创建动态参数的问题

Question

我使用具有时间范围的 rails 做了一个应用程序，我正在尝试创建一个动态参数以不重复我每年的所有时间，我只想从我的控制器中选择年份和查询。

这是我的桌子：

|policies|
  |id|   |date_ini|   |date_end|
   1     2013-01-01   2014-01-01      
   2     2012-02-01   2013-02-01     
   3     2013-03-01   2013-03-03     
   4     2013-04-01   2013-08-01     

这是范围：

 date_ini <=    range_of_each_policy    <= date_end

这是使用 2013 年的逻辑：

|jan| |feb| |mar| |apr| |may| |jun| |jul| |ago| |sep| |oct| |nov| |dic|
 id1   id1   id1   id1   id1   id1   id1   id1   id1   id1   id1   id1
 id2   id2   __________________________________________________________
 __________  id3 ______________________________________________________
 _______________   id4   id4   id4   id4   id4  _______________________ 

它还会按月显示：

 jan  feb   mar  apr.........sep oct nov dec
  2    2     2    2....       1   1   1   1

这是使用 mysql 查询总和：

SET @year := 2013;

SELECT
  SUM(CONCAT(@year, '-01-01') BETWEEN date_ini AND date_end) Jan,
  SUM(CONCAT(@year, '-02-01') BETWEEN date_ini AND date_end) Feb,
  SUM(CONCAT(@year, '-03-01') BETWEEN date_ini AND date_end) Mar,
  SUM(CONCAT(@year, '-04-01') BETWEEN date_ini AND date_end) Apr,
  SUM(CONCAT(@year, '-05-01') BETWEEN date_ini AND date_end) May,
  SUM(CONCAT(@year, '-06-01') BETWEEN date_ini AND date_end) Jun,
  SUM(CONCAT(@year, '-07-01') BETWEEN date_ini AND date_end) Jul,
  SUM(CONCAT(@year, '-08-01') BETWEEN date_ini AND date_end) Aug,
  SUM(CONCAT(@year, '-09-01') BETWEEN date_ini AND date_end) Sep,
  SUM(CONCAT(@year, '-10-01') BETWEEN date_ini AND date_end) Oct,
  SUM(CONCAT(@year, '-11-01') BETWEEN date_ini AND date_end) Nov,
  SUM(CONCAT(@year, '-12-01') BETWEEN date_ini AND date_end) `Dec`
FROM
  policies
WHERE
  date_end >= CONCAT(@year, '-01-01')
  AND 
  date_ini <= CONCAT(@year, '-12-01')

这里是链接http://sqlfiddle.com/#!2/dfcd5/2

这是我的控制器：

  @year= params[:year]

  @var =Policy.find_by_sql("SELECT
  SUM(CONCAT(@year, '-01-01') BETWEEN date_ini AND date_end) as jan,
  SUM(CONCAT(@year, '-02-01') BETWEEN date_ini AND date_end) as feb,
  SUM(CONCAT(@year, '-03-01') BETWEEN date_ini AND date_end) as mar,
  SUM(CONCAT(@year, '-04-01') BETWEEN date_ini AND date_end) as apr,
  SUM(CONCAT(@year, '-05-01') BETWEEN date_ini AND date_end) as may,
  SUM(CONCAT(@year, '-06-01') BETWEEN date_ini AND date_end) as jun,
  SUM(CONCAT(@year, '-07-01') BETWEEN date_ini AND date_end) as jul,
  SUM(CONCAT(@year, '-08-01') BETWEEN date_ini AND date_end) as aug,
  SUM(CONCAT(@year, '-09-01') BETWEEN date_ini AND date_end) as sep,
  SUM(CONCAT(@year, '-10-01') BETWEEN date_ini AND date_end) as oct,
  SUM(CONCAT(@year, '-11-01') BETWEEN date_ini AND date_end) as nov,
  SUM(CONCAT(@year, '-12-01') BETWEEN date_ini AND date_end) as `dec`
FROM
  policies
WHERE
  date_end >= CONCAT(@year, '-01-01')
  AND 
  date_ini <= CONCAT(@year, '-12-01')  )"

这是我的看法：

<% form_tag :controller=>"policy_management/policy",:action=>"generate_statistical_report" do %>
    Select year: 
    <%= select_tag "year",options_for_select([ ["2012",2012],["2013",2013],["2014",2014]],params[:year].to_i) %>
    <%= submit_tag "Buscar", :name => nil %>
<% end %>

<%= @var[0].try(:jan)  %>

这是我的日志：

  Policy Load (3.2ms)   SELECT
         SUM(CONCAT(@year, '-01-01') BETWEEN date_ini AND date_expired) as jan,
         SUM(CONCAT(@year, '-12-01') BETWEEN date_ini AND date_expired) `Dec`
        FROM
         policies
        WHERE
         date_expired >= CONCAT(@year, '-01-01')
         AND 
         date_ini <= CONCAT(@year, '-12-01')

在我看来，我的选择框没有传递我的参数@year

请问有人可以帮我解决这个问题吗？

我将非常感谢您的帮助或想法。

Answer 1

你需要使用字符串插值"#{@year}"