假设你的模型类有一个title属性，你可以简单地覆盖模型中的to_param方法，就像这样:

def to_param
  title.downcase.gsub(/ /, '-')
end

Railscast的这集有所有的细节。你也可以使用这个来确保标题只包含有效字符:

validates_format_of :title, :with => /^[a-z0-9-]+$/,
                    :message => 'can only contain letters, numbers and hyphens'

stackoverflow的解决方案是伟大的，但现代浏览器(不包括IE，像往常一样)现在很好地处理utf8编码:

所以我升级了建议的解决方案:

public static string ToFriendlyUrl(string title, bool useUTF8Encoding = false)
{
    ...

        else if (c >= 128)
        {
            int prevlen = sb.Length;
            if (useUTF8Encoding )
            {
                sb.Append(HttpUtility.UrlEncode(c.ToString(CultureInfo.InvariantCulture),Encoding.UTF8));
            }
            else
            {
                sb.Append(RemapInternationalCharToAscii(c));
            }
    ...
}

Pastebin的完整代码

编辑:下面是RemapInternationalCharToAscii方法的代码(在粘贴文件中没有)。

有一个叫PermalinkFu的小Ruby on Rails插件可以做到这一点。escape方法将转换为适合URL的字符串。看一下代码;那个方法很简单。

为了删除非ascii字符，它使用iconv lib将'utf-8'转换为'ascii//ignore//translit'。然后空格变成破折号，所有东西都被缩小，等等。

您需要设置一个自定义路由，将URL指向将处理它的控制器。因为您使用的是Ruby on Rails，这里介绍一下如何使用他们的路由引擎。

在Ruby中，你需要一个你已经知道的正则表达式，下面是要使用的正则表达式:

def permalink_for(str)
    str.gsub(/[^\w\/]|[!\(\)\.]+/, ' ').strip.downcase.gsub(/\ +/, '-')
end

下面是Jeff代码的我的版本。我做了以下修改:

The hyphens were appended in such a way that one could be added, and then need removing as it was the last character in the string. That is, we never want “my-slug-”. This means an extra string allocation to remove it on this edge case. I’ve worked around this by delay-hyphening. If you compare my code to Jeff’s the logic for this is easy to follow. His approach is purely lookup based and missed a lot of characters I found in examples while researching on Stack Overflow. To counter this, I first peform a normalisation pass (AKA collation mentioned in Meta Stack Overflow question Non US-ASCII characters dropped from full (profile) URL), and then ignore any characters outside the acceptable ranges. This works most of the time... ... For when it doesn’t I’ve also had to add a lookup table. As mentioned above, some characters don’t map to a low ASCII value when normalised. Rather than drop these I’ve got a manual list of exceptions that is doubtless full of holes, but it is better than nothing. The normalisation code was inspired by Jon Hanna’s great post in Stack Overflow question How can I remove accents on a string?. The case conversion is now also optional. public static class Slug { public static string Create(bool toLower, params string[] values) { return Create(toLower, String.Join("-", values)); } /// <summary> /// Creates a slug. /// References: /// http://www.unicode.org/reports/tr15/tr15-34.html /// https://meta.stackexchange.com/questions/7435/non-us-ascii-characters-dropped-from-full-profile-url/7696#7696 /// https://stackoverflow.com/questions/25259/how-do-you-include-a-webpage-title-as-part-of-a-webpage-url/25486#25486 /// https://stackoverflow.com/questions/3769457/how-can-i-remove-accents-on-a-string /// </summary> /// <param name="toLower"></param> /// <param name="normalised"></param> /// <returns></returns> public static string Create(bool toLower, string value) { if (value == null) return ""; var normalised = value.Normalize(NormalizationForm.FormKD); const int maxlen = 80; int len = normalised.Length; bool prevDash = false; var sb = new StringBuilder(len); char c; for (int i = 0; i < len; i++) { c = normalised[i]; if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9')) { if (prevDash) { sb.Append('-'); prevDash = false; } sb.Append(c); } else if (c >= 'A' && c <= 'Z') { if (prevDash) { sb.Append('-'); prevDash = false; } // Tricky way to convert to lowercase if (toLower) sb.Append((char)(c | 32)); else sb.Append(c); } else if (c == ' ' || c == ',' || c == '.' || c == '/' || c == '\\' || c == '-' || c == '_' || c == '=') { if (!prevDash && sb.Length > 0) { prevDash = true; } } else { string swap = ConvertEdgeCases(c, toLower); if (swap != null) { if (prevDash) { sb.Append('-'); prevDash = false; } sb.Append(swap); } } if (sb.Length == maxlen) break; } return sb.ToString(); } static string ConvertEdgeCases(char c, bool toLower) { string swap = null; switch (c) { case 'ı': swap = "i"; break; case 'ł': swap = "l"; break; case 'Ł': swap = toLower ? "l" : "L"; break; case 'đ': swap = "d"; break; case 'ß': swap = "ss"; break; case 'ø': swap = "o"; break; case 'Þ': swap = "th"; break; } return swap; } }

关于更多的细节，单元测试，以及为什么Facebook的URL方案比堆栈溢出更聪明的解释，我在我的博客上有一个扩展版本。

我们是这样做的。注意，可能有比你第一眼意识到的更多的边缘条件。

这是第二个版本，展开后的性能提高了5倍(是的，我对它进行了基准测试)。我认为我应该优化它，因为这个函数可以在每页被调用数百次。

/// <summary>
/// Produces optional, URL-friendly version of a title, "like-this-one". 
/// hand-tuned for speed, reflects performance refactoring contributed
/// by John Gietzen (user otac0n) 
/// </summary>
public static string URLFriendly(string title)
{
    if (title == null) return "";

    const int maxlen = 80;
    int len = title.Length;
    bool prevdash = false;
    var sb = new StringBuilder(len);
    char c;

    for (int i = 0; i < len; i++)
    {
        c = title[i];
        if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9'))
        {
            sb.Append(c);
            prevdash = false;
        }
        else if (c >= 'A' && c <= 'Z')
        {
            // tricky way to convert to lowercase
            sb.Append((char)(c | 32));
            prevdash = false;
        }
        else if (c == ' ' || c == ',' || c == '.' || c == '/' || 
            c == '\\' || c == '-' || c == '_' || c == '=')
        {
            if (!prevdash && sb.Length > 0)
            {
                sb.Append('-');
                prevdash = true;
            }
        }
        else if ((int)c >= 128)
        {
            int prevlen = sb.Length;
            sb.Append(RemapInternationalCharToAscii(c));
            if (prevlen != sb.Length) prevdash = false;
        }
        if (i == maxlen) break;
    }

    if (prevdash)
        return sb.ToString().Substring(0, sb.Length - 1);
    else
        return sb.ToString();
}

要查看被替换的代码的前一个版本(但在功能上与之相当，而且快了5倍)，请查看这篇文章的修订历史(单击日期链接)。

另外，RemapInternationalCharToAscii方法的源代码可以在这里找到。