I open the website on heroku, all the images under app/assets/ failed.
To solve this, I ran RAILS_ENV=production rake assets:precompile, check in git, push again. Then the images showed the right way.
My quesiton is:
Why rails clean assets after assets precompilation completed(see the end of the information).I didn't change any default configuration. Does this only happen in heroku?
Must I run precompile locally before deploying? Every time?
config.assets.compile = true
Run following commands:
RAILS_ENV=production rake assets:precompile
then push all files & manifest file to heroku.