Rails - 在 has_many 上使用 join model 過濾

Question

如何通過關系為鏈接 has_many 的設施在 Place 表上添加過濾器？

這是所有模型的樣子：

class Place < ApplicationRecord
  has_many :facilities, through: :place_facilities
  has_many :place_facilities, dependent: :destroy

class PlaceFacility < ApplicationRecord
  belongs_to :place
  belongs_to :facility
end

class Facility < ApplicationRecord
  has_many :places, through: :place_facilities
  has_many :place_facilities
end

我希望用戶能夠過濾具有特定設施的地方。

Answer 1

使用joins和where非常容易

my_places = Place.joins(:facility).where(facilities: {name: 'blackboard'})

Answer 2

Place.includes(:facilities).where(facilities: { attribute: "specific" })

有關詳細信息，請參閱https://guides.rubyonrails.org/active_record_querying.html#specifying-conditions-on-eager-loaded-associations