资产 application.css 未声明，但在清单中声明答案

【问题标题】：Asset application.css is not declared but it is declared in manifest资产 application.css 未声明，但在清单中声明
【发布时间】：2018-03-05 14:20:30
【问题描述】：

我收到了这个错误：

ActionView::Template::Error (Asset `application.css` was not declared to be precompiled in production.
Declare links to your assets in `app/assets/config/manifest.js`.

  //= link application.css
and restart your server):

Rails 5.1.4
链轮（4.0.0.beta5、4.0.0.beta4、3.7.1）
链轮导轨（3.2.1、3.2.0、2.3.3）

Manifest.js

//= link_tree ../images

//= link_directory ../javascripts .js

//= link_directory ../stylesheets .css

资产.rb

# Be sure to restart your server when you modify this file.

# Version of your assets, change this if you want to expire all your assets.
Rails.application.config.assets.version = '1.0'

# Add additional assets to the asset load path.
# Rails.application.config.assets.paths << Emoji.images_path
# Add Yarn node_modules folder to the asset load path.
Rails.application.config.assets.paths << Rails.root.join('node_modules')

# Precompile additional assets.
# application.js, application.css, and all non-JS/CSS in the app/assets
# folder are already added.
# Rails.application.config.assets.precompile += %w( admin.js admin.css )

Application.rb

require_relative 'boot'

require "rails"
# Pick the frameworks you want:
require "active_model/railtie"
require "active_job/railtie"
# require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "action_cable/engine"
require "sprockets/railtie"
require "rails/test_unit/railtie"

【问题讨论】：

在 Rails 5.1.7 上也突然得到了这个
刚刚在 Rails 6.0.2.1 上突然出现了这个

标签： sprockets ruby-on-rails-5.1 rails-sprockets

【解决方案1】：

在将 application.css 重命名为 application.scss 后也遇到了这个问题。

修复很简单，只需让您的 manifest.js 文件如下所示：

//= link_tree ../images
//= link application.css

重新启动服务器，希望能修复它。祝你好运。

【讨论】：