从模型内部访问ActionView帮助器 [英] access ActionView helpers from inside the Model
问题描述
我有一个简单的模板系统,在渲染模板时,该系统调用在模型的不同类(kinda小部件)内部定义的show_me
方法.这些小部件最初将html作为字符串返回.所以在我的erb中,我有这样的想法.
I have a simple template system which calls a show_me
method defined inside different classes of my model (kinda Widgets) when rendering a template. These widgets originally returned the html as a string. So in my erb I have somethink like this.
<% @template.widgets.each do |widget| %>
<%= widget.show_me %>
<% end %>
随着小部件的视图变得越来越复杂,我开始使用局部视图来渲染它们,从小部件内部调用ActionView::Base
渲染方法(请不要抛出:)
As the views of the widgets became more complex I start using partials to render them, calling the ActionView::Base
render method from inside my widgets (please don't throw up yet :)
def show_me
# ... specific calculations and other magic.
ActionView::Base.new(MyApp::Application.config.view_path).render(:partial => "widgets/weather_widget", :locals => {:data => data, :settings => settings})
end
所以,它的工作原理就像一个咒语(真的...),但是当我想在小部件特定的部分(例如widgets/_weater_widget.html.erb
)中使用助手时,它们将无法工作.例如. javascript_tag
加薪
So, this works like a charm (really...) but when I want to use helpers inside the widget specific partial (eg. widgets/_weater_widget.html.erb
) they don't work. for example. javascript_tag
raises
can't convert nil into String
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:790:in `join'
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:790:in `rails_asset_id'
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:813:in `rewrite_asset_path'
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:742:in `compute_public_path'
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:256:in `javascript_path'
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:822:in `javascript_src_tag'
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:362:in `block in javascript_include_tag'
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:362:in `collect'
actionpack (3.0.0) lib/action_view/helpers/asset_tag_helper.rb:362:in `javascript_include_tag'
我想我在创建ActionView :: Base时会丢失某些东西.
I think I'm missing something when I create the ActionView::Base.
有什么想法如何解决这个问题?也欢迎对总体设计提出任何建议:)
Any thoughts how to solve this? Also any suggestion on the overall design is welcome too :)
推荐答案
敬请期待MVC不会渲染模型中的视图代码. :(总是有一种更好的方法.
Please for the love of all things MVC don't render view code from a model. :( There is always a better way to do it.
示例:
class Widget < ActiveRecord::Base
def name
"weather_widget"
end
def settings
## something here
end
def data
## calculations here
end
end
助手
module WidgetHelper
def render_widget(widget)
render(:partial => "widgets/_#{widget.name}", :locals => {:data => widget.data, :settings => widget.settings})
end
end
查看
<% @template.widgets.each do |widget| %>
<%= render_widget(widget) %>
<% end %>
很显然,这可能并不是您所处情况的确切解决方案,而只是作为指南,向您展示可以做的一些事情来保持代码干净. :)
Obviously that may not be the exact solution for your situation, but is just a guide to show you something that can be done to keep your code clean. :)
这篇关于从模型内部访问ActionView帮助器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!