Ruby-on-rails 如何在 rails 中为 url helper 设置默认主机？

How do I set default host for url helpers in rails?

提问by gorn

I would like to do something like this

我想做这样的事情

config.default_host = 'www.subdomain.example.com'

in some of my configuration files, so that object_urlhelpers (ActionView::Helpers::UrlHelper) produce links beginning with http://www.subdomain.example.com

在我的一些配置文件中，以便object_url助手 ( ActionView::Helpers::UrlHelper) 生成以http://www.subdomain.example.com开头的链接

I have tried to search the docs but I did not find anything except ActionMailerdocs and http://api.rubyonrails.org/classes/Rails/Configuration.htmlwhich is not useful for me, because I do not know in which pat to look. Is there a place which describes the whole structure of Rails::Initializer.config?

我试图搜索文档，但除了ActionMailer文档和http://api.rubyonrails.org/classes/Rails/Configuration.html之外我什么也没找到，这对我没有用，因为我不知道在哪个 pat . 有没有地方描述 Rails::Initializer.config 的整个结构？

采纳答案by Wilhelm

asset_hostdoesn't work for urls

asset_host不适用于网址

You need to override default_url_optionsin your ApplicationController(at least in Rails 3)

你需要重写default_url_options你的ApplicationController（至少在Rails 3中）

http://edgeguides.rubyonrails.org/action_controller_overview.html#default-url-options

http://edgeguides.rubyonrails.org/action_controller_overview.html#default-url-options

class ApplicationController < ActionController::Base
  def default_url_options
    if Rails.env.production?
      {:host => "myproduction.com"}
    else  
      {}
    end
  end
end

回答by Andrew

Define the default host in your environment config:

在您的环境配置中定义默认主机：

# config/environments/staging.rb
MyApp::Application.configure do
  # ...
  Rails.application.routes.default_url_options[:host] = 'preview.mydomain.com'
  # ...
end

Then you can create a URL anywhere in your app:

然后你可以在你的应用程序的任何地方创建一个 URL：

Rails.application.routes.url_helpers.widgets_url()

Or include the URL helpers in your class:

或者在你的类中包含 URL 助手：

class MyLib
  include Rails.application.routes.url_helpers

  def make_a_url
    widgets_url
  end
end

If you don't define the default host, you will need to pass it as an option:

如果您没有定义默认主机，则需要将其作为选项传递：

widgets_url host: (Rails.env.staging? ? 'preview.mydomain.com' : 'www.mydomain.com')

It's also useful to specify things like the protocol:

指定协议之类的内容也很有用：

widgets_url protocol: 'https'

回答by goma

Another way is to set it like this

另一种方法是这样设置

# config/production.rb
config.action_controller.default_url_options = { host: 'myproduction.com' }

回答by NStojanovic

You can easily set :hostor/and :only_pathparameter for every url_helper. yours_url(params, :host => "http://example.com", :only_path => Rails.env.test?) This way you are not setting global default_url_options in your environments, unless you want that.

您可以轻松地为每个 url_helper设置:host或/和:only_path参数。 yours_url(params, :host => "http://example.com", :only_path => Rails.env.test?) 这样你就不会在你的环境中设置全局 default_url_options，除非你想要。

回答by Robert Speicher

As far as I know, the *_urlhelpers use the server's configured host name. So for example if my Apache installation is accepting requests for this Rails app at http://www.myapp.com/then Rails will use that address. That's why the *_urlmethods in a development environment point to http://localhost:3000by default.

据我所知，*_url助手使用服务器配置的主机名。例如，如果我的 Apache 安装正在接受对这个 Rails 应用程序的请求，http://www.myapp.com/那么 Rails 将使用该地址。这就是为什么*_url开发环境中的方法http://localhost:3000默认指向的原因。

The asset host suggested in the previous answer will only affect the image_tag, stylesheet_link_tagand javascript_link_taghelpers.

上一个答案中建议的资产主机只会影响image_tag,stylesheet_link_tag和javascript_link_tag助手。

回答by prasanthrubyist

Simplest way to get your dynamic domain url using a Global variable in rails.

使用 rails 中的全局变量获取动态域 url 的最简单方法。

class ApplicationController < ActionController::Base
  def base_url       
    $base_url = request.base_url
  end

end

After just call this method into your header file <% base_url %>, Now you can access your domain url anywhere in your application.

只需将此方法调用到您的头文件中<% base_url %>，现在您就可以在应用程序的任何位置访问您的域 url。

回答by simianarmy

NSD's solution is how I do it, but I had to add a block to make it work with https:

NSD 的解决方案是我的方法，但我必须添加一个块才能使其与 https 一起使用：

config.action_controller.asset_host = Proc.new { |source, request|
  (request ? request.protocol : 'http://') +  "www.subdomain.example.com"
}

回答by Azeem.Butt

There's this, but I'm not terribly sure if they're the helpers you're referring to:

有这个，但我不太确定他们是否是您所指的帮手：

ActionController::Base.asset_host = "assets.example.com"

http://api.rubyonrails.org/classes/ActionView/Helpers/AssetTagHelper.html

http://api.rubyonrails.org/classes/ActionView/Helpers/AssetTagHelper.html