如何使用rails3创建范围以获取最后十个事务

Question

尝试将范围添加到我的事务模型以返回created_at的最后10个事务

Answer 1

scope :most_recent, order(created_at: :desc).limit(10)

Answer 2

使用范围

# Ruby 1.8 style
scope :recent, lambda { |num| order('created_at DESC').limit(num) }

# Ruby 1.9/2.0 style
scope :recent, ->(num) { order('created_at DESC').limit(num) }

用法示例:

<% Organization.recent(10).each do |organization| %>
  <li><% link_to organization.name, organization %></li>
<% end %>