Ruby-on-rails Rails 中带有 url_for 的完整 URL
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Full URL with url_for in Rails
提问by Victor
How can I get a full url in rails?
如何在 rails 中获取完整的 url？
url_for @book is returning only a path like /book/1 and not www.domain.com/book/1
url_for @book 只返回像 /book/1 这样的路径，而不是 www.domain.com/book/1
Thanks (and sorry if the answer is obvious. Im learning rails!)
谢谢（如果答案很明显，我很抱歉。我正在学习 Rails！）
采纳答案by venables
Use the :host option. For example, you can use:
使用 :host 选项。例如，您可以使用：
url_for(@book, :host => "domain.com")
Note: with Rails 3 and above, use polymorphic_urlinstead of url_for.
注意：对于 Rails 3 及更高版本，使用polymorphic_url代替url_for。
回答by Andy Gaskell
According to the docs, this shouldn't happen. The option you're looking for is :only_pathand it's false by default. What happens if you set it to false explicitly?
根据文档，这不应该发生。您正在寻找的选项是:only_path，默认情况下它是假的。如果您将其显式设置为 false 会发生什么？
url_for(@book, :only_path => false)
While you can use url_foryou should prefer Ryan's method when you can - book_url(@book)for a full url or book_path(@book)for the path.
虽然您可以使用，但url_for您应该尽可能使用 Ryan 的方法 -book_url(@book)对于完整的 url 或book_path(@book)路径。
回答by Ryan Bigg
If it's a RESTful resource you'll be able to use this:
如果它是 RESTful 资源，您将能够使用它：
book_url(@book)
回答by a moose
It seems that this would work:
似乎这会奏效：
url_for(@book)
But it does not. The url_for method accepts only one argument, which can be either a string, an instance of a model, or a hash of options. This is rather unfortunate, as it would seem like you may need to link to @book and add options like :only_path or :host as well.
但事实并非如此。url_for 方法只接受一个参数，它可以是字符串、模型的实例或选项的散列。这是相当不幸的，因为看起来您可能需要链接到@book 并添加诸如 :only_path 或 :host 之类的选项。
One way around it is to use polymorphic_url, which would render the correct absolute url even though your model is (likely) not actually polymorphic:
一种解决方法是使用 polymorphic_url，即使您的模型（可能）实际上不是多态的，它也会呈现正确的绝对 url：
polymorphic_url(@book, :host => "domain.com")
Perhaps the best route would be to use a named route, which is set up automatically for you when declaring resources in your routes or using the :as option:
也许最好的路由是使用命名路由，它是在你的路由中声明资源或使用 :as 选项时自动为你设置的：
# in routes.rb:
resources :books
# or
get "books/:id" => "books#show", as: :book
# in your view:
book_path(@book, :host => "domain.com")
回答by sandre89
In Rails 5, if you want the full url for the current controller/action (== current page), just use:
在 Rails 5 中，如果您想要当前控制器/操作（== 当前页面）的完整 url，只需使用：
url_for(only_path: false)
Long answer:
长答案：
In Rails 5, url_forin a view is ActionView::RoutingUrlFor#url_for. If you look at it's source code (https://api.rubyonrails.org/classes/ActionView/RoutingUrlFor.html#method-i-url_for), you'll see if you pass a Hash (keyword parameters are cast into a Hash by Ruby), it actually calls super, thus invoking the method of same name in it's ancestor.
在 Rails 5 中，url_for视图是ActionView::RoutingUrlFor#url_for. 如果您查看它的源代码 ( https://api.rubyonrails.org/classes/ActionView/RoutingUrlFor.html#method-i-url_for)，您将看到是否传递了 Hash（关键字参数被 Ruby 转换为 Hash），它实际上调用了super，从而调用了它的祖先中的同名方法。
ActionView::RoutingUrlFor.ancestorsreveals that it's first ancestor is ActionDispatch::Routing::UrlFor.
ActionView::RoutingUrlFor.ancestors揭示它的第一个祖先是ActionDispatch::Routing::UrlFor。
Checking it's source code (https://api.rubyonrails.org/classes/ActionDispatch/Routing/UrlFor.html#method-i-url_for), you'll read this:
检查它的源代码（https://api.rubyonrails.org/classes/ActionDispatch/Routing/UrlFor.html#method-i-url_for），你会读到：
Missing routes keys may be filled in from the current request's parameters (e.g. :controller, :action, :id and any other parameters that are placed in the path).
可以从当前请求的参数（例如：controller、：action、：id 和放置在路径中的任何其他参数）中填充缺少的路由键。
This is very nice, since it will build automatically a URL for you for the current page (or path, if you just invoke url_forwithout the only_path: false). It will also intelligently ignore the query string params; if you need to merge those, you can use url_for(request.params.merge({arbitrary_argument:'value'})).
这非常好，因为它会自动为您构建当前页面的 URL（或路径，如果您只是在url_for没有 的情况下调用only_path: false）。它还会智能地忽略查询字符串参数；如果您需要合并这些，您可以使用url_for(request.params.merge({arbitrary_argument:'value'})).
