Ruby-on-rails Rails：从哈希数组中删除元素
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Rails: Remove element from array of hashes
提问by MorningHacker
I have the following array:
我有以下数组：
array = [{"email"=>"[email protected]", "name"=>"Test"},
{"email"=>"[email protected]", "name"=>"Test A"},
{"name"=>"Test B", "email"=>"[email protected]"},
{"email"=>"[email protected]", "name"=>"Test C"},
{"name"=>"Test D", "email"=>"[email protected]"},
{"email"=>"[email protected]"},
{"name"=>"Test F", "email"=>"[email protected]"}]
I have a list of "blacklist" emails, for instance:
我有一个“黑名单”电子邮件列表，例如：
blacklist = ["[email protected]"]
I want to do something like this:
我想做这样的事情：
array - blacklist
# => should remove element {"email"=>"[email protected]", "name"=>"Test C"}
Surely there is a sexy-Ruby way to do this with .select or something, but I haven't been able to figure it out. I tried this to no avail:
当然，使用 .select 或其他东西有一种性感的 Ruby 方式来做到这一点，但我一直无法弄清楚。我试过这个无济于事：
array.select {|k,v| v != "[email protected]"} # => returns array without any changes
回答by mu is too short
I think you're looking for this:
我想你正在寻找这个：
filtered_array = array.reject { |h| blacklist.include? h['email'] }
or if you want to use selectinstead of reject(perhaps you don't want to hurt anyone's feelings):
或者如果你想使用select而不是reject（也许你不想伤害任何人的感情）：
filtered_array = array.select { |h| !blacklist.include? h['email'] }
Your
您的
array.select {|k,v| ...
attempt won't work because array hands the Enumerable blocks a single element and that element will be a Hash in this case, the |k,v|trick would work if arrayhad two element arrays as elements though.
尝试将不起作用，因为数组将 Enumerable 块传递给单个元素，并且在这种情况下该元素将是 Hash，|k,v|如果array有两个元素数组作为元素，该技巧将起作用。
