Question

我是Rails的新手，我正在尝试将国家放入数组中，然后在选择框中显示它们。我的数组看起来像这样：

country = {}
country[ FR ] =  France 
country[ UK ] =  United Kingdom

有任何想法吗？

Answer 1

在您看来，请执行以下操作：

<%= select_tag  countries , 
            options_for_select(@countries.to_a) %>

The @countries.to_a will transform your hash into a array. If your hash is the following :

{ France  =>  FR ,  United Kingdom  =>  UK }

之后，在 to_a 之后，您将拥有以下数组：

[[ France ,  FR ], [ United Kingdom ,  UK ]]

The options_for_select method takes an array and create the options tags.
When the entry of the array is an array itself, the first entry (France or United Kingdom here) is the value. And the second one is the key (FR or UK here).

select_tag函数创建一个选择标签。

友情链接