Rails: Pengecualian kendala non null saat membuat model dengan memiliki banyak melalui asosiasi

Langkah-langkah untuk mereproduksi

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"
  gem "rails", github: "rails/rails"
  gem "sqlite3"
end

require "active_record"
require "minitest/autorun"
require "logger"

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true
  create_table :comments, force: true
  create_table :post_comments do |t|
    t.integer :post_id, null: false
    t.integer :comment_id, null: false
  end
end

class Post < ActiveRecord::Base
  has_many :comments, through: :post_comments
  has_many :post_comments
end

class Comment < ActiveRecord::Base
  has_many :posts, through: :post_comments
  has_many :post_comments
end

class PostComment < ActiveRecord::Base
  belongs_to :post
  belongs_to :comment
end

class BugTest < Minitest::Test
  def test_association_stuff
    assert_instance_of Post, Post.create(comments: [Comment.create])
  end
end

Perilaku yang diharapkan

Bahwa sisipan post_comments memiliki post_id dan tidak melanggar batasan bukan nol. Ada beberapa masalah terkait 17015 dan 16494 tetapi ini gagal tanpa menggunakan accepts_nested_attributes_for yang tampaknya terkait dengan dua masalah lainnya, jika ini adalah bug, saya akan dengan senang hati menyelidiki, membantu, dan/atau memiliki mencoba mengirimkan PR.

Perilaku sebenarnya

Transaksi dimulai, komentar dimasukkan, transaksi dilakukan. Transaksi dimulai, posting dimasukkan, komentar posting dimasukkan tetapi tanpa post_id .

BugTest#test_association_stuff:
ActiveRecord::StatementInvalid: SQLite3::ConstraintException: NOT NULL constraint failed: post_comments.post_id: INSERT INTO "post_comments" ("comment_id") VALUES (?)

D, [2016-10-19T22:44:28.638640 #19520] DEBUG -- :    (0.0ms)  begin transaction
D, [2016-10-19T22:44:28.639217 #19520] DEBUG -- :   SQL (0.0ms)  INSERT INTO "comments" DEFAULT VALUES
D, [2016-10-19T22:44:28.639376 #19520] DEBUG -- :    (0.0ms)  commit transaction
D, [2016-10-19T22:44:28.662915 #19520] DEBUG -- :    (0.0ms)  begin transaction
D, [2016-10-19T22:44:28.663491 #19520] DEBUG -- :   SQL (0.0ms)  INSERT INTO "posts" DEFAULT VALUES
D, [2016-10-19T22:44:28.665346 #19520] DEBUG -- :   SQL (0.2ms)  INSERT INTO "post_comments" ("comment_id") VALUES (?)  [["comment_id", 1]]
D, [2016-10-19T22:44:28.665540 #19520] DEBUG -- :    (0.0ms)  rollback transaction

Sistem konfigurasi

Versi rel : 5.0.0.1 & 4.2.7.1

Versi Ruby : 2.3.1p112 (revisi 26-04-2016 54768) [x86_64-darwin15]