如何在我的视图中调用/使用我的范围

Question

我正在尝试使用 has_scope 过滤所有未通过我的 KeyRoomMapping 表连接到房间的键。

我已经在我的 Keys 模型中创建了范围，但我不知道如何在我的视图中调用范围。

模型

class Key < ApplicationRecord  

  has_many :key_room_mappings, foreign_key: :key_id, dependent: :destroy
  has_many :rooms, through: :key_room_mappings

  ###Is this the best way to find all Keys that are not connected to a room?
  scope :without_rooms, -> { where.not(id: KeyRoomMapping.distinct.pluck(:key_id)) }

end

class KeyRoomMapping < ApplicationRecord
  belongs_to :room
  belongs_to :key

end

class Room < ApplicationRecord
  has_many :key_room_mappings, foreign_key: :room_id, dependent: :destroy
  has_many :keys, through: :key_room_mappings

end

控制器

class KeysController < ApplicationController

  has_scope :without_rooms

  def index
    @keys = apply_scopes(Key).all
  end

end

查看

###How can I use my scope to filter my list below, this is not working...
<%= link_to "Keys Without Rooms", {controller: 'keys', action: 'index', without_rooms: ''} %>

  <% @keys.each do |key| %>
    <tr>
      <td><%= key.name %></td>
      <td><%= key.copy %></td>
    </tr>
  <% end %>

Answer 1

将boolean 选项添加到has_scope，您将在构建路径时使用该选项：

# controller
has_scope :without_rooms, type: :boolean

# view
link_to "Keys Without Rooms", '/keys?without_rooms=true' # or keys_path(without_rooms: true)