Rails的：如何排序/重新排序的OrderedHash

Question

我有一個OrderedHash，從看起來像這樣的答案here產生：

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

所以，我需要通過第二個值到哈希排序，在降序。我試過這個：

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

我該如何重新訂購OrderedHash？

Answer 1

那麼，我認爲你可以簡單地使用:order => 'sum_deal_price ASC'在sum調用原始答案。

但你也可以做到在Ruby中，它只是有點棘手：

# 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]