Ruby on rails 在Rails中的has_many到中添加附加属性

我成立了以下协会：

class BookLaunch < ApplicationRecord
  has_many :book_launch_locations, dependent: :destroy
  has_many :stores, through: :book_launch_locations
    
....

class Store < ApplicationRecord

  has_many :book_launch_locations
  has_many :book_launch, through: :book_launch_locations

....

class BookLaunchLocation < ApplicationRecord
  belongs_to :book_launch, :touch => true
  belongs_to :store
end

我想将

book\u price

添加到BookLaunch模型中的商店中，以便在调用

@book\u launch.stores

，它将具有stores的所有属性+

book\u price

属性

这可能吗

我用fastJsonApi这样称呼它：

    options = {
      include: [:book_launch, :'book_launch.properties']}
    json = Api::launchSummarySerializer.new(summaryData, options).serialized_json

    render json: json

---

如果要创建包含两个以上外键列的联接模型行，则需要显式地而不是隐式地创建它

隐式创建联接模型行是指通过间接关联创建联接模型行：

Store.first.book_launches.create!(attributes)
BookLaunch.first.stores.create!(attributes)

---

抱歉，我对rails真的很生疏。我只有一个控制器，可以找到一个特定的book_launch并返回book_launch.stores。我只想在返回book_launch.stores时包含book_price属性。你是说这将通过我创建它的方式来解决吗？你在处理问题时真的错了。您要做的是遍历

book\u launch\u locations

关联<代码>book|u launch.book|u launch|u locations.each{bll |放置“{bll.store.name}:{bll.price}”}。如果你能找到一个更好的名字，这段代码就不会那么尴尬了。我只是用我的名字更新了我的代码。是的，名字不好。因此，听起来我无法将门店与book_launch_位置的属性价格结合起来。我得分别打两个电话

store = Store.first
book_launch = BookLaunch.first

BookLaunchLocation.create(
  store: store,
  book_launch: book_launch,
  price: 999
)

# or
store.book_launch_locations.create(
  book_launch: book_launch,
  price: 999
)

# or
book_launch.book_launch_locations.create(
  store: store,
  price: 999
)

Store.first.book_launches.create!(attributes)
BookLaunch.first.stores.create!(attributes)