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在redmine安装目录\app\views\attachments\_links.html.erb的最后面增加以下内容：
<% images = attachments.select { |a| a.image? } %>
<% unless images.empty? %>
<div class='images'>
<% images.each do |attachment| %>
<%= link_to image_tag(url_for({:controller => 'attachments', :action => 'show', :id => attachment, :filename => attachment.filename })),
{:controller => 'attachments', :action => 'show', :id => attachment, :filename => attachment.filename }, :class => 'lightbox', :rel => 'attachments', :title => "#{attachment.filename}#{ ('-' + attachment.description) unless attachment.description.blank? }" %>
<% end -%>
</div>
<% end -%>
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