Active Admin 下拉菜单未显示 rails 4

Question

我有一个带有负载模式的简单应用程序，我添加了 Active Admin gem，它运行良好，但是当我尝试从 Active Admin UI 编辑负载时，它没有从我的某些字段中显示下拉列表：

我的加载表单

<div class="form-row">
  <div class="field">
    <%= f.input :name, label: "Tittle", placeholder: 'Give A Tittle To Your Shipment' %>
  </div>
</div>

<div class="form-row">
  <div class="field">
    <%= f.input :description, label: "Description", placeholder: 'Define Your Shipment' %>
  </div>
</div>

<div class="pickup">
  <div class="form-row">
    <div class="field">
      <span class="fa fa-map-marker"></span>
      <%= f.input :from, :collection => ["Kolkata"],
:input_html => {:class => 'selectpicker'}, :label => 'Pickup (City)', :prompt => 'Select Pickup City' %>
    </div>
  </div>
</div>

<div class="delivery">
  <div class="form-row">
    <div class="field">
      <span class="fa fa-map-marker"></span>
      <%= f.input :to, :collection => ["Kolkata", "Mumbai", "Delhi"],
:input_html => {:class => 'selectpicker'}, :label => 'Delivery (City)', :prompt => 'Select Delivery City' %>
    </div>
  </div>
</div>

admin_user.rb

class AdminUser < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, 
         :recoverable, :rememberable, :trackable, :validatable
end

发货模式

class Shipment < ActiveRecord::Base
    include PublicActivity::Model
    tracked owner: ->(controller, model) { controller && controller.current_user }
    acts_as_votable
    belongs_to :user
    has_many :comments, :dependent => :delete_all
    has_attached_file :image, styles: { medium: "300x300#" }, :default_url => "missing.jpg"
  validates_attachment_content_type :image, content_type: /\Aimage\/.*\Z/
end

主动式运输模式

ActiveAdmin.register Shipment do

# See permitted parameters documentation:
# https://github.com/activeadmin/activeadmin/blob/master/docs/2-resource-customization.md#setting-up-strong-parameters
#
 permit_params :list, :of, :attributes, :on, :model, :name, :description, :from, :to, :date, :pay, :status, :image
#
# or
#
# permit_params do
#   permitted = [:permitted, :attributes]
#   permitted << :other if resource.something?
#   permitted
# end
end

Answer 1

我想你忘了添加 :as=> select 示例代码如下：

f.input :from, :as => :select, :collection => ["Kolkata","Mumbai"]