多選擇在軌嵌套屬性4

Question

我有這樣的代碼

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

查看：

= 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' } 

但在提交按鈕被按下後的參數，可以在PARAMS是這樣的：

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

而不是

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

我怎樣才能實現這與多選擇？謝謝！

Answer 1

你的語法看起來是正確的，但你可以嘗試刪除：多出來的括號

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

，但結果總是會在形式

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

他們將不會有他們自己的ID，但會作爲列表傳遞。