我正在尝试使用has_scope通过我的KeyRoomMapping表过滤所有未连接到Room的键。
我已在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 %>
答案 0 :(得分:1)
向boolean
添加has_scope
选项,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)