blocks|key|887188|text|您创建的表单在从Devise控制器呈现时可以正常工作，因为“资源”是通过Devise定义的。看看Devise+SessionsController的实现--据我所知，您正在尝试复制“新”操作。"build_resource“方法可能就是您想要的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|887189|Warden+gem是“资源”对象的来源。如果你想深入挖掘，那将是寻找的地方。|887190|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/plataformatec/devise/blob/master/app/controllers/devise/sessions_controller.rb|1|http://github.com/hassox/warden^0|1C|P|0|0|0|6|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

The form you created works when rendered from a Devise controller because "resource" is defined through Devise. Take a look at the implementation of the <a href="http://github.com/plataformatec/devise/blob/master/app/controllers/devise/sessions_controller.rb" rel="nofollow">Devise SessionsController</a> - from what I understand, you're attempting to replicate the "new" action. The method "build_resource" is probably what you're looking after.

The <a href="http://github.com/hassox/warden" rel="nofollow">Warden</a> gem is where the "resource" objects are coming from. If you wish to dig deeper, that'd be the place to look.

blocks|key|887240|text|正如Andres所说，表单调用由Devise指定的帮助器，因此当您从非Devise控制器访问Devise表单时不会出现。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|887241|要解决此问题，您需要将以下方法添加到要在其下显示窗体的控制器的helper类中。或者，您可以将它们添加到您的应用程序帮助器中，以便在任何地方都可以使用它们。|887242|++def+resource_name
++++:user
++end

++def+resource
++++@resource+%7C%7C=+User.new
++end

++def+devise_mapping
++++@devise_mapping+%7C%7C=+Devise.mappings[:user]
++end|code-block|syntax|javascript|887243|来源：http://pupeno.com/blog/show-a-devise-log-in-form-in-another-page/|offset|length|887244|entityMap|0|LINK|mutability|MUTABLE|url|http://pupeno.com/blog/show-a-devise-log-in-form-in-another-page/^0|0|0|0|3|1T|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

As Andres says, the form calls helpers which are specified by Devise and so aren't present when you access a Devise form from a non-Devise controller.

To get around this, you need to add the following methods to the helper class of the controller you wish to display the form under. Alternatively, you can just add them to your application helper to make them available anywhere.

<pre><code> def resource_name
 :user
 end

 def resource
 @resource ||= User.new
 end

 def devise_mapping
 @devise_mapping ||= Devise.mappings[:user]
 end
</code></pre>

Source: <a href="http://pupeno.com/blog/show-a-devise-log-in-form-in-another-page/">http://pupeno.com/blog/show-a-devise-log-in-form-in-another-page/</a>

blocks|key|1102084|text|可以尝试这个also...check这个question。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1102085|Source|1102086|<%25=+form_for("user",+:url+=>+user_session_path)+do+%7Cf%7C+%25>
++<%25=+f.text_field+:email+%25>
++<%25=+f.password_field+:password+%25>
++<%25=+f.check_box+:remember_me+%25>
++<%25=+f.label+:remember_me+%25>
++<%25=+f.submit+'Sign+in'+%25>
++<%25=+link_to+"Forgot+your+password?",+new_password_path('user')+%25>
<%25+end+%25>+|code-block|syntax|javascript|1102087|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/q/13079079/147306|1|https://github.com/plataformatec/devise/wiki/How-To:-Display-a-custom-sign_in-form-anywhere-in-your-app^0|K|8|0|0|0|6|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

Can try this also...check this <a href="https://stackoverflow.com/q/13079079/147306">question</a>.

<a href="https://github.com/plataformatec/devise/wiki/How-To:-Display-a-custom-sign_in-form-anywhere-in-your-app" rel="nofollow noreferrer">Source</a>

<pre><code>&lt;%= form_for("user", :url =&gt; user_session_path) do |f| %&gt;
 &lt;%= f.text_field :email %&gt;
 &lt;%= f.password_field :password %&gt;
 &lt;%= f.check_box :remember_me %&gt;
 &lt;%= f.label :remember_me %&gt;
 &lt;%= f.submit 'Sign in' %&gt;
 &lt;%= link_to "Forgot your password?", new_password_path('user') %&gt;
&lt;% end %&gt; 
</code></pre>

blocks|key|887295|text|我从我的一个控制器中得到了您所描述的相同的错误undefined+local+variable+or+method+"resource"，因为我的控制器基类缺少以下内容(Rails-API+ActionController::API出错)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|887296|include+ActionController::Helpers|code-block|syntax|javascript|887297|因此，无法在视图中解析Devise中的辅助方法。|887298|要让Devise与Rails-API一起工作，我需要包括：|887299|class+ApplicationController+<+ActionController::API

++include+AbstractController::Rendering
++include+AbstractController::Layouts
++include+ActionController::MimeResponds
++include+AbstractController::Translation
++include+ActionController::ImplicitRender
++include+ActionController::Helpers|887300|entityMap^0|N|19|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|R|$]]

I was getting the same error <code>undefined local variable or method "resource"</code> you describe from one of my controllers, because my controller base class was missing the following (Rails-API ActionController::API was at fault):

<pre><code>include ActionController::Helpers
</code></pre>

Thus the helper methods from Devise could not be resolved in the view.

To make Devise work with Rails-API I needed to include:

<pre><code>class ApplicationController &lt; ActionController::API

 include AbstractController::Rendering
 include AbstractController::Layouts
 include ActionController::MimeResponds
 include AbstractController::Translation
 include ActionController::ImplicitRender
 include ActionController::Helpers
</code></pre>

blocks|key|887344|text|为了改进可接受的答案，我们使用此帮助程序来允许不同类型的资源：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|887345|def+resource_name
++@resource_name+%7C%7C=+if+admin_controller?
++++:admin_user
++else
++++:user
++end
end

def+resource
++@resource+%7C%7C=+resource_name.to_s.classify.constantize.new
end

def+devise_mapping
++@devise_mapping+%7C%7C=+Devise.mappings[resource_name]
end|code-block|syntax|javascript|887346|其中，admin_controller?是我们以前在ApplicationController中用来处理登录重定向的东西：|offset|length|style|CODE|887347|def+admin_controller?
++!devise_controller?+and+request.path+=~+/%5E\/admin/
end
helper_method+:admin_controller?|887348|entityMap^0|0|0|3|H|Q|L|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

To refine on the accepted answer, we use this helper to allow different types of resources:

<pre><code>def resource_name
 @resource_name ||= if admin_controller?
 :admin_user
 else
 :user
 end
end

def resource
 @resource ||= resource_name.to_s.classify.constantize.new
end

def devise_mapping
 @devise_mapping ||= Devise.mappings[resource_name]
end
</code></pre>

where <code>admin_controller?</code> is something we have from before in the <code>ApplicationController</code> to handle login redirects:

<pre><code>def admin_controller?
 !devise_controller? and request.path =~ /^\/admin/
end
helper_method :admin_controller?
</code></pre>

I am using a devise gem for sign_in/sign_out procedures.

I generated views files from devise, using <code>rails g devise views</code>

I saw there was a devise/sessions/new.html.erb file which contained a form for sign_in.

I created another file devise/sessions/_form.html.erb and did <code>&lt;%= render 'form' %&gt;</code> within a new.html.erb file, and that worked out very fine.

Now, I wanted to include this form from the different controller. So in a controller called 'main', (specifically, within view page) 'mains/index.html.erb' I included <code>&lt;%= render 'devise/sessions/form' %&gt;</code> file. It seems that inclusion worked fine, but I am getting the following error.

<pre><code>NameError in Mains#index

Showing /home/administrator/Ruby/site_v4_ruby/app/views/devise/sessions/_form.html.erb where line #1 raised:

undefined local variable or method `resource' for #&lt;#&lt;Class:0x007f1aa042d530&gt;:0x007f1aa042b870&gt;
Extracted source (around line #1):

1: &lt;%= form_for(resource, :as =&gt; resource_name, :url =&gt; session_path(resource_name)) do |f| %&gt;
2: &lt;p&gt;&lt;%= f.label :email %&gt;&lt;br /&gt;
3: &lt;%= f.text_field :email %&gt;&lt;/p&gt;
4: 
</code></pre>

It seems that form_for(resource,...) part is causing the problem (which works fine if I am on the original devise sign_in page... How can I resolve this problem in rails way?

I personally prefer to use 'render' function to include the form, rather than writing html codes inline.

Do I have to specify something (resource) within the 'main' controller? 

I will appreciate your help. Thank you.

Devise form within a different controller

我正在使用一个设计性的gem来执行登录/登出过程。我使用rails g devise views从devise生成视图文件我看到有一个devise/sessions/new.html.erb文件，其中包含一个sign_in表单。我创建了另一个文件devise/sessions/_form.html.erb，并在一个ne...

问在不同的控制器中设计窗体
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