可以简单点 2018-09-01 03:56 采纳率: 80%
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rails 使用sort_by方法根据数组里面的某个属性进行排序,但是这个属性有空值

<% issues.sort_by{|u| u.due_date}.each do |issue| %>
<%= render partial: 'tree_node', :locals => {:issue => issue, :query => query, :issues_ids => issues_ids} %>
<% end %>
上面的代码中u.due_date有空值,
报的错误是:
ActionView::Template::Error (comparison of NilClass with Date failed):
22: <% end %>
23:
24:
25:


26: <% issues.sort_by{|u| u.due_date}.each do |issue| %>
27: <%# issues.each do |issue| %>
28: <%= render partial: 'tree_node', :locals => {:issue => issue, :query => query, :issues_ids => issues_ids} %>
请教一下各位大神,有什么好的解决方案吗,既按照due_date排序,又解决due_date有空值的问题。
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