ruby-on-rails - 如何在 Rails View 中遍历数组？

Question

我在 MySql 中进行了查询，但在 Rails 和 mysql2 gem 中工作。

信息如下:

http://sqlfiddle.com/#!2/9adb8/6

查询工作正常，没有问题，并显示以下结果:

 UNIT  V1  A1  N1   V2 A2  N2   V3  A3  N3   V4  A4  N4   V5  A5  N5
 LIFE  2   0   0    1   2  0    0   0   0     0   0   0   0    0   0
 ROB   0   1   0    0   1  2    0   0   0     0   0   0   0    0   0 

-为 rails 2.3.8 安装了 mysql2 gem

gem install mysql2 -v0.2.6

-创建 Controller :

class PolicyController < ApplicationController

   def index
      @result =  ActiveRecord::Base.connection.execute("select distinct @sql := concat('SELECT pb.name as unit,',group_concat(concat('SUM(CASE WHEN p.state =0 AND ce.id=',id,' THEN 1 ELSE 0 END ) AS v',id,',SUM(CASE WHEN p.state =1 AND ce.id=',id,' THEN 1 ELSE 0 END ) AS a',id,',SUM(CASE WHEN p.state =2 AND ce.id=',id,' THEN 1 ELSE 0 END ) AS n',id)),' FROM cia_ensures ce LEFT JOIN policies p on ce.id = p.cia_ensure_id INNER JOIN policy_business_units pb ON pb.id = p.policy_business_unit_id  INNER JOIN comercial_areas ca ON ca.id = pb.comercial_area_id AND ca.id=1  Group by p.policy_business_unit_id') from cia_ensures where id in(1,2,3,4,5);")
      @result2 = ActiveRecord::Base.connection.execute("prepare stmt from @sql;")
      @result3 = ActiveRecord::Base.connection.execute("execute stmt;")
   end

end

这是日志:

SQL (0.9ms)   select distinct @sql := concat('SELECT pb.name as unit,',group_concat(concat('SUM(CASE WHEN p.state =0 AND ce.id=',id,' THEN 1 ELSE 0 END ) AS v',id,',SUM(CASE WHEN p.state =1 AND ce.id=',id,' THEN 1 ELSE 0 END ) AS a',id,',SUM(CASE WHEN p.state =2 AND ce.id=',id,' THEN 1 ELSE 0 END ) AS n',id)),' FROM cia_ensures ce LEFT JOIN policies p on ce.id = p.cia_ensure_id INNER JOIN policy_business_units pb ON pb.id = p.policy_business_unit_id INNER JOIN comercial_areas ca ON ca.id = pb.comercial_area_id AND ca.id=1 Group by p.policy_business_unit_id') from cia_ensures where id in(1,2,3,4,5);
SQL (0.9ms)   prepare stmt from @sql;
SQL (0.2ms)   execute stmt;

这是 View (工作正常，没有问题，但似乎太长了，多次编写相同的代码)

<table>
  <% @result3.each do |policy| %>
  <tr>
      <td><%= policy[0] %></td>
      <td><%= policy[1] %></td>
      <td><%= policy[2] %></td>
      <td><%= policy[3] %></td>
      <td><%= policy[4] %></td>
      <td><%= policy[5] %></td>
      ...
  </tr>
  <%end%> 
</table>

我尝试使用 inspect，但它在一个 td 中显示所有信息，而不是在每个 td 中显示:

<% @result3.each do |policy| %>
<tr>      
 <td align="center"><%= policy.inspect %></td>
</tr>
<%end%> 

如何在不写很多行的情况下显示所有这些内容？

是否可以在一行中完成此操作？不写 <%= policy[#NUMBER] %>

有人可以帮我吗？

我会非常感激。

Answer 1

嗯，可能误解了你的问题，因为它看起来很简单，你是想缩短这个吗？

改变:

<td><%= policy[0] %></td>
<td><%= policy[1] %></td>
<td><%= policy[2] %></td>
<td><%= policy[3] %></td>
<td><%= policy[4] %></td>
<td><%= policy[5] %></td>

收件人:

<% policy.each do |p| %>
  <td><%= p %></td>
<% end %>