为什么是 :required =>真的不在 collection_select 上工作吗? [英] Why is :required => true not working on collection_select?

问题描述

我想确保用户在提交之前在我的表单中选择了一个类别，但是 :required =>true 似乎不起作用.这是选择:

I want to make sure the user selects a category in my form before they can submit it, but :required => true doesn't seem to be working. Here's the select:

<%= f.collection_select :category_id, Category.all, :id, :name, :prompt => 'Choose a category' %>

有什么建议吗?

推荐答案

试试这个

<%= f.collection_select(:category_id, Category.all, :id, :name, {:prompt => 'Choose a category'}, {:required => true}) %>

说明:

根据 Rails 文档，collection_select 函数的语法如下所示:

According to the Rails documentation the syntax for the collection_select function looks like this:

collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})

根据语法，options 和 html_options 是散列，因此您需要将它们括在大括号中.

As per the syntax options and html_options are hashes, so you need to enclose them in braces.

参考 - http://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/collection_select

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