字符串"true"；和“假"布尔值

问题描述：

我有一个Rails应用程序，并且正在使用jQuery在后台查询我的搜索视图.有字段q(搜索词)，start_date，end_date和internal. internal字段是一个复选框，我正在使用is(:checked)方法来构建要查询的网址:

I have a Rails application and I'm using jQuery to query my search view in the background. There are fields q (search term), start_date, end_date and internal. The internal field is a checkbox and I'm using the is(:checked) method to build the url that is queried:

$.getScript(document.URL + "?q=" + $("#search_q").val() + "&start_date=" + $("#search_start_date").val() + "&end_date=" + $("#search_end_date").val() + "&internal=" + $("#search_internal").is(':checked'));

现在我的问题出在params[:internal]中，因为有一个包含"true"或"false"的字符串，我需要将其强制转换为布尔值.我当然可以这样:

Now my problem is in params[:internal] because there is a string either containing "true" or "false" and I need to cast it to boolean. Of course I can do it like this:

def to_boolean(str)
     return true if str=="true"
     return false if str=="false"
     return nil
end

但是我认为必须有一种更Ruby的方式来解决这个问题！不是吗??

But I think there must be a more Ruby'ish way to deal with this problem! Isn't there...?

答

据我所知，没有将字符串强制转换为布尔值的内置方法，但是如果您的字符串仅包含'true'和'false'，则可以将方法缩短为以下内容:

As far as i know there is no built in way of casting strings to booleans, but if your strings only consist of 'true' and 'false' you could shorten your method to the following:

def to_boolean(str)
  str == 'true'
end

字符串"true"；和“假"布尔值

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