将局部变量从控制器传递给视图 [英] Passing local variables to a view from controller

问题描述

由于某种原因，我无法将局部变量传递给显示视图...

I am not able for some reason to pass local variables to the show view...

在我的控制器中，我只是：

In my controller i have simply:

def show
  render template: "books/show", :resource => "Some text"
end

在我看来，我会打印以下内容：

In my view i print the following:

<h1>My local variable text: <%= resource %></h1>

我收到以下消息：

undefined local variable or method `resource' for #<#<Class:0x00000118ebce90>:0x00000118ec3498>

我在控制器中尝试了以下语法：

I've tried the following syntaxes in the controller:

render template: "books/show", locals: { resource: "Some text" }
render template: "books/show", locals: { resource => "Some text" }
render template: "books/show", :locals => { resource: "Some text" }
render template: "books/show", :locals => { resource => "Some text" }

没有运气...

任何线索？

谢谢！

推荐答案

将数据从控制器传递到视图

这是一个NovelController类，将放入 app / controllers / novel_controller.rb。

class NovelController < ApplicationController
      def index
        @title = 'Shattered View: A Novel on Rails'
      end
end

由于这是Novel控制器和索引操作，因此相应的视图位于 app / views / novel / index.html.erb

Since this is the Novel controller and the index action, the corresponding view is in app/views/novel/index.html.erb

<h1><%= @title %></h1>

输出：

Shattered View: A Novel on Rails

视图在 NovelController＃index 运行后被解释。这是视图可以访问和不能访问的视图：

The view is interpreted after NovelController#index is run. Here's what the view can and can't access:

• 它可以访问实例变量 @title ，因为它们是在 NovelController＃index 完成运行时在 NovelController 对象上定义的。


• 它可以调用实例变量 @title 的实例方法。

• It can access the instance variables @title, because they've been defined on the NovelController object by the time NovelController#index finishes running.
• It can call instance methods of the instance variables @title.

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