首页 > 解决方案 > 转换为 DateTime 方法切断列表呈现(Rails)

问题描述

在我看来,我正在使用一种 ApplicationHelper 方法,该方法将 Time 对象转换为“人性化”时间测量:

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

它工作得很好,但是在翻译旨在列出指定位置的时间间隔的方法的最终结果时遇到了问题:

RFID标签.rb:

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

产品.rb:

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

查看:(html.erb):

将值放在那里first_staged_tag是可行的,并按预期列出值,但它只在几秒钟内完成:

 <% @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%>

在以通常的方式转换时<td><%= humanize_seconds(product.first_staged_tag) %></td>,对于单个值有效,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 Product 模型first_staged_tag方法中应用该方法会在 上生成 NoMethod 错误humanize_seconds。如何获取时间列表以识别时间转换?

所有尝试的迭代都在评论中。

标签: ruby-on-railsrubyoopdatetimeerb

解决方案


解决了!标签必须映射到 Product 模型中,并在那里转换:

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

然后在整个视图中再次迭代:

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

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