Rails 3：如何在rake任务中呈现ERb模板？ [英] Rails 3: How to render ERb template in rake task?

问题描述

我正在用rake渲染一个非常大的站点地图HTML文件。不幸的是，当我迁移到rails 3时，代码中断了。

I am rendering a pretty huge sitemap HTML file with rake. Unfortunately, the code breaks when I migrate to rails 3. My current code looks like this:

@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))

此代码在2.3中工作，但在Rails 3中中断，因为url_for不再访问@controller，而是controller。 （我认为这就是原因。）

This code worked in 2.3, but breaks in Rails 3 as url_for does not access @controller anymore, but controller. (I think that's why.)

undefined local variable or method `controller' for #<Object:0x3794c>
/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'
(erb):5
/Users/me/Documents/Projects/zvg2/lib/tasks/zvg.rake:452

我还尝试创建一个ActionView来做到这一点：

I also tried creating an ActionView to do it like that:

av = ActionView::Base.new(Rails::Application::Configuration.new(Rails.root).view_path, {
  # my assigns
}, @controller)
av.class_eval do
  include ApplicationHelper
end
f.puts(av.render(:template => "sitemap/index.html"))

但问题似乎相同，尽管ActionView： ：base.new接管我的控制器。

But the problem seems to be the same, although ActionView::Base.new takes my controller.

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

用rake渲染使用url_for和link_to的模板的最佳实践是什么？我敢打赌，因为Rails才有了更多的模块化，为此应该有一个简单的方法吗？

What's the best practice for rendering a template with rake that uses url_for and link_to? I bet as Rails just got more modular, there should be an easy way for just this?

预先感谢！ Jan

推荐答案

当我包含Rails.application.routes.url_helpers而不是ActionView :: Helpers :: UrlHelper时，其中一种方法有效。暂时有效：

One of the approaches works when I include Rails.application.routes.url_helpers instead of ActionView::Helpers::UrlHelper. This works for now:

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

希望这对其他人有帮助。如果有更好的解决方案，我会很感兴趣。

Hope this helps others. If there is a better solution, I'd be interested.

此外，如何从绑定中自动获取分配的哈希值？

Also, how do I automatically get a hash of assigns from binding?

这篇关于Rails 3：如何在rake任务中呈现ERb模板？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！