在Ruby中如何更换重音拉丁字符的？ [英] How do I replace accented Latin characters in Ruby?

问题描述

我有一个的ActiveRecord 模式，富，其中有一个名称字段。我希望用户能够按名称搜索，但我想搜索忽略大小写和任何口音。因此，我还存储 canonical_name 针对其搜索领域：

I have an ActiveRecord model, Foo, which has a name field. I'd like users to be able to search by name, but I'd like the search to ignore case and any accents. Thus, I'm also storing a canonical_name field against which to search:

class Foo
  validates_presence_of :name

  before_validate :set_canonical_name

  private

  def set_canonical_name
    self.canonical_name ||= canonicalize(self.name) if self.name
  end

  def canonicalize(x)
    x.downcase.  # something here
  end
end

我需要填写的东西在这里来代替重音符号。有什么比

I need to fill in the "something here" to replace the accented characters. Is there anything better than

x.downcase.gsub(/[àáâãäå]/,'a').gsub(/æ/,'ae').gsub(/ç/, 'c').gsub(/[èéêë]/,'e')....

和，对于这个问题，因为我不是在Ruby 1.9的，我不能把这些统一code文字在我的code。实际经常EX pressions会显得更恶心。

And, for that matter, since I'm not on Ruby 1.9, I can't put those Unicode literals in my code. The actual regular expressions will look much uglier.

推荐答案

Rails有已经一个内建的正火，你只需要使用这个标准化的字符串，形成KD和删除其他字符是这样的：

Rails has already a builtin for normalizing, you just have to use this to normalize your string to form KD and remove the other chars like this:

>> "àáâãäå".chars.normalize(:kd).gsub(/[^\x00-\x7F]/n,'').downcase.to_s
=> "aaaaaa"

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