我和Sinatra一起使用苗条并且有一个奇怪的问题。在一个纤薄的模板里面，我试图渲染另一个苗条的样子：
p
== slim :search_form
这在另一个模板中完美运行，但由于某种原因，我得到以下异常：
127.0.0.1 - - [17/Oct/2014 20:00:47] "GET /__sinatra__/500.png HTTP/1.1" 304 - 0.0010
NoMethodError - undefined method `join' for #<String:0x007f9dc2c39f30>:
views/results.slim:45:in `block in singleton class'
views/results.slim:-1:in `instance_eval'
views/results.slim:-1:in `singleton class'
views/results.slim:-3:in `__tilt_70157989336980'
/Users/brendan/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/tilt-1.4.1/lib/tilt/template.rb:170:in `call'
/Users/brendan/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/tilt-1.4.1/lib/tilt/template.rb:170:in `evaluate'
/Users/brendan/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/tilt-1.4.1/lib/tilt/template.rb:103:in `render'
/Users/brendan/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/sinatra-1.4.5/lib/sinatra/base.rb:814:in `render'
/Users/brendan/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/sinatra-1.4.5/lib/sinatra/base.rb:742:in `slim'
app.rb:80:in `block in <class:Website>'
/Users/brendan/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/sinatra-1.4.5/lib/sinatra/base.rb:1603:in `call