Question

我有2个型号：

class Book < ActiveRecord::Base
  has_many :book_versions
  accepts_nested_attributes_for :book_versions, allow_destroy: true
  validates_associated :book_versions

class BookVersion < ActiveRecord::Base
  has_many :collection_items
  has_many :collections, through: :collection_items
  belongs_to :book
  validates_presence_of :price, :isbn #<-- validates presence

这是我的参数。请注意我如何将名为price的book_version bb留空。这应该触发validates_presence_of :price模型中的BookVersion验证（但它没有）：

“book”=＆gt; {“title”=＆gt;“zzzzzz”，“subtitle”=＆gt;“”，“author_ids”=＆gt; [“”]，“illustrator_ids”=＆gt; [“”] ，“award_ids”=＆gt; [“”]，“theme_ids”=＆gt; [“”]，“publication_date”=＆gt;“”，“imprint_id”=＆gt;“1”，“language_ids”=＆gt; [“ “]，”eng_vers_id“=＆gt;”“，”book_versions_attributes“=＆gt; {”0“=＆gt; {”book_id“=＆gt;”2848“，”name“=＆gt;”alt“，”isbn“= ＆gt;“”，“price”=＆gt;“”，“famis_number”=＆gt;“”，“famis_price”=＆gt;“”，“weight_in_pounds”=＆gt;“”}，“1”=＆gt; {“ book_id“=＆gt;”2848“，”name“=＆gt;”bb“，”isbn“=＆gt;”123123123123“，”price“=＆gt;”“，”famis_number“=＆gt;”“，”famis_price“ =＆gt;“”，“weight_in_pounds”=＆gt;“1.0”，“库存”=＆gt;“08”，“id”=＆gt;“1030”}，

当我在我的控制器中执行@book.update_attributes(params[:book])时，book_versions都没有更新，即使一切看似有效：

    >> @book.update_attributes(params[:book])
    => true
    >> @book.book_versions
    => [#<BookVersion id: 1030, book_id: 2848, name: "bb", isbn: "123123123123", inventory: "08", price: #<BigDecimal:7fc484885b80,'0.1122E2',18(18)>, famis_price: nil, famis_number: "", weight_in_pounds: #<BigDecimal:7fc4848861c0,'0.1E1',9(18)>, width: nil, height: nil, thickness: nil>, #<BookVersion id: 1031, book_id: 2848, name: "lb", isbn: "12312333333", inventory: "02", price: #<BigDecimal:7fc484886670,'0.2244E2',18(18)>, famis_price: nil, famis_number: "", weight_in_pounds: #<BigDecimal:7fc484886760,'0.1E1',9(18)>, width: nil, height: nil, thickness: nil>, #<BookVersion id: 1032, book_id: 2848, name: "hc", isbn: "111213213131", inventory: nil, price: #<BigDecimal:7fc4848869e0,'0.1212E4',9(18)>, famis_price: nil, famis_number: "", weight_in_pounds: #<BigDecimal:7fc484886d28,'0.1E1',9(18)>, width: nil, height: nil, thickness: nil>]
    >> @book.book_versions.map(&:price)
    => [#<BigDecimal:7fc484885b80,'0.1122E2',18(18)>, #<BigDecimal:7fc484886670,'0.2244E2',18(18)>, #<BigDecimal:7fc4848869e0,'0.1212E4',9(18)>]
    >> @book.book_versions.map(&:price).map(&:to_f)
    => [11.22, 22.44, 1212.0]
    >> @book.save
    => true
    >> @book.book_versions.map(&:price).map(&:to_f)
    => [11.22, 22.44, 1212.0] #<-- one of these should be `nil`.

发生了什么事？当我创建一个包含许多Book的{{1}}时，表单完全正常。但是，当我使用现有图书版本更新现有图书时，它不会更新或验证任何内容。

这是我的问题的延续：ActiveRecord: validates_associated does not work when updating model?

更新====

呃......我认为这是铁轨中的一个错误？看看会发生什么：

BookVersion

但这只是在我使用更好的错误并在>> @book.update_attributes(params[:book]) => true >> @book.book_versions => [#<BookVersion id: 1030, book_id: 2848, name: "bb", isbn: "123123123123", inventory: "08", price: #<BigDecimal:7fc487ee9488,'0.1122E2',18(18)>, famis_price: nil, famis_number: "", weight_in_pounds: #<BigDecimal:7fc487ee9118,'0.1E1',9(18)>, width: nil, height: nil, thickness: nil>, #<BookVersion id: 1031, book_id: 2848, name: "lb", isbn: "12312333333", inventory: "02", price: #<BigDecimal:7fc487ee8f88,'0.2244E2',18(18)>, famis_price: nil, famis_number: "", weight_in_pounds: #<BigDecimal:7fc487ee8e98,'0.1E1',9(18)>, width: nil, height: nil, thickness: nil>, #<BookVersion id: 1032, book_id: 2848, name: "hc", isbn: "111213213131", inventory: nil, price: #<BigDecimal:7fc487ee8b50,'0.1212E4',9(18)>, famis_price: nil, famis_number: "", weight_in_pounds: #<BigDecimal:7fc487ee89c0,'0.1E1',9(18)>, width: nil, height: nil, thickness: nil>] >> @book.update_attributes(params[:book]) => false之前冻结控制器时。当我在更新属性并尝试运行它之前实际将update_attributes放入控制器时，它仍然不起作用。

Answer 1

所以我想出了一些hackery ...出于某种原因你必须首先将它们加载到内存中。为了做到这一点，你必须在书籍版本的数组上执行某种功能。仅仅呼叫book.book_versions是不够的：

  @book.book_versions.sort_by(&:name) # this line is to load the book_versions, without it book_versions will not update!! it's a bug in rails I discovered
  if @book.update_attributes(params[:book]) #<-- returns false finally

Rails bug：accepts_nested_attributes_for没有更新我的has_many关联

1 个答案: