Ruby on rails 以简单形式关联的If/Else-Rails

我正在创建一个工作公告板，其中每个工作公告都有相关的区域>州>城市。发布可以有任意数量的区域、州或城市组合

我的区域架构如下所示：

  create_table "regions", force: :cascade do |t|
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.integer  "parent"
    t.string   "name"
    t.string   "role"
  end

  def new
    @posting = current_user.recruiter_postings.build
    @major_regions = Region.where(:role => "region")
    @state_regions = Region.where(:role => "state")
    @city_regions = Region.where(:role => "city")
  end

我的

new

操作与我的

posting

控制器类似：

  create_table "regions", force: :cascade do |t|
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.integer  "parent"
    t.string   "name"
    t.string   "role"
  end

  def new
    @posting = current_user.recruiter_postings.build
    @major_regions = Region.where(:role => "region")
    @state_regions = Region.where(:role => "state")
    @city_regions = Region.where(:role => "city")
  end

我正在尝试使用区域、州（其中

state.parent==region.id

）和城市（其中

city.parent==state.id

）创建一个手风琴风格的复选框选择器

例如：

区域使用联接表关联到my Postings ActiveRecord

这是我的

发布

型号：

class Posting < ActiveRecord::Base
  mount_uploader :avatar, AvatarUploader

  belongs_to :recruiter, class_name: "User"
  belongs_to :company
  has_many :interests
  has_many :comments, as: :commentable
  has_and_belongs_to_many :job_types
  has_and_belongs_to_many :industries
  has_and_belongs_to_many :regions
  has_and_belongs_to_many :market_caps
  has_and_belongs_to_many :ownerships
  has_many :users, through: :interests
  acts_as_followable
end

class Region < ActiveRecord::Base
  has_and_belongs_to_many :postings
  has_and_belongs_to_many :news_items
  has_and_belongs_to_many :mkt_ints
  has_and_belongs_to_many :companies
  has_and_belongs_to_many :users
end

在我的

postings/_form.html.haml

文件中，我需要显示所有适当的复选框region>States>Cities，并允许通过关联保存它们：

  %ul.major-region-ul
  - @major_regions.each do |region|
    %li
      = f.label :regions, region.name
      = f.check_box :regions
      - @state_regions.each do |state|
        -if state.parent === region.id
          %ul.state-region-ul
            %li
              = f.label :regions, state.name
              = f.check_box :regions
              - @city_regions.each do |city|
                -if city.parent === state.id
                  %ul.city-region-ul
                    %li
                      = f.label :regions, city.name
                      = f.check_box :regions

当我将它们设置为复选框（如上所示）时，它们会正确显示，但不会保存。当我尝试将它们显示并另存为关联时：

  %ul.major-region-ul
  - @major_regions.each do |region|
    %li
      = f.label :regions, region.name
      = f.association :regions
      - @state_regions.each do |state|
        -if state.parent === region.id
          %ul.state-region-ul
            %li
              = f.label :regions, state.name
              = f.association :regions
              - @city_regions.each do |city|
                -if city.parent === state.id
                  %ul.city-region-ul
                    %li
                      = f.label :regions, city.name
                      = f.association :regions

编辑

帮助解决了这个问题

---

我得到了#

---

但是现在它为

if else

语句中的每个成功生成每个

区域

，这仍然是一个我不知道如何处理的大问题，我希望得到帮助

这是我的应用程序跟踪：

app/views/postings/_form.html.haml:13:in `block (2 levels) in _app_views_postings__form_html_haml__3504097481979586058_2278688540'
app/views/postings/_form.html.haml:10:in `block in _app_views_postings__form_html_haml__3504097481979586058_2278688540'
app/views/postings/_form.html.haml:3:in `_app_views_postings__form_html_haml__3504097481979586058_2278688540'
app/views/postings/edit.html.erb:1:in `_app_views_postings_edit_html_erb__478558825236209135_2272129060'

我想不出如何做到这两个。维护协会和2。正确显示选项。我可以做其中一个，但不能同时做两个

我感谢你能提供的任何帮助

如果你需要任何进一步的信息，请告诉我

谢谢