gem 'gaffe' 异常页面美化

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参考链接：https://github.com/mirego/gaffe

step1. gem ‘gaffe’

step2. bundle install

step3. 在 config/initializers/gaffe.rb 中写入

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# config/initializers/gaffe.rb
Gaffe.configure do |config|
  config.errors_controller = 'ErrorsController'
end
Gaffe.enable!

step4. 创建ErrorsController

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class ErrorsController < ApplicationController
  include Gaffe::Errors
  # Make sure anonymous users can see the page
  skip_before_action :authenticate_user!
  # Override 'error' layout
  layout 'application'
  # Render the correct template based on the exception “standard” code.
  # Eg. For a 404 error, the `errors/not_found` template will be rendered.
  def show
    # Here, the `@exception` variable contains the original raised error
    render "errors/#{@rescue_response}", status: @status_code
  end
end

step5. 创建自己的（也可以用它默认的），目录为views/errors/not_found.erb 这种。如下图是这个gem的文件，我们可以覆盖：

step6. 修改config/environments/development.rb，可以看到报错的页面都会给特定的页面，比如404.erb等，但是在开发或者测试环境还是不要设置，因为错误信息看不到，我们自己不好看错误。(Rails prefers to render its own debug-friendly errors in the development environment, which is totally understandable. However, if you want to test Gaffe’s behavior in development you’ll have to edit the config/environments/development.rb file.)

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# Make Rails use `exceptions_app` in development
config.consider_all_requests_local = false

测试环境可以这样干：
config/environments/test.rb

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# Make Rails use `exceptions_app` in tests
config.consider_all_requests_local = false
# Render exceptions instead of raising them
config.action_dispatch.show_exceptions = true