ruby-on-rails - 从 Rails 4 升级到 Rails 5 后，自定义错误处理不再有效

Question

我们使用 config.exceptions_app 将异常路由到客户错误 Controller (描述 here )。这在我们的 Rails 4 应用程序中运行良好，但自从我们升级到 Rails 5 后，此设置不再有效，并且我们在处理函数中收到错误“未定义的局部变量或方法‘env’”。

application.rb

module MyApp
  class Application < Rails::Application

    # Route errors to our custom error controller
    # (See https://coderwall.com/p/w3ghqq)
    config.exceptions_app = lambda do |env|
      ExceptionsController.action(:render_error).call(env)
    end

  end
end

exceptions_controller.rb

class ExceptionsController < BaseController

  def render_error

    @exception = env["action_dispatch.exception"] # RAILS 5 RAISES ERROR HERE: "undefined local variable or method `env'"
    exception_wrapper = ActionDispatch::ExceptionWrapper.new(request.env, @exception)
    @status_code = exception_wrapper.status_code
    trace = exception_wrapper.application_trace

    # Custom notifications and stuff...

  end

end

Answer 1

感谢@zakariah1 的帮助(如果你想发布答案，我会给你信誉)。

事实证明，我必须对 render_error 函数进行一些更改才能使一切正常工作。我在下面发布了 Rails 4 和 Rails 5 版本以供引用:

def render_error

  # --- FOR RAILS 4: ---
  ## @exception = env["action_dispatch.exception"]
  ## exception_wrapper = ActionDispatch::ExceptionWrapper.new(env, @exception)

  # --- FOR RAILS 5: ---
  @exception = request.env["action_dispatch.exception"]
  exception_wrapper = ActionDispatch::ExceptionWrapper.new(request.env['action_dispatch.backtrace_cleaner'], @exception)

  trace = exception_wrapper.application_trace

  # Custom notifications and stuff...

end