Skip to content
This repository
tree: 1447aca70f
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 635 lines (550 sloc) 18.235 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634
require "cases/helper"
require 'models/topic'
require 'models/reply'
require 'models/developer'
require 'models/book'
require 'models/author'
require 'models/post'

class TransactionTest < ActiveRecord::TestCase
  self.use_transactional_fixtures = false
  fixtures :topics, :developers, :authors, :posts

  def setup
    @first, @second = Topic.find(1, 2).sort_by { |t| t.id }
  end

  def test_successful
    Topic.transaction do
      @first.approved = true
      @second.approved = false
      @first.save
      @second.save
    end

    assert Topic.find(1).approved?, "First should have been approved"
    assert !Topic.find(2).approved?, "Second should have been unapproved"
  end

  def transaction_with_return
    Topic.transaction do
      @first.approved = true
      @second.approved = false
      @first.save
      @second.save
      return
    end
  end

  def test_successful_with_return
    class << Topic.connection
      alias :real_commit_db_transaction :commit_db_transaction
      def commit_db_transaction
        $committed = true
        real_commit_db_transaction
      end
    end

    $committed = false
    transaction_with_return
    assert $committed

    assert Topic.find(1).approved?, "First should have been approved"
    assert !Topic.find(2).approved?, "Second should have been unapproved"
  ensure
    class << Topic.connection
      remove_method :commit_db_transaction
      alias :commit_db_transaction :real_commit_db_transaction rescue nil
    end
  end

  def test_successful_with_instance_method
    @first.transaction do
      @first.approved = true
      @second.approved = false
      @first.save
      @second.save
    end

    assert Topic.find(1).approved?, "First should have been approved"
    assert !Topic.find(2).approved?, "Second should have been unapproved"
  end

  def test_failing_on_exception
    begin
      Topic.transaction do
        @first.approved = true
        @second.approved = false
        @first.save
        @second.save
        raise "Bad things!"
      end
    rescue
      # caught it
    end

    assert @first.approved?, "First should still be changed in the objects"
    assert !@second.approved?, "Second should still be changed in the objects"

    assert !Topic.find(1).approved?, "First shouldn't have been approved"
    assert Topic.find(2).approved?, "Second should still be approved"
  end

  def test_raising_exception_in_callback_rollbacks_in_save
    add_exception_raising_after_save_callback_to_topic

    begin
      @first.approved = true
      @first.save
      flunk
    rescue => e
      assert_equal "Make the transaction rollback", e.message
      assert !Topic.find(1).approved?
    ensure
      remove_exception_raising_after_save_callback_to_topic
    end
  end

  def test_update_attributes_should_rollback_on_failure
    author = Author.find(1)
    posts_count = author.posts.size
    assert posts_count > 0
    status = author.update_attributes(:name => nil, :post_ids => [])
    assert !status
    assert_equal posts_count, author.posts(true).size
  end

  def test_update_attributes_should_rollback_on_failure!
    author = Author.find(1)
    posts_count = author.posts.size
    assert posts_count > 0
    assert_raise(ActiveRecord::RecordInvalid) do
      author.update_attributes!(:name => nil, :post_ids => [])
    end
    assert_equal posts_count, author.posts(true).size
  end

  def test_cancellation_from_before_destroy_rollbacks_in_destroy
    add_cancelling_before_destroy_with_db_side_effect_to_topic
    begin
      nbooks_before_destroy = Book.count
      status = @first.destroy
      assert !status
      assert_nothing_raised(ActiveRecord::RecordNotFound) { @first.reload }
      assert_equal nbooks_before_destroy, Book.count
    ensure
      remove_cancelling_before_destroy_with_db_side_effect_to_topic
    end
  end

  def test_cancellation_from_before_filters_rollbacks_in_save
    %w(validation save).each do |filter|
      send("add_cancelling_before_#{filter}_with_db_side_effect_to_topic")
      begin
        nbooks_before_save = Book.count
        original_author_name = @first.author_name
        @first.author_name += '_this_should_not_end_up_in_the_db'
        status = @first.save
        assert !status
        assert_equal original_author_name, @first.reload.author_name
        assert_equal nbooks_before_save, Book.count
      ensure
        send("remove_cancelling_before_#{filter}_with_db_side_effect_to_topic")
      end
    end
  end

  def test_cancellation_from_before_filters_rollbacks_in_save!
    %w(validation save).each do |filter|
      send("add_cancelling_before_#{filter}_with_db_side_effect_to_topic")
      begin
        nbooks_before_save = Book.count
        original_author_name = @first.author_name
        @first.author_name += '_this_should_not_end_up_in_the_db'
        @first.save!
        flunk
      rescue
        assert_equal original_author_name, @first.reload.author_name
        assert_equal nbooks_before_save, Book.count
      ensure
        send("remove_cancelling_before_#{filter}_with_db_side_effect_to_topic")
      end
    end
  end

  def test_callback_rollback_in_create
    new_topic = Topic.new(
      :title => "A new topic",
      :author_name => "Ben",
      :author_email_address => "ben@example.com",
      :written_on => "2003-07-16t15:28:11.2233+01:00",
      :last_read => "2004-04-15",
      :bonus_time => "2005-01-30t15:28:00.00+01:00",
      :content => "Have a nice day",
      :approved => false)
    new_record_snapshot = !new_topic.persisted?
    id_present = new_topic.has_attribute?(Topic.primary_key)
    id_snapshot = new_topic.id

    # Make sure the second save gets the after_create callback called.
    2.times do
      begin
        add_exception_raising_after_create_callback_to_topic
        new_topic.approved = true
        new_topic.save
        flunk
      rescue => e
        assert_equal "Make the transaction rollback", e.message
        assert_equal new_record_snapshot, !new_topic.persisted?, "The topic should have its old persisted value"
        assert_equal id_snapshot, new_topic.id, "The topic should have its old id"
        assert_equal id_present, new_topic.has_attribute?(Topic.primary_key)
      ensure
        remove_exception_raising_after_create_callback_to_topic
      end
    end
  end

  def test_nested_explicit_transactions
    Topic.transaction do
      Topic.transaction do
        @first.approved = true
        @second.approved = false
        @first.save
        @second.save
      end
    end

    assert Topic.find(1).approved?, "First should have been approved"
    assert !Topic.find(2).approved?, "Second should have been unapproved"
  end

  def test_manually_rolling_back_a_transaction
    Topic.transaction do
      @first.approved = true
      @second.approved = false
      @first.save
      @second.save

      raise ActiveRecord::Rollback
    end

    assert @first.approved?, "First should still be changed in the objects"
    assert !@second.approved?, "Second should still be changed in the objects"

    assert !Topic.find(1).approved?, "First shouldn't have been approved"
    assert Topic.find(2).approved?, "Second should still be approved"
  end

  def test_invalid_keys_for_transaction
    assert_raise ArgumentError do
      Topic.transaction :nested => true do
      end
    end
  end

  def test_force_savepoint_in_nested_transaction
    Topic.transaction do
      @first.approved = true
      @second.approved = false
      @first.save!
      @second.save!

      begin
        Topic.transaction :requires_new => true do
          @first.happy = false
          @first.save!
          raise
        end
      rescue
      end
    end

    assert @first.reload.approved?
    assert !@second.reload.approved?
  end if Topic.connection.supports_savepoints?

  def test_force_savepoint_on_instance
    @first.transaction do
      @first.approved = true
      @second.approved = false
      @first.save!
      @second.save!

      begin
        @second.transaction :requires_new => true do
          @first.happy = false
          @first.save!
          raise
        end
      rescue
      end
    end

    assert @first.reload.approved?
    assert !@second.reload.approved?
  end if Topic.connection.supports_savepoints?

  def test_no_savepoint_in_nested_transaction_without_force
    Topic.transaction do
      @first.approved = true
      @second.approved = false
      @first.save!
      @second.save!

      begin
        Topic.transaction do
          @first.approved = false
          @first.save!
          raise
        end
      rescue
      end
    end

    assert !@first.reload.approved?
    assert !@second.reload.approved?
  end if Topic.connection.supports_savepoints?

  def test_many_savepoints
    Topic.transaction do
      @first.content = "One"
      @first.save!

      begin
        Topic.transaction :requires_new => true do
          @first.content = "Two"
          @first.save!

          begin
            Topic.transaction :requires_new => true do
              @first.content = "Three"
              @first.save!

              begin
                Topic.transaction :requires_new => true do
                  @first.content = "Four"
                  @first.save!
                  raise
                end
              rescue
              end

              @three = @first.reload.content
              raise
            end
          rescue
          end

          @two = @first.reload.content
          raise
        end
      rescue
      end

      @one = @first.reload.content
    end

    assert_equal "One", @one
    assert_equal "Two", @two
    assert_equal "Three", @three
  end if Topic.connection.supports_savepoints?

  def test_rollback_when_commit_raises
    Topic.connection.expects(:begin_db_transaction)
    Topic.connection.expects(:commit_db_transaction).raises('OH NOES')
    Topic.connection.expects(:outside_transaction?).returns(false)
    Topic.connection.expects(:rollback_db_transaction)

    assert_raise RuntimeError do
      Topic.transaction do
        # do nothing
      end
    end
  end

  def test_rollback_when_saving_a_frozen_record
    topic = Topic.new(:title => 'test')
    topic.freeze
    e = assert_raise(RuntimeError) { topic.save }
    assert_equal "can't modify frozen Hash", e.message
    assert !topic.persisted?, 'not persisted'
    assert_nil topic.id
    assert topic.frozen?, 'not frozen'
  end

  def test_restore_active_record_state_for_all_records_in_a_transaction
    topic_1 = Topic.new(:title => 'test_1')
    topic_2 = Topic.new(:title => 'test_2')
    Topic.transaction do
      assert topic_1.save
      assert topic_2.save
      @first.save
      @second.destroy
      assert topic_1.persisted?, 'persisted'
      assert_not_nil topic_1.id
      assert topic_2.persisted?, 'persisted'
      assert_not_nil topic_2.id
      assert @first.persisted?, 'persisted'
      assert_not_nil @first.id
      assert @second.destroyed?, 'destroyed'
      raise ActiveRecord::Rollback
    end

    assert !topic_1.persisted?, 'not persisted'
    assert_nil topic_1.id
    assert !topic_2.persisted?, 'not persisted'
    assert_nil topic_2.id
    assert @first.persisted?, 'persisted'
    assert_not_nil @first.id
    assert !@second.destroyed?, 'not destroyed'
  end

  if current_adapter?(:PostgreSQLAdapter) && defined?(PGconn::PQTRANS_IDLE)
    def test_outside_transaction_works
      assert Topic.connection.outside_transaction?
      Topic.connection.begin_db_transaction
      assert !Topic.connection.outside_transaction?
      Topic.connection.rollback_db_transaction
      assert Topic.connection.outside_transaction?
    end

    def test_rollback_wont_be_executed_if_no_transaction_active
      assert_raise RuntimeError do
        Topic.transaction do
          Topic.connection.rollback_db_transaction
          Topic.connection.expects(:rollback_db_transaction).never
          raise "Rails doesn't scale!"
        end
      end
    end

    def test_open_transactions_count_is_reset_to_zero_if_no_transaction_active
      Topic.transaction do
        Topic.transaction do
          Topic.connection.rollback_db_transaction
        end
        assert_equal 0, Topic.connection.open_transactions
      end
      assert_equal 0, Topic.connection.open_transactions
    end
  end

  def test_sqlite_add_column_in_transaction
    return true unless current_adapter?(:SQLite3Adapter)

    # Test first if column creation/deletion works correctly when no
    # transaction is in place.
    #
    # We go back to the connection for the column queries because
    # Topic.columns is cached and won't report changes to the DB

    assert_nothing_raised do
      Topic.reset_column_information
      Topic.connection.add_column('topics', 'stuff', :string)
      assert Topic.column_names.include?('stuff')

      Topic.reset_column_information
      Topic.connection.remove_column('topics', 'stuff')
      assert !Topic.column_names.include?('stuff')
    end

    if Topic.connection.supports_ddl_transactions?
      assert_nothing_raised do
        Topic.transaction { Topic.connection.add_column('topics', 'stuff', :string) }
      end
    else
      Topic.transaction do
        assert_raise(ActiveRecord::StatementInvalid) { Topic.connection.add_column('topics', 'stuff', :string) }
        raise ActiveRecord::Rollback
      end
    end
  end

  private
    def define_callback_method(callback_method)
      define_method(callback_method) do
        self.history << [callback_method, :method]
      end
    end

    def add_exception_raising_after_save_callback_to_topic
      Topic.class_eval <<-eoruby, __FILE__, __LINE__ + 1
remove_method(:after_save_for_transaction)
def after_save_for_transaction
raise 'Make the transaction rollback'
end
eoruby
    end

    def remove_exception_raising_after_save_callback_to_topic
      Topic.class_eval <<-eoruby, __FILE__, __LINE__ + 1
remove_method :after_save_for_transaction
def after_save_for_transaction; end
eoruby
    end

    def add_exception_raising_after_create_callback_to_topic
      Topic.class_eval <<-eoruby, __FILE__, __LINE__ + 1
remove_method(:after_create_for_transaction)
def after_create_for_transaction
raise 'Make the transaction rollback'
end
eoruby
    end

    def remove_exception_raising_after_create_callback_to_topic
      Topic.class_eval <<-eoruby, __FILE__, __LINE__ + 1
remove_method :after_create_for_transaction
def after_create_for_transaction; end
eoruby
    end

    %w(validation save destroy).each do |filter|
      define_method("add_cancelling_before_#{filter}_with_db_side_effect_to_topic") do
        Topic.class_eval <<-eoruby, __FILE__, __LINE__ + 1
remove_method :before_#{filter}_for_transaction
def before_#{filter}_for_transaction
Book.create
false
end
eoruby
      end

      define_method("remove_cancelling_before_#{filter}_with_db_side_effect_to_topic") do
        Topic.class_eval <<-eoruby, __FILE__, __LINE__ + 1
remove_method :before_#{filter}_for_transaction
def before_#{filter}_for_transaction; end
eoruby
      end
    end
end

class TransactionsWithTransactionalFixturesTest < ActiveRecord::TestCase
  self.use_transactional_fixtures = true
  fixtures :topics

  def test_automatic_savepoint_in_outer_transaction
    @first = Topic.find(1)

    begin
      Topic.transaction do
        @first.approved = true
        @first.save!
        raise
      end
    rescue
      assert !@first.reload.approved?
    end
  end

  def test_no_automatic_savepoint_for_inner_transaction
    @first = Topic.find(1)

    Topic.transaction do
      @first.approved = true
      @first.save!

      begin
        Topic.transaction do
          @first.approved = false
          @first.save!
          raise
        end
      rescue
      end
    end

    assert !@first.reload.approved?
  end
end if Topic.connection.supports_savepoints?

if current_adapter?(:PostgreSQLAdapter)
  class ConcurrentTransactionTest < TransactionTest
    # This will cause transactions to overlap and fail unless they are performed on
    # separate database connections.
    def test_transaction_per_thread
      assert_nothing_raised do
        threads = (1..3).map do
          Thread.new do
            Topic.transaction do
              topic = Topic.find(1)
              topic.approved = !topic.approved?
              topic.save!
              topic.approved = !topic.approved?
              topic.save!
            end
            Topic.connection.close
          end
        end

        threads.each { |t| t.join }
      end
    end

    # Test for dirty reads among simultaneous transactions.
    def test_transaction_isolation__read_committed
      # Should be invariant.
      original_salary = Developer.find(1).salary
      temporary_salary = 200000

      assert_nothing_raised do
        threads = (1..3).map do
          Thread.new do
            Developer.transaction do
              # Expect original salary.
              dev = Developer.find(1)
              assert_equal original_salary, dev.salary

              dev.salary = temporary_salary
              dev.save!

              # Expect temporary salary.
              dev = Developer.find(1)
              assert_equal temporary_salary, dev.salary

              dev.salary = original_salary
              dev.save!

              # Expect original salary.
              dev = Developer.find(1)
              assert_equal original_salary, dev.salary
            end
            Developer.connection.close
          end
        end

        # Keep our eyes peeled.
        threads << Thread.new do
          10.times do
            sleep 0.05
            Developer.transaction do
              # Always expect original salary.
              assert_equal original_salary, Developer.find(1).salary
            end
          end
          Developer.connection.close
        end

        threads.each { |t| t.join }
      end

      assert_equal original_salary, Developer.find(1).salary
    end
  end
end
Something went wrong with that request. Please try again.