1,Enumerable#group_by():
<%
employees = Employee.find(:all).group_by{|employee|
employee.title
}
%>
<% employees.each do |title, people| %>
<h2><%= title %></h2>
<ul>
<% people.each do |person| %>
<li><%= person.name %></li>
<% end %>
</ul>
<% end %>
2,Array#in_groups_of()
<table class="calendar">
<% (1..DAYS_IN_MARCH).to_a.in_groups_of(7) do |group| %>
<tr>
<% group.each do |day| %>
<td><%= day %></td>
<% end %>
</tr>
<% end %>
</table>
Array#in_groups_of()可以有第二个参数,当一个group的某几个为空时值为该参数,否则为nil
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