blocks|key|797576|text|Your::Application.routes.draw+do
++default_url_options+:host+=>+"example.com"

++#+...+snip+...
end|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|797577|在routes.rb中的某处:)|unstyled|offset|length|style|CODE|797578|entityMap^0|0|1|9|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>Your::Application.routes.draw do
 default_url_options :host =&gt; "example.com"

 # ... snip ...
end
</code></pre>

Somewhere in <code>routes.rb</code> :)

blocks|key|581628|text|主机应在每个环境的配置文件中指定。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|581629|config/environments/development.rb|code-block|syntax|javascript|581630|参见this+question和this+question。|offset|length|581631|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/7366746/missing-host-to-link-to-please-provide-host-parameter-or-set-default-url-optio|1|https://stackoverflow.com/questions/6638949/missing-host-to-link-to-for-devise^0|0|0|2|D|0|G|D|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]|$I|10|J|11|1|12]]|A|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

The host should be specified in each environment's config file. Eg:

<pre><code>config/environments/development.rb
</code></pre>

See <a href="https://stackoverflow.com/questions/7366746/missing-host-to-link-to-please-provide-host-parameter-or-set-default-url-optio">this question</a> and <a href="https://stackoverflow.com/questions/6638949/missing-host-to-link-to-for-devise">this question</a>.

blocks|key|797639|text|您可以在应用程序控制器中设置默认url选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|797640|class+ApplicationController+<+ActionController::Base
++def+default_url_options
++++{:locale+=>+I18n.locale}
++end
end|code-block|syntax|javascript|797641|http://guides.rubyonrails.org/action_controller_overview.html#default_url_options|offset|length|797642|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|29|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|T|8|@]|9|@$I|U|J|V|1|W]]|A|$]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|H]]]]

You can set default url options in the Application Controller:

<pre><code>class ApplicationController &lt; ActionController::Base
 def default_url_options
 {:locale =&gt; I18n.locale}
 end
end
</code></pre>

<a href="http://guides.rubyonrails.org/action_controller_overview.html#default_url_options" rel="nofollow">http://guides.rubyonrails.org/action_controller_overview.html#default_url_options</a>

blocks|key|797808|text|有趣的是，设置config.action_mailer.default_url_options对我没有帮助。此外，在我觉得不属于它的地方摆弄与环境无关的设置对我来说并不令人满意。此外，我还想要一个在sidekiq/resque工作者中生成urls时有效的解决方案。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|797809|到目前为止，我的方法涉及到config/environments/{development,+production}.rb：|797810|MyApp::Application.configure+do
++++#+Stuff+omitted...

++++config.action_mailer.default_url_options+=+{
++++++#+Set+things+here+as+usual
++++}
end

MyApp::Application.default_url_options+=+MyApp::Application.config.action_mailer.default_url_options|code-block|syntax|javascript|797811|这在rails+>=+3.2.x中适用。|797812|entityMap^0|7|14|0|D|1C|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Funny thing, that setting <code>config.action_mailer.default_url_options</code> does not help for me. Also, messing around with environment-independent settings in places I felt like it does not belong was not satisfying for me. Additionally, I wanted a solution that worked when generating urls in sidekiq/resque workers.

My approach so far, which goes into <code>config/environments/{development, production}.rb</code>: 

<pre><code>MyApp::Application.configure do
 # Stuff omitted...

 config.action_mailer.default_url_options = {
 # Set things here as usual
 }
end

MyApp::Application.default_url_options = MyApp::Application.config.action_mailer.default_url_options
</code></pre>

This works for me in rails >= 3.2.x.

blocks|key|581880|text|您始终可以将host作为参数传递给URL帮助器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|581881|listing_url(listing,+host:+request.host)|code-block|syntax|javascript|581882|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can always pass host as a parameter to the URL helper:

<pre><code>listing_url(listing, host: request.host)
</code></pre>

blocks|key|797895|text|虽然在路由中添加default_url不是正确的解决方案，但它在某些情况下是有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|797896|您必须在每个环境(开发、测试、生产)中设置default_url。|797897|您需要进行这些更改。|797898|++++config/environments/development.rb
+++++config.action_mailer.default_url_options+=+
++++++{+:host+=>+'your-host-name'+}++#if+it+is+local+then+'localhost:3000'

+config/environments/test.rb
++++++config.action_mailer.default_url_options+=+
++++++{+:host+=>+'your-host-name'+}++#if+it+is+local+then+'localhost:3000'

++config/environments/development.rb
+++++config.action_mailer.default_url_options+=+
++++++{+:host+=>+'your-host-name'+}++#if+it+is+local+then+'localhost:3000'|code-block|syntax|javascript|797899|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Adding the default_url in routes not the right solution although, it works for some cases.

You've to set the default_url in each environment(development, test, production).

You need make these changes.

<pre><code> config/environments/development.rb
 config.action_mailer.default_url_options = 
 { :host =&gt; 'your-host-name' } #if it is local then 'localhost:3000'

 config/environments/test.rb
 config.action_mailer.default_url_options = 
 { :host =&gt; 'your-host-name' } #if it is local then 'localhost:3000'

 config/environments/development.rb
 config.action_mailer.default_url_options = 
 { :host =&gt; 'your-host-name' } #if it is local then 'localhost:3000'
</code></pre>

blocks|key|797954|text|Rails.application.routes.default_url_options[:host]=+'localhost:3000'|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|797955|在developemnt.rb+/+test.rb中，可以更简洁，如下所示：|797956|Rails.application.configure+do
++#+...+other+config+...

++routes.default_url_options[:host]+=+'localhost:3000'
end|code-block|syntax|javascript|797957|entityMap^0|0|1X|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

<code>Rails.application.routes.default_url_options[:host]= 'localhost:3000'</code>

In the developemnt.rb / test.rb, can be more concise as following:

<pre><code>Rails.application.configure do
 # ... other config ...

 routes.default_url_options[:host] = 'localhost:3000'
end
</code></pre>

blocks|key|797998|text|转到config/environments/test.rb|type|unstyled|depth|inlineStyleRanges|entityRanges|data|797999|Rails.application.routes.default_url_options:host+=‘本地主机:3000’|798000|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

go to config/environments/test.rb

Rails.application.routes.default_url_options[:host] = 'localhost:3000'

blocks|key|582087|text|以防有人在搜索有关ActiveStorage的错误时发现以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|582088|如果你有一个控制器动作，你想用本地磁盘服务生成上传urls等(很可能是在测试环境中)，你需要在控制器中执行include+ActiveStorage::SetCurrent，以便让blob.service_url_for_direct_upload正常工作。|offset|length|style|CODE|582089|entityMap^0|0|1H|X|2I|Y|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|I|$]]

just in case someone finds this searching for errors concerning ActiveStorage:

if you have a controller-action where you want to generate upload-urls etc with the local disc-service (most likely in test environment), you need to <code>include ActiveStorage::SetCurrent</code> in the controller in order to allow <code>blob.service_url_for_direct_upload</code> to work correctly.

blocks|key|798102|text|我通过将environment.rb配置为|type|unstyled|depth|inlineStyleRanges|entityRanges|data|798103|YourApp::Application.default_url_options+=+YourApp::Application.config.action_mailer.default_url_options|798104|您需要针对每个环境(如开发、测试、试运行和生产等)设置操作邮件程序的default_url_options。|798105|参考：Missing+host+to+link+to!+Please+provide+:host+parameter+or+set+default_url_options[:host]|offset|length|798106|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/7219732/missing-host-to-link-to-please-provide-host-parameter-or-set-default-url-optio/48529627#48529627^0|0|0|0|3|2H|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

I solved the issue by configuring environment.rb as

YourApp::Application.default_url_options = YourApp::Application.config.action_mailer.default_url_options

You need to set default_url_options for action mailer against each environment like development, testing, staging and production etc.

Reference: <a href="https://stackoverflow.com/questions/7219732/missing-host-to-link-to-please-provide-host-parameter-or-set-default-url-optio/48529627#48529627">Missing host to link to! Please provide :host parameter or set default_url_options[:host]</a>

blocks|key|798150|text|上面的答案对我不起作用，至少不是我想要的。在安装devise之后，我意识到了config.action_mailer.default_url_options+=+{+host:+"localhost",+port:+3000+}。希望它能帮助有同样问题的人。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|798151|entityMap^0|12|24|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

The above answer did not work for me, at least not as I wanted. 
I realised 
<code>config.action_mailer.default_url_options = { host: "localhost", port: 3000 }</code>
after installing devise.
Hope it will help someone with the same problem.

blocks|key|582178|text|我不想改变其他环境的行为，所以我使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|582179|development.rb|582180|Rails.application.configure+do
...
end

Rails.application.default_url_options+=+Rails.application.config.action_mailer.default_url_options|code-block|syntax|javascript|582181|在Rails+6中工作。|582182|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Didn't want to change the behavior for other environments, so I used:
development.rb
<pre><code>Rails.application.configure do
...
end

Rails.application.default_url_options = Rails.application.config.action_mailer.default_url_options
</code></pre>
Works in Rails 6.

I have been googling for about 90 minutes now and still don't have an answer to this. Where do I set <code>default_url_options</code>? I've already set it for <code>config.action_mailer.default_url_options</code> to solve this same bug elsewhere, but now I'm getting this error when trying to use a URL helper inside an RSpec spec. I have no idea where it's expecting default_url_options to be set.

<pre><code> Failure/Error: listing_url(listing).should match(/\/\d+-\w+$/)
 RuntimeError:
 Missing host to link to! Please provide :host parameter or set default_url_options[:host]
 # ./spec/routing/listing_routing_spec.rb:9:in `block (3 levels) in &lt;top (required)&gt;'
</code></pre>

This code has nothing to do with emails/ActionMailer, it just happens to need a URL instead of a path.

Any ideas?

Rails: Missing host to link to! Please provide :host parameter or set default_url_options[:host]

路由

我已经用谷歌搜索了大约90分钟，但仍然没有答案。我在哪里设置default_url_options？我已经为config.action_mailer.default_url_options在其他地方解决了同样的错误，但是现在当我试图在RSpec规范中使用URL helper时，我得到了这个错误。我不知道它期望将defa...

问Rails:缺少要链接的主机！请提供:host参数或设置default_url_options[:host]
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