Ruby-on-rails 如何在 Rails 模型中获取 request.uri？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6307138/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do i get request.uri in model in Rails?
提问by Sreeraj
$request = request
When I write this in controller, it will work. But if i need this variable in Model or Application controller, How can i ?
当我在控制器中写这个时，它会起作用。但是如果我在模型或应用程序控制器中需要这个变量，我该怎么做？
回答by DGM
Models exist outside the context of a web request. You can instantiate them in irb, you can instantiate them in a delayed job, or a script, etc. If the model depended on the request object, none of these things would be possible.
模型存在于 Web 请求的上下文之外。您可以在 irb 中实例化它们，也可以在延迟作业或脚本等中实例化它们。如果模型依赖于请求对象，那么这些事情都不可能实现。
As tsdbrown says, you have to somehow pass in that information from the context that uses the model.
正如 tsdbrown 所说，您必须以某种方式从使用模型的上下文中传递该信息。
回答by Sreeraj
I got it
我知道了
class ApplicationController < ActionController::Base
protect_from_forgery
before_filter :beforeFilter
def beforeFilter
$request = request
end
end
Now we can use the $request global variable anywhere in the code
现在我们可以在代码的任何地方使用 $request 全局变量
回答by tsdbrown
You do not have access to the request object in your models, you will have to pass the request.request_uri in.
您无权访问模型中的 request 对象，您必须传入 request.request_uri 。
Perhaps via a custom method. e.g. @object.custom_method_call(params, request.request_uri)
也许通过自定义方法。例如@object.custom_method_call(params, request.request_uri)
Another option would be add an attr_accessor :request_uriin your model and set/pass that in:
另一种选择是attr_accessor :request_uri在您的模型中添加一个并设置/传递它：
@object.update_attributes(params.merge(:request_uri => request.request_uri))
回答by wuyuedefeng
if you use rails > 5.0, you can do below
如果你使用 rails > 5.0，你可以在下面做
add a module in models/concern
在模型/关注中添加模块
module Current
thread_mattr_accessor :actor
end
in applicaton_controller do
在应用程序控制器中做
around_action :set_thread_current_actor
private
def set_thread_current_actor
Current.actor = current_user
yield
ensure
# to address the thread variable leak issues in Puma/Thin webserver
Current.actor = nil
end
then in thread anywhere get current_user
然后在线程中的任何地方获取 current_user
Current.actor
回答by William
For Rails 5, you need to use before_actioninstead.
对于 Rails 5，您需要before_action改用。
回答by Manish Puri
you will need to do a hack to get request.uri in the model. which is not recommended. You should pass it as a params in the method which is defined in the model.
你需要做一个 hack 才能在模型中获取 request.uri。这是不推荐的。您应该在模型中定义的方法中将其作为参数传递。
