在 Rails Helper 中为其他作用域方法创建作用域块

发布于 2024-10-11 03:24:18 字数 678 浏览 4 评论 0原文

我想在块帮助器中定义一些帮助器方法，但将它们保留在块的范围内，以便我可以拥有合理的方法名称并且看起来更干净。

假设我想要执行以下操作（一个非常基本的示例），在我看来，使用助手：

<%= foo_box do |b| %>
    <%= b.title( 'Foo Bar' ) %>
    Lorem Ipsum...
<% end %>

要生成类似

<div class="foo_box">
   <h2>Foo Bar</h2>
   Lorem Ipsum...
</div>

这样的内容，我还可以有一个 bar_box 块助手，它也可以有一个 title 方法输出完全不同的东西。

目前，我将它们实现为不同的方法，例如 foo_box 和 foo_box_title，用 foo_box 处理块，如下所示：

def foo_box(&block)
  content_tag(:div, capture(&block), :class => 'foo_box')
end

原文

I would like to define some helper methods within a block helper but keep them within the scope of the block so that I can have sensible method names and it looks cleaner.

Say I want to do the following (a very basic example), in my view using helpers:

<%= foo_box do |b| %>
    <%= b.title( 'Foo Bar' ) %>
    Lorem Ipsum...
<% end %>

To produce something like

<div class="foo_box">
   <h2>Foo Bar</h2>
   Lorem Ipsum...
</div>

This way I could also have a bar_box block helper which could also have a title method which outputs something totally different.

Currently I have them implemented as different methods, e.g. foo_box and foo_box_title, with foo_box handling the block like so:

def foo_box(&block)
  content_tag(:div, capture(&block), :class => 'foo_box')
end

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一刻暧昧 2024-10-18 03:24:18

从表面上看，capture 不允许您将任何参数传递到您想要执行的块中。 (b) 中的 bass 参数必须是您定义 title 等方法的某种对象。因此，让我们定义一个帮助器类，它将输出您需要的内容，并将其传递给从视图传入的块，然后捕获它并将其包围在 div 中，就像上面所做的那样。我会做这样的事情：

class FooBoxHelper
  include ActionView::Helpers::TagHelper  
  def title(text)
    content_tag(:h2, text)
  end
  def small(text)
    content_tag(:p, text, :class => "small")
  end
end

def foo_box(&block)

  new_block = Proc.new do 
    helper = FooBoxHelper.new
    block.call(helper)
  end
  content_tag(:div, capture(&new_block), :class => 'foo_box')
end

看看我如何绕过捕获方法的限制？通过将新的 Proc 绑定到当前作用域，并在其中传递辅助对象，我们得到一个可以不带参数调用的块，因此可以被 capture 接受。另外，请确保您的帮助程序类包含 ActionView::Helpers 中的所有相关帮助程序方法。希望这有帮助！

By the looks of it, capture doesn't let you pass any arguments into the block, which you want to do. The argument to bass in (b) has to be an object of some sort that you define the title etc. methods on. So, lets define a helper class which will output the stuff you need, and pass it to the block passed in from the view, and then capture it and surround it in the div as you did above. I would do something like this:

class FooBoxHelper
  include ActionView::Helpers::TagHelper  
  def title(text)
    content_tag(:h2, text)
  end
  def small(text)
    content_tag(:p, text, :class => "small")
  end
end

def foo_box(&block)

  new_block = Proc.new do 
    helper = FooBoxHelper.new
    block.call(helper)
  end
  content_tag(:div, capture(&new_block), :class => 'foo_box')
end

See how I got around the limitation of the capture method? By binding a new Proc to the current scope, and passing in the helper object there, we get a block we can call with no arguments, and thus acceptable by capture. Also, make certain your helper class includes all the relevant helper methods from ActionView::Helpers. Hope this helps!

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