Rails 4 asset pipeline vendor asset images are not precompiled

problem ：

I'm using rails 4 & ruby 1.9.3 for my application and fancybox2-rails gem, but there's a general problem with asset pipeline. I use rails 4 and ruby 1.9.3 As my application and fancybox2-rails gem, But there are general problems with asset pipelines .If I run rake task for precompile, then everything is fine except for images in vendor/assets/images and ../gems/ruby-1.9.3-p327/gems/fancybox2-rails-0.2.1/vendor/assets/images . If I run for precompile rake task , So everything's fine , except vendor/assets/images and ../gems/ruby-1.9.3-p327/gems/fancybox2-rails-0.2.1/vendor/assets/images .Images from these two folders are not being precompiled and eventually I have a problem with dead links to non-existing images. Images from these two folders are not precompiled , Finally, I encountered the problem of dead links with non-existent images .Any suggestions? What do you suggest ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/xYhc