ruby 整数到布尔值
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ruby integer to boolean
提问by Rafael
I have a DB field that is integer type and values are always 0 or 1. How do I grab the equivalent boolean value in ruby? such that when i do the following the check box is set appropriately:
我有一个整数类型的 DB 字段，值始终为 0 或 1。如何在 ruby 中获取等效的布尔值？这样当我执行以下操作时，复选框会被适当设置：
<%= check_box_tag 'resend', @system_config.resend %>
回答by Jarrett Meyer
You could use the zero?method. It returns true if 0. If you need to backwards, you could easily negate it to !@system_config.resend.zero?. Or you could extend the Fixnum class, adding a to_b?method, since everything is open and extensible in dynamic languages.
你可以用这个zero?方法。如果为 0，则返回 true。如果您需要向后，您可以轻松地将其否定为!@system_config.resend.zero?。或者您可以扩展 Fixnum 类，添加一个to_b?方法，因为在动态语言中一切都是开放和可扩展的。
class Integer
def to_b?
!self.zero?
end
end
Ruby API: http://ruby-doc.org/core/classes/Fixnum.html#M001050
Ruby API：http: //ruby-doc.org/core/classes/Fixnum.html#M001050
回答by Chuck
1 is your only truth value here. So you can get the boolean truth value with number == 1.
1 是这里唯一的真值。因此，您可以使用number == 1.
回答by gspoosi
I had the same problem and dealt with it this way:
我遇到了同样的问题并以这种方式处理：
def to_boolean(var)
case var
when true,'true',1,'1'
return true
when false, 'false',0,'0'
return false
end
end
This works with forms, databases and people who don't know ruby. I found it to be useful especially with Rails, since parameters are often passed/interpreted as strings and I don't want to worry about that.
这适用于表单、数据库和不了解 ruby 的人。我发现它对 Rails 尤其有用，因为参数通常作为字符串传递/解释，我不想担心这一点。
