为什么:required =>对collection_select无效?

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:

我想确保用户在提交表单之前选择了一个类别，但是:required => true似乎不起作用。这里的选择:

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

Any advice?

任何建议吗?

1 个解决方案

#1

Try this

试试这个

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

Explanation:

解释:

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

根据Rails文档，collection_select函数的语法如下所示:

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

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

根据语法选项和html_options是散列，所以需要将它们括在大括号中。

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

引用——http://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/collection_select

#1