title: String can't be coerced into Fixnum (calling loop within method within content_tag)
body: <p>I can't work out why the following generates a "String can't be coerced into Fixnum".</p>
  
  <p>Any ideas?</p>
  
  <pre><code>  def branch_image
      image_tag("24white/branch.png")
    end
  
    def spacing_images
      i = 2
      i.times do
        image_tag("24white/blank.png")
      end
    end
  
    def insert_branch(prefix, type)
      content_tag(:li, spacing_images + branch_image + name_in_browser(prefix, type))
    end
  
    def name_in_browser(prefix, type)
       prefix + ": &amp;ldquo;" + truncate(type.name, :length =&gt; 20) + "&amp;rdquo;"
    end
  </code></pre>
  
  <p>If I edit <code>insert_branch</code> as follows, the whole package works fine:</p>
  
  <pre><code>  def insert_branch(prefix, type)
      content_tag(:li, branch_image + name_in_browser(prefix, type))
    end
  </code></pre>
  
  <p>In the trace that I've pasted below points, <code>app/helpers/application_helper.rb:31</code> is <code>def insert_branch(prefix, type)</code>.</p>
  
  <p>(Obviously the end game is to calculate <code>i</code> somewhere, but until I get this working I'm just assigning a value to it.)</p>
  
  <p>Many thanks,</p>
  
  <p>Steven.</p>
  
  <pre><code>app/helpers/application_helper.rb:31:in `+'
  app/helpers/application_helper.rb:31:in `insert_branch'
  app/views/partials/_project_browser.haml:8
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/renderable.rb:39:in `send'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/renderable.rb:39:in `render'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/renderable_partial.rb:20:in `render'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/benchmarking.rb:26:in `benchmark'
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/core_ext/benchmark.rb:8:in `realtime'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/benchmarking.rb:26:in `benchmark'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/renderable_partial.rb:19:in `render'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/template.rb:73:in `render_template'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/renderable_partial.rb:45:in `render_partial'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/partials.rb:152:in `render_partial'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/base.rb:258:in `render_without_haml'
  /Library/Ruby/Gems/1.8/gems/haml-2.2.3/lib/haml/helpers/action_view_mods.rb:11:in `render'
  /Library/Ruby/Gems/1.8/gems/haml-2.2.3/lib/haml/helpers.rb:96:in `non_haml'
  /Library/Ruby/Gems/1.8/gems/haml-2.2.3/lib/haml/helpers/action_view_mods.rb:11:in `render'
  app/views/layouts/application.html.haml:31
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/renderable.rb:39:in `send'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/renderable.rb:39:in `render'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/template.rb:73:in `render_template'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/base.rb:256:in `render_without_haml'
  /Library/Ruby/Gems/1.8/gems/haml-2.2.3/lib/haml/helpers/action_view_mods.rb:13:in `render'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/base.rb:371:in `_render_with_layout'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_view/base.rb:254:in `render_without_haml'
  /Library/Ruby/Gems/1.8/gems/haml-2.2.3/lib/haml/helpers/action_view_mods.rb:13:in `render'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/base.rb:1174:in `render_for_file'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/base.rb:905:in `render_without_benchmark'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/benchmarking.rb:51:in `render'
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/core_ext/benchmark.rb:8:in `realtime'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/benchmarking.rb:51:in `render'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/mime_responds.rb:135:in `send'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/mime_responds.rb:135:in `custom'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/mime_responds.rb:164:in `call'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/mime_responds.rb:164:in `respond'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/mime_responds.rb:158:in `each'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/mime_responds.rb:158:in `respond'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/mime_responds.rb:107:in `respond_to'
  app/controllers/projects_controller.rb:17:in `show'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/base.rb:1253:in `send'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/base.rb:1253:in `perform_action_without_filters'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/filters.rb:617:in `call_filters'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/filters.rb:610:in `perform_action_without_benchmark'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/rescue.rb:136:in `perform_action_without_caching'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/caching/sql_cache.rb:13:in `perform_action'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
  /Library/Ruby/Gems/1.8/gems/activerecord-2.2.2/lib/active_record/query_cache.rb:8:in `cache'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/caching/sql_cache.rb:12:in `perform_action'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/base.rb:524:in `send'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/base.rb:524:in `process_without_filters'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/filters.rb:606:in `process_without_session_management_support'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/session_management.rb:134:in `sass_old_process'
  /Library/Ruby/Gems/1.8/gems/haml-2.2.3/lib/sass/plugin/rails.rb:19:in `process'
  /Library/Ruby/Gems/1.8/gems/actionpack-2.2.2/lib/action_controller/base.rb:392:in `process'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:76:in `process'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `synchronize'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `process'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in `process_client'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `process_client'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `initialize'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `initialize'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:282:in `run'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `each'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `run'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:128:in `run'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:in `run'
  /Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:142:in `load_without_new_constant_marking'
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:142:in `load'
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:521:in `new_constants_in'
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:142:in `load'
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:153:in `require'
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:521:in `new_constants_in'
  /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:153:in `require'
  </code></pre>