在Rails 4中對嵌套屬性進行多重選擇

Question

我有這個代碼

class Department < ActiveRecord::Base
   has_many :admin_permissions
   accepts_nested_attributes_for :admin_permissions
end

視圖：

= ep.fields_for :department, dept_object do |dept|
    = dept.fields_for :admin_permissions, @user.admin_permissions.new(department: dept.object) do |ap|
      = ap.collection_select :permission_type, AdminPermission.permission_types.map{ |dp| [dp.first, dp.first.humanize] }, :first, :second, {}, { :multiple => true, class: 'form-control' }

但是在按下“提交”按鈕后的參數中，參數如下所示：

"department_attributes"=>
  {"company_id"=>"2",
   "name"=>"",
   "admin_permissions_attributes"=>{"0"=>{"permission_type"=>["", "human_resource"]}}},

代替

"department_attributes"=>
  {"company_id"=>"2",
   "name"=>"",
   "admin_permissions_attributes"=>{"0"=>{"permission_type"=>"hr"}, "1" => {"permission_type" => "manager"}}}

如何通過多項選擇實現這一目標？ 謝謝！

Answer 1

您的語法看起來正確，但是您可以嘗試將：multiple刪除

ap.collection_select :permission_type, AdminPermission.permission_types.map{ |dp| [dp.first, dp.first.humanize] }, :first, :second, {}, :multiple => true

但是結果將始終為以下形式

"admin_permissions_attributes"=>{"0"=>{"permission_type"=>["", "human_resource", "management"]}}}

它們將沒有各自的ID，但將作為列表傳遞。