jRuby / Rails 按另一个哈希值对哈希进行排序
我有一个哈希，它将根据特定变量以不同的方式呈现我的 html。该变量位于哈希值内。所以我想知道如何将哈希值传递给分组依据。对其余的内容进行排序是我正在尝试的，也许这会比我的措辞更好地解释它。
<% grouped = svcs.group_by { |svc| svc[val[:sorttype]] } %>
val 是多维哈希。前 2 个键值对 sorttype 和另一个是简单的键和值，第三部分 (svcs) 包含 2D 哈希的等效项。如果我手动输入我想要应用于该组的排序类型，即：
<% grouped = svcs.group_by { |svc| svc[:service_name] } %>
在 PHP 中，我知道在类似的实例中，我可以将某种变量传递给类似的东西并让它工作。我想这里就是这种情况。但是我不确定如何放入变量。因为我尝试过的所有方法都不起作用
I have a hash that will render my html differently based on a particular variable. The variable is within the hash. So I am wondering how I can pass a hash value to a group by. to sort the rest heres what I am trying, maybe this will explain it better than me wording it.
<% grouped = svcs.group_by { |svc| svc[val[:sorttype]] } %>
val is a multidimensional hash. the first 2 key value pairs sorttype and one other are simple key and value, the 3rd piece (svcs) contains the equivilent of a 2D hash. Which if I manually type the type of sort I want to apply to it for the group by it works ie:
<% grouped = svcs.group_by { |svc| svc[:service_name] } %>
in PHP i know in a similar instance I can pass a variable of some sort to something like this and have it work. I assume such is the case here. However Im not sure how to put the variable in. Cause all the ways Ive tried don't work
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这取决于一点。
Rails 有一个
HashWithIn DifferentAccess，它不会区分字符串和符号键；如果您使用其中之一，它应该按原样工作。如果不是，则取决于
val条目是什么 - 如果它们是字符串，请使用to_sym转换为符号，例如svc[val[:排序类型].to_sym]。It depends a little.
Rails' has a
HashWithIndifferentAccessthat will not distinguish between string and symbol keys; if you're using one of those, it should work as-is.If it's not, it depends what the
valentries are--if they're strings, convert to a symbol usingto_sym, e.g.,svc[val[:sorttype].to_sym].