Ruby-on-rails 渲染传递局部变量的模板时出现问题
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Trouble on rendering a template passing a local variable
提问by user502052
I am running Ruby on Rails 3 and I would like to render a template (show.html.erb) passing a local variable.
我正在运行 Ruby on Rails 3，我想呈现一个show.html.erb传递局部变量的模板 ( )。
In RAILS_ROOT/views/users/show.html.erbI have
在RAILS_ROOT/views/users/show.html.erb我有
Name: <%= @user.name %>
Surname: <%= @user.surname %>
I have also a page controller to handle pages and in the application_controller.rban istance of @current_user. A page is called user, so in RAILS_ROOT/views/pages/user.html.erbI have
我也有一个页面控制器来处理页面中和application_controller.rb的istance @current_user。一个页面被调用user，所以在RAILS_ROOT/views/pages/user.html.erb我有
<%= render :template => "users/show", :locals => { :user => @current_user } %>
The above code doesn't work (I get this error: RuntimeError in Pages#user, Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id) but this works:
上面的代码不起作用（我收到此错误RuntimeError in Pages#user, Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id：），但这有效：
<%= render :template => "users/show", :locals => { :user => @user = @current_user } %>
I think it is not a good approachto "overwrite" the @uservariable. This is because, for example, if I need to recall @userafter the above 'render' statement it will don't work anymore.
我认为这不是“覆盖”@user变量的好方法。这是因为，例如，如果我需要@user在上面的 'render' 语句之后回忆起来，它将不再起作用。
So, what is a solution in order to render show.html.erb?
那么，什么是渲染的解决方案show.html.erb？
I tryed also
我也试过
<%= render :template => "users/show", :locals => { @user => @current_user } %>
<%= render :template => "users/show", :locals => { :object => @current_user, :as => @user }
but those don't work.
但那些不起作用。
UPDATE
更新
If in pages_controller.rbI put this
如果pages_controller.rb我把这个
def user
@user ||= @current_user
end
it will work and in the view files you can just use
它会工作，在视图文件中你可以使用
<%= render :template => "users/show" %>
Anyway, I discoverd that I have this error (see below for more info):
无论如何，我发现我有这个错误（更多信息见下文）：
ActionController::RoutingError in Pages#user
No route matches {:action=>"destroy", :controller=>"users"}
The error is generated from this formstatement located in a partial loaded from show.html.erb:
错误是从位于部分加载的以下表单语句中生成的show.html.erb：
<%= form_for(@user, :url => user_path) do |f| %>
...
<% end %>
回答by Nikita Rybak
:locals => { :user => @current_user }
and in template
并在模板中
Name: <%= user.name %>
Local variables are local, so you don't need @to refer them.
局部变量是局部的，所以你不需要@引用它们。
@user502052
You can render view explicitly from your controller.
@user502052
您可以从控制器显式呈现视图。
render :template => "users/show", :locals => {...}
When you don't execute renderin controller, framework does that for you with default parameters. When you do, you can specify different template file, pass local variables, render a partial: anything renderfunction supports.
当您不在render控制器中执行时，框架会使用默认参数为您执行此操作。当你这样做时，你可以指定不同的模板文件，传递局部变量，渲染部分：任何render函数支持的东西。
回答by Vlad
Just in case you are NOT rendering a partial, and do not want to use :template option, this can also be done in Rails 4 with:
以防万一您不渲染部分，并且不想使用 :template 选项，这也可以在 Rails 4 中完成：
render 'users/show', {user: @current_user}
回答by mikewilliamson
Url:
网址：
http://localhost/pages/user
this will call the user method on pages_controller. You have this:
这将调用 pages_controller 上的用户方法。你有这个：
def user
@user ||= @current_user
end
Rails creates an instance variable @users and by default will try to render a view template at app/views/pages/user.html.erb. If that is not what you want, you have to say so in the controller:
Rails 创建了一个实例变量@users，默认情况下会尝试在 app/views/pages/user.html.erb 中渲染一个视图模板。如果这不是你想要的，你必须在控制器中这么说：
def user
@user ||= @current_user
render :template => "users/show", :locals => { :user => @current_user }
end
This will now render app/views/users/show.html.erb with a local variable called user instead of the default app/views/pages/user.html.erb.
现在，这将使用名为 user 的局部变量呈现 app/views/users/show.html.erb，而不是默认的 app/views/pages/user.html.erb。
Currently you are waiting until you are inside a view template and then asking to render another view template. Once you are in a view template you should only need to render partial templates:
目前您正在等待，直到您进入视图模板，然后要求呈现另一个视图模板。进入视图模板后，您应该只需要呈现部分模板：
render :partial => 'users/show', :locals => {:user => @current_user}
Hopefully that helps clarify.
希望这有助于澄清。
