图像src在heroku上有额外的编号，但是为什么在本地有效？

Question

The Image are shown locally but its cant shown on heroku why?

When i open inspect element it have numbers after the src image like this

<img alt="" src="/assets/slider-1-small-5becce2e5e78cb63c4cdb619548f388c.jpg">

Answer 1

The number that you see in the image name is the fingerprinting, that Rails adds to assets in production environment, to assure, that if you update some asset, it will not be loaded from a browser cache for a user, who already visited your website.

You can read more about it here: http://guides.rubyonrails.org/asset_pipeline.html#what-is-fingerprinting-and-why-should-i-care-questionmark

But i suppose, that the problem that you have, might be related with a config config.serve_static_assets = true in your config/production.rb file. Heroku has a nice article about the Rails 4 deployment and Assets Pipeline in general:

https://devcenter.heroku.com/articles/rails-4-asset-pipeline