Ruby Float to String错误

Question

Ruby新手.这段代码出了什么问题？

city_details['longitude'] + "," + city_details['latitude']

我收到此错误:

./player_location.rb:6:in `+': String can't be coerced into Float (TypeError)

Answer 1

它看起来像city_details['longitude']和city_details['latitude']的Float值.

你不能像这样添加Float到StringRuby中.您可以将所有内容转换为String,然后将+它们转换为或使用字符串插值.

city_details['longitude'].to_s + "," + city_details['latitude'].to_s

"#{city_details['longitude']},#{city_details['latitude']}"

大多数Rubyist倾向于使用String插值.

Answer 2

它抱怨你正在尝试连接a float和a string.

更好的方法是执行字符串插值:

"#{city_details['longitude']}, #{city_details['latitude']}"

其他可能的方案:

• 你可以通过调用这样的to_s方法将每个float转换为字符串:

  city_details['longitude'].to_s + "," + city_details['latitude'].to_s

• 或者你可以使用这个join方法:

  [city_details['longitude'], city_details['latitude']].join(",")