Ruby on rails 3 Rails 3：如何在rake任务中呈现ERb模板？

我正在用rake呈现一个相当大的站点地图HTML文件。不幸的是，当我迁移到rails 3时，代码中断了。我当前的代码如下所示：

@controller = ActionController::Base.new
@controller.request = ActionController::TestRequest.new
@controller.instance_eval do
  @url = ActionController::UrlRewriter.new(request, {})
end

# collect data, open output file file

template = ERB.new(IO.read("#{RAILS_ROOT}/app/views/sitemap/index.html.erb"))
f.puts(template.result(binding))

class Template < ActionView::Base
  include Rails.application.routes.url_helpers
  include ActionView::Helpers::TagHelper

  def default_url_options
    {host: 'yourhost.org'}
  end
end  

template = Template.new(Rails.root.join('app', 'views'))
template.assign(attendee: @attendee)
template.render(template: 'sitemap/index.html.erb')

这段代码在2.3中运行，但在Rails 3中中断，因为url_不再访问@controller，而是访问controller。（我想这就是原因。）

但问题似乎是一样的，尽管ActionView:：Base.new占用了我的控制器

undefined local variable or method `controller' for nil:NilClass
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/whiny_nil.rb:48:in `method_missing'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/helpers/url_helper.rb:31:in `url_options'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_dispatch/routing/url_for.rb:132:in `url_for'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/helpers/url_helper.rb:99:in `url_for'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_dispatch/routing/url_for.rb:132:in `url_for'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/helpers/url_helper.rb:99:in `url_for'
/Users/me/Documents/Projects/zvg2/app/views/sitemap/index.html.erb:5:in `_app_views_sitemap_index_html_erb__757224102_30745030_0'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/template.rb:135:in `send'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/template.rb:135:in `render'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/notifications.rb:54:in `instrument'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/template.rb:127:in `render'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/render/rendering.rb:59:in `_render_template'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/notifications.rb:52:in `instrument'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/notifications.rb:52:in `instrument'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/render/rendering.rb:56:in `_render_template'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/render/rendering.rb:26:in `render'
/Users/me/Documents/Projects/zvg2/lib/tasks/zvg.rake:450

使用使用url和链接的rake呈现模板的最佳实践是什么？我敢打赌，由于Rails刚刚变得更加模块化，应该有一种简单的方法来实现这一点

---

提前谢谢！Jan

当我包含Rails.application.routes.url\u helpers而不是ActionView:：helpers:：UrlHelper时，其中一种方法是有效的。目前这是可行的：

include Rails.application.routes.url_helpers # brings ActionDispatch::Routing::UrlFor
include ActionView::Helpers::TagHelper

av = ActionView::Base.new(Rails.root.join('app', 'views'))
av.assign({
  :regions => @regions,
  :courts_by_region => @courts_by_region,
  :cities_by_region => @cities_by_region,
  :districts_by_region => @districts_by_region
})
f = File.new(file_name, 'w')
f.puts(av.render(:template => "sitemap/index.html"))
f.close

希望这能帮助别人。如果有更好的解决办法，我会感兴趣的

---

另外，如何从绑定中自动获取分配的哈希值？

我成功地执行了以下操作：

@controller = ActionController::Base.new
@controller.request = ActionController::TestRequest.new
@controller.instance_eval do
  @url = ActionController::UrlRewriter.new(request, {})
end

# collect data, open output file file

template = ERB.new(IO.read("#{RAILS_ROOT}/app/views/sitemap/index.html.erb"))
f.puts(template.result(binding))

class Template < ActionView::Base
  include Rails.application.routes.url_helpers
  include ActionView::Helpers::TagHelper

  def default_url_options
    {host: 'yourhost.org'}
  end
end  

template = Template.new(Rails.root.join('app', 'views'))
template.assign(attendee: @attendee)
template.render(template: 'sitemap/index.html.erb')

类模板

这就是我的工作原理（Rails 3）：

class TaskActionView“path/to/template”）

---

这成功地包括了我的应用程序帮助程序、标记帮助程序和url帮助程序。您需要将您的应用程序/环境主机正确地放入默认的\u url\u options散列中。

这对我很有用：

html = render_to_string(:index, layout: nil)

---

谢谢你，乔希！！！您的ActionController和ActionDispatch解决方案在生产环境和嵌套部分中运行良好，而其他解决方案仅在开发环境中运行。一件事是，RubyonRails 3.2.x的模板名称中不需要

.html.erb

。使用

.html.erb

它会产生弃用警告，并要求使用

:handlers

和

:formats

这在rails 3.2上适用吗？我在控制台中尝试了这个未定义的方法。

html = render_to_string(:index, layout: nil)