rails，simple_form，如何在页面加载时设置集合的选定索引? [英] rails, simple_form, how to set selected index of a collection when page loaded?

问题描述

我正在使用 simple_form gem，我有一个国家集合，当我选择国家时它工作正常，更新的记录将存储国家 ID，但是，当我尝试编辑记录时，未选择所选国家默认在编辑表单.

I am using simple_form gem, I have a countries collection, it work fine when I select the country, and updated record will have the country id stored, but, when I try to edit the record, the chosen country is not selected by default at edit form.

这是编辑表单中的代码:

Here is the code at edit form:

= f.input :country_id, :collection => all_countries

simple_form 不应该从数据库中查看选定的国家吗?

Shouldn't simple_form view the selected country from the db ?

推荐答案

您是否尝试过使用 :selected => 选项?

Have you tried to use the :selected => option?

:selected => selected_country_id

所以，

= f.input :country_id, :collection => all_countries, :selected => selected_country_id

这将完美运行！！！

干杯！

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