ruby-on-rails - rails : How to sort/re-order an OrderedHash

Question

我有一个 OrderedHash，从答案 here 生成看起来像这样:

<OrderedHash {2=>"534.45",7=>"10",153=>"85.0"}>

所以，我需要按第二个值按降序对哈希进行排序。我试过这个:

var.sort! {|a,b| b[1] <=> a[1]}
NoMethodError: undefined method `sort!' for #<ActiveSupport::OrderedHash:0x127a50848>

如何重新排序此 OrderedHash？

Answer 1

好吧，我想你可以简单地使用 :order => 'sum_deal_price ASC'在 sum调用原始答案。

但是你也可以用 Ruby 来做，只是有点棘手:

# You can't sort a Hash directly, so turn it into an Array.
arr = var.to_a  # => [[2, "534.45"], [7, "10"], [153, "85.0"]]
# Looks like there's a bunch of floats-as-strings in there, fix that.
arr.map! { |pair| [pair.first, pair.second.to_f] }
# Now sort it by the value (which is the second entry of the pair).
arr.sort! { |a, b| a.second <=> b.second }
# Turn it back into an OrderedHash.
sorted_hash = ActiveSupport::OrderedHash[arr]