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require "cases/helper"
require 'models/topic'
require 'models/reply'
require 'models/developer'
require 'models/book'
class TransactionTest < ActiveRecord::TestCase
self.use_transactional_fixtures = false
fixtures :topics, :developers
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
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_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 => e
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.new_record?
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.new_record?, "The topic should have its old new_record 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_raises ArgumentError do
Topic.transaction :forced => 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 :force => true do
@first.happy = false
@first.save!
raise
end
rescue
end
end
assert @first.reload.approved?
assert !@second.reload.approved?
end
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
def test_many_savepoints
Topic.transaction do
@first.content = "One"
@first.save!
begin
Topic.transaction :force => true do
@first.content = "Two"
@first.save!
begin
Topic.transaction :force => true do
@first.content = "Three"
@first.save!
begin
Topic.transaction :force => 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
uses_mocha 'mocking connection.commit_db_transaction' do
def test_rollback_when_commit_raises
Topic.connection.expects(:begin_db_transaction)
Topic.connection.expects(:transaction_active?).returns(true) if current_adapter?(:PostgreSQLAdapter)
Topic.connection.expects(:commit_db_transaction).raises('OH NOES')
Topic.connection.expects(:rollback_db_transaction)
assert_raise RuntimeError do
Topic.transaction do
# do nothing
end
end
end
end
def test_sqlite_add_column_in_transaction_raises_statement_invalid
return true unless current_adapter?(:SQLite3Adapter, :SQLiteAdapter)
# 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
# Test now inside a transaction: add_column should raise a StatementInvalid
Topic.transaction do
assert_raises(ActiveRecord::StatementInvalid) { Topic.connection.add_column('topics', 'stuff', :string) }
raise ActiveRecord::Rollback
end
end
private
def add_exception_raising_after_save_callback_to_topic
Topic.class_eval { def after_save() raise "Make the transaction rollback" end }
end
def remove_exception_raising_after_save_callback_to_topic
Topic.class_eval { remove_method :after_save }
end
def add_exception_raising_after_create_callback_to_topic
Topic.class_eval { def after_create() raise "Make the transaction rollback" end }
end
def remove_exception_raising_after_create_callback_to_topic
Topic.class_eval { remove_method :after_create }
end
%w(validation save destroy).each do |filter|
define_method("add_cancelling_before_#{filter}_with_db_side_effect_to_topic") do
Topic.class_eval "def before_#{filter}() Book.create; false end"
end
define_method("remove_cancelling_before_#{filter}_with_db_side_effect_to_topic") do
Topic.class_eval "remove_method :before_#{filter}"
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 current_adapter?(:PostgreSQLAdapter)
class ConcurrentTransactionTest < TransactionTest
use_concurrent_connections
# 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
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
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
end
threads.each { |t| t.join }
end
assert_equal original_salary, Developer.find(1).salary
end
end
end
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