转换为DateTime方法会中断列表呈现(滚动)

时间:2018-12-01 00:31:06

标签: ruby-on-rails ruby oop datetime erb

我正在使用ApplicationHelper方法,该方法将Time对象转换为我认为的“人性化”时间度量:

def humanize_seconds s
    if s.nil?
      return ""
    end
    if s > 0
      m = (s / 60).floor
      s = s % 60
      h = (m / 60).floor
      m = m % 60
      d = (h / 24).floor
      h = h % 24
      w = (d / 7).floor
      d = d % 7
      y = (w / 52).floor
      w = w % 52
      output = pluralize(s, "second") if (s > 0)
      output = pluralize(m, "minute") + ", " + pluralize(s, "second") if (m > 0)
      output = pluralize(h, "hour") + ", " + pluralize(m, "minute") if (h > 0)
      output = pluralize(d, "day") + ", " + pluralize(h, "hour") if (d > 0)
      output = pluralize(w, "week") + ", " + pluralize(d, "day") if (w > 0)
      output = pluralize(y, "years") + ", " + pluralize(w, "week") if (y > 0)

      return output
    else
      return pluralize(s, "second")
    end
  end

效果很好,但是在翻译设计用于在指定位置列出时间间隔的方法的最终结果时,我遇到了一个问题:

RFIDTag.rb:

def time_since_first_tag_use
    product_selections.none? ? "N/A" : Time.now - product_selections.order(staged_at: :asc).first.staged_at
  end 

Product.rb:

def first_staged_tag
  rfid_tags.map { |rfid| rfid.time_since_first_tag_use.to_i }.join(", ")
end

查看:(html.erb):

将值放在此处可以正常工作,并且可以按first_staged_tag列出值,但这只能在几秒钟内完成:

 <% @products.order(created_at: :desc).each do |product| %>
   <td><%= product.name %></td> #Single product name
   <td><%= product.first_staged_tag %></td> list, i.e. #40110596, 40110596, 39680413, 39680324
 <%end%>

在按常规方式<td><%= humanize_seconds(product.first_staged_tag) %></td>进行转换时(如对单个值进行的转换)会出现此错误:

comparison of String with 0 failed
Extracted source (around line #88):              
86      return ""
87    end
88    if s > 0
89      m = (s / 60).floor
90      s = s % 60
91      h = (m / 60).floor

同时,尝试在产品模型first_staged_tag中应用该方法会在humanize_seconds上产生NoMethod错误。如何获取时间列表以识别时间转换?

所有尝试的迭代都在注释中。

1 个答案:

答案 0 :(得分:0)

解决了!标签必须在产品模型中进行映射,并在那里进行转换:

#Product.rb 
def first_staged
    rfid_tags.map { |rfid| rfid.time_since_first_tag_use.to_i }
  end

然后再次遍历整个视图中的

<%= product.first_staged.map {|time| humanize_seconds(time) }.join(", ") %>