Question

我正在尝试循环并匹配以下字符串：

@custom_channels = { cnn: 2, abc: 90 }

然后我希望能够检查/匹配每个并返回频道号码（例如90）：

listen_for /channel to (#{@custom_channels.join('|')})/i do |name|
    change_channel @custom_channels[name.downcase]
end

我一直收到以下错误：

scraper.rb:5:in `<main>': undefined method `join' for {:cnn=>2, :abc=>90}:Hash (NoMethodError)

Answer 1

试试这个：

1.9.3p0 :007 >   channels = {:cnn=>2, :abc=>90}
 => {:cnn=>2, :abc=>90} 
1.9.3p0 :008 > channels.keys
 => [:cnn, :abc] 
1.9.3p0 :009 > channels.keys.each do |name|
1.9.3p0 :010 >     puts channels[name]
1.9.3p0 :011?>   end
2
90
 => [:cnn, :abc]

Answer 2

如果我理解你的要求：

@custom_channels = { cnn: 2, abc: 90 }

channel_names = @custom_channels.keys.map(&:to_s)

listen_for /channel to (#{Regexp.union(channel_names)})/i do |name|
    change_channel @custom_channels[name.to_sym]
end

Ruby / Rails - 未定义方法连接时出错

2 个答案: