Ruby 部分块渲染乱序

Question

我在模板中定义一个块并将其传递到部分并将其呈现为字符串，但是在部分内部调用块似乎呈现到模板上下文中？

lib/test.rb

class Test
  def render(&block)
    view = ApplicationController.new()

    view.class_eval do
      include ApplicationHelper
    end

    view.render_to_string(:partial => 'cool_partial', :locals => {
      :block   => block
    })

  end
end

controller/action.haml

= @test_obj.render do |variable|
  %td='hello-world'

app/view/_cool_partial.haml

%table
  %tr
    (0..5).each do |i|
       block.call

输出

<td>hello-world</td>
<td>hello-world</td>
<td>hello-world</td>
<td>hello-world</td>
<td>hello-world</td>
<table>
    <tr></tr>
    <tr></tr>
    <tr></tr>
    <tr></tr>
    <tr></tr>
</table>

Answer 1

这实际上是由于 HAML 内部的一个问题： http://haml.info/docs/yardoc/Haml/Engine.html

Due to some Ruby quirks, if scope is a Binding or Proc object and a block is given, the evaluation context may not be quite what the user expects.

不过，这可以通过 capture_haml 助手解决！

= capture_haml &row_block

你仍然可以传递参数，

= capture_haml arg1, arg2, &row_block

Ruby 部分块渲染乱序

Ruby partial block render out of order

ruby

ruby-on-rails-4

haml