在 Rails 4 中救援来自 ActionController::RoutingError

问题描述

我遇到以下错误:

ActionController::RoutingError (No route matches [GET] "/images/favicon.ico")

我想为不存在的链接显示 error404 页面.

I want to show error404 page for links that are not existing.

我怎样才能做到这一点?

How can I achieve that?

推荐答案

在application_controller.rb中添加以下内容:

  # You want to get exceptions in development, but not in production.
  unless Rails.application.config.consider_all_requests_local
    rescue_from ActionController::RoutingError, with: -> { render_404  }
  end

  def render_404
    respond_to do |format|
      format.html { render template: 'errors/not_found', status: 404 }
      format.all { render nothing: true, status: 404 }
    end
  end

我通常也会挽救以下异常，但这取决于你:

I usually also rescue following exceptions, but that's up to you:

rescue_from ActionController::UnknownController, with: -> { render_404  }
rescue_from ActiveRecord::RecordNotFound,        with: -> { render_404  }

创建错误控制器:

class ErrorsController < ApplicationController
  def error_404
    render 'errors/not_found'
  end
end

然后在routes.rb

  unless Rails.application.config.consider_all_requests_local
    # having created corresponding controller and action
    get '*path', to: 'errors#error_404', via: :all
  end

最后一件事是在 /views/errors/ 下创建 not_found.html.haml(或您使用的任何模板引擎):

And the last thing is to create not_found.html.haml (or whatever template engine you use) under /views/errors/:

  %span 404
  %br
  Page Not Found

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