Ruby on Rails 4 选择多个 [英] Ruby on Rails 4 select multiple

问题描述

我有一个创建新用户的表单.我正在尝试添加一个下拉选项来选择权限级别.我希望能够为每个用户选择多个权限级别.

I have a form that creates new users. I am trying to add a drop down option to select permission levels. I want to be able to select multiple permission levels per user.

这是我的观点，我添加了 {:multiple =>真} :

This is my view, I added {:multiple => true} :

<%= f.label :permission, "Permission Level" %>
<%= f.select :permission, [ ["Read Only", "read"], ["IP Voice Telephony", "ip_voice"], ["IP Video Telephony", "ip_video_telephony"], ["Enterprise Gateways", "enterprise_gateways"], ["Consumer ATAs", "consumer_atas"], ["IP PBX", "ip_pbx"], ["Master of All", "all"] ], {prompt: "Select Permission Level"}, {:multiple => true}, class: "input-lg" %>

我的控制器，我添加了 :permission =>[] :

My controller, I added :permission => [] :

def user_params
  params.require(:user).permit(:name, :email, :password, :password_confirmation, :admin, :permission => [])
end

我的视图错误，f.select:

The error I get for my view, f.select:

wrong number of arguments (5 for 2..4)

如何为 Rails 4 选择多个?

How do you make a select multiple for Rails 4?

推荐答案

class 和 multiple 都是 html_options 的一部分，所以它们应该放在一个散列中.

class and multiple are both part of html_options, so they should go together in a single hash.

改变

<%= f.select :permission, [ ["Read Only", "read"], ["IP Voice Telephony", "ip_voice"], ["IP Video Telephony", "ip_video_telephony"], ["Enterprise Gateways", "enterprise_gateways"], ["Consumer ATAs", "consumer_atas"], ["IP PBX", "ip_pbx"], ["Master of All", "all"] ], {prompt: "Select Permission Level"},
{:multiple => true}, class: "input-lg" %>

到

<%= f.select :permission, [ ["Read Only", "read"], ["IP Voice Telephony", "ip_voice"], ["IP Video Telephony", "ip_video_telephony"], ["Enterprise Gateways", "enterprise_gateways"], ["Consumer ATAs", "consumer_atas"], ["IP PBX", "ip_pbx"], ["Master of All", "all"] ], {prompt: "Select Permission Level"},
{:multiple => true, class: "input-lg"} %>

现在您分别传递它们.所以，select 方法的参数计数变成了 5，而它应该是 4.因此，错误.

Right now you are passing them separately. So, the argument count for select method is becoming 5 when it should be 4. Hence, the error.

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