ruby-on-rails - 选择具有多个预选值的标签 - 在数据库中手动插入的值

Question

我需要在 select_tag 中预先选择多个值。但我在表格空缺中“手动”添加空缺，如下所示:

我的 Controller :

def create
  @hr_curriculum_generic = HrCurriculumGeneric.new(params[:hr_curriculum_generic])

  if params[:vacancy_ids].present?
    @vacancies_ids = params[:vacancy_ids]

-- 我的表单:

  @vacancies_ids.each do |vacancy_id|
    # Armazena os id do curriculum, vaga e do cargo na tabela CandidatosxVagas
    @candidates_vacancies = CandidatesVacancy.new 
    <% @vacancies = Vacancy.all %>
    <%= select_tag "vacancy_ids[]", options_from_collection_for_select(Vacancy.all, "id", "title"), :multiple => true, :id => "vacancy_ids", :class => "form-control" %>

.....

它有效，但是当我点击编辑按钮时，字段没有被预选。

Answer 1

options_from_collection_for_select有 4 个参数:

• 收藏
• 编号
• 专栏
• 已选择

您可以提供单个值或散列来表示选定的值。试试这个:

<%= select_tag "vacancy_ids[]", options_from_collection_for_select(Vacancy.all,"id","title",{:selected=>[1,2,3,4]})), :multiple => true, :id => "vacancy_ids", :class => "form-control" %>

我不确定您尝试选择的值来自何处，但将它们通过管道传输到选定的哈希中。