Question

遇到if else的问题 - 我认为这是一个语法问题，但我似乎无法得到它。我使用了下面的建议，它仍然抛出500错误。我不知道确切的错误，因为有一个自定义错误消息，“500”是唯一给出的技术信息。我可以在开发方面启用调试模式，以提供其他信息吗？

我要做的是显示一个下拉列表并允许选择，如果你是“DSD”，否则应该禁用下拉列表，这就是我需要IF语句的原因。

这是我正在运行的当前if语句：

更新

        <% 
           if (sign_on.acctypw1.strip =="DS") 
               select_tag(:distributor_number_X,  options_for_select(distributors_array), {:style => "width:400px", :disabled => "true"}) 
           else (sign_on.acctypw1.strip =="DSD")               
               select_tag(:distributor_number_X, options_for_select(distributors_array), {:style => "width:400px" })
           end
        %>

这是来自服务器日志的错误：

[Mon Mar 25 09:33:41 2013] [notice] caught SIGTERM, shutting down
[ pid=8710 thr=77929640 file=utils.rb:176 time=2013-03-25 09:33:42.922 ]: *** Exception SignalException in PhusionPassenger::ClassicRails::ApplicationSpawner (SIGTERM) (process 8710, thread #<Thread:0x94a3950>):
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server.rb:343:in `select'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server.rb:343:in `server_main_loop'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server.rb:180:in `start'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/spawn_manager.rb:219:in `block (2 levels) in spawn_rails_application'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/spawn_manager.rb:214:in `block in spawn_rails_application'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server_collection.rb:82:in `block in synchronize'
from <internal:prelude>:10:in `synchronize'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.0.1/helper-scripts/passenger-spawn-server:99:in `<main>'
[Mon Mar 25 09:35:50 2013] [notice] Apache/2.2.14 (Ubuntu) Phusion_Passenger/3.0.1 configured -- resuming normal operations
 [Mon Mar 25 10:03:31 2013] [notice] caught SIGTERM, shutting down
 [Mon Mar 25 10:03:47 2013] [notice] Apache/2.2.14 (Ubuntu) Phusion_Passenger/3.0.1 configured -- resuming normal operations

Answer 1

我认为这是在你的视图中（erb.html文件）你的if和else语句也必须进入<% %>。

<% if sign_on.acctypw1.strip =="DS" %>
  <%= select_tag(:distributor_number_X, options_for_select(distributors_array), {:style => "width:400px", :disabled => "true"}) %>
<% else sign_on.acctypw1.strip =="DSD" %>             
  <%= select_tag(:distributor_number_X, options_for_select(distributors_array), {:style => "width:400px" })  %>
<% end %>

另外，要记住一些事情 -

<% "This will be evaluated" %>
<%= "This will be evaluated and outputted to your view" %>

Answer 2

您希望使用elsif而不是其他。

您还需要将if/elsif/end包裹在<% %>代码中，因为这是ERB

Answer 3

<%= 
   if (sign_on.acctypw1.strip =="DS") 
       select_tag(:distributor_number_X,  options_for_select(distributors_array), {:style => "width:400px", :disabled => "true"}) 
   else (sign_on.acctypw1.strip =="DSD")               
       select_tag(:distributor_number_X, options_for_select(distributors_array), {:style => "width:400px" })
   end
%>

RUby on rails if else语法混乱

3 个答案: