[RAILS] Error in production environment (The asset "~" is not present in the asset pipeline.)


I got an error when deploying the original app, so I'll post it so that I can easily resolve it if the same error occurs in the future.

1. Error details

When I checked the published application, the following error screen appeared. Since the cause of the error is not clear from this screen,

スクリーンショット 2021-01-08 21.52.12.png Since the cause of the error is not clear from the screen above, check the error log in the terminal.


heroku logs --tail --app hoge-app-0123

Then, I was able to confirm that there was a problem in the following part. スクリーンショット 2021-01-08 21.46.25.png

What I looked up

Google Translate the error log says "Asset" icon_noimage "does not exist in the asset pipeline. Was translated.

Searching the net because the asset pipeline was unknown → The function to concatenate and compress the files in the assets directory divided into multiple directories and files has appeared. → Does it mean that icon_noimage does not exist and is not connected? ?? ?? Hmm, I don't know ...

Find out more solutions ...

To error resolution

I was able to solve it by changing config.assets.compile in config/envitonments/production.rb from false to true. It seems to be used when the layout collapses in the production environment.


config.assets.compile = true


Even if there is no problem in the local environment, problems may occur in the production environment, so it has been said for a long time to deploy frequently, but I realized the meaning. In addition, I was able to realize that I lacked knowledge of system terms due to this error, so I would like to continue learning.

Reference article

TRANSNET column "Rails beginners can easily trip over the" asset pipeline "" https://www.transnet.ne.jp/2016/02/28/rails%E5%88%9D%E5%AD%A6%E8%80%85%E3%81%8C%E3%81%A4%E3%81%BE%E3%81%9A%E3%81%8Dcolnr%E3%80%8C%E3%82%A2%E3%82%BB%E3%83%83%E3%83%88%E3%83%91%E3%82%A4%E3%83%97%E3%83%A9%E3%82%A4%E3%83%B3/

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