def all
  @order = params[:order] || "number"
  sort_proc = case @order
    when "author" then lambda {|r| [r.user.name.downcase, r.number]}
    when "status",
             "title", then lambda {|r| [r.send(@order).downcase, r.number]}
    when "number" then lambda {|r| -r.number}
  end
  @rcrs = Rcr.find(:all).sort_by &sort_proc
end

下面是一个 respond_to? 和 send 方法的例子

request = gets.chomp

if ticket.respond_to?(request)
  puts ticket.send(request)
else
  puts "No such information available"
end

参数的默认值

def m(a, b=1, *m)
end

m(1,2,3,4)

a = 1, b = 1, m = [3, 4]

标签 : r4r , rails

原文链接 : http://railser.cn/blog/ruby-for-rails-1

转载原创文章请注明 : 里克的自习室

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