Active Recordの話です。
create_or_find_byの実装はcreateしてみてユニーク制約に引っかかったらfind_byしてみるなので、ふつうに考えるとfind_byは成功しそうに見えます。
def create_or_find_by(attributes, &block) transaction(requires_new: true) { create(attributes, &block) } rescue ActiveRecord::RecordNotUnique find_by!(attributes) end
ですが、以下のスクリプトを実行するとcreate_or_find_byはcreateがRecordNotUnique例外を吐いたあと、find_byもRecordNotFound例外を吐いてレコードを見つけられずに死にます。
ちょっと今から会食なので原理は帰ってから書き足しますしばしお待ちを🙇♂️
これ時間あったら続き書きたいけどとりいそぎ説明すると、REPEATABLE READでファントムリードを防いでることを利用して失敗させてるからREAD COMMITTEDにしてファントムリードを許すかSERIALIZABLEにするかLocking Readして別トランザクションの更新をブロックすると失敗を防げます。 https://t.co/v4LBhwDWeR
— Ryuta Kamizono (@kamipo) December 20, 2020
# frozen_string_literal: true require "bundler/inline" gemfile(true) do source "https://rubygems.org" git_source(:github) { |repo| "https://github.com/#{repo}.git" } gem "activerecord", "6.1.0" gem "mysql2" end require "active_record" require "logger" ActiveRecord::Base.establish_connection(adapter: "mysql2", database: "test", username: "root") ActiveRecord::Base.logger = Logger.new(STDOUT) ActiveRecord::Schema.define do create_table :users, force: true do |t| t.string :name, index: { unique: true } end end class User < ActiveRecord::Base end t = Thread.new do sleep 0.1 User.create!(name: "foo") end User.transaction do User.find_by!(name: "foo") rescue ActiveRecord::RecordNotFound puts 'User<name: "foo"> not found' sleep 0.2 User.create_or_find_by!(name: "foo").tap do puts 'User<name: "foo"> has found or created' end end t.join
% ruby foo.rb
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Using concurrent-ruby 1.1.7
Using i18n 1.8.5
Using minitest 5.14.2
Using tzinfo 2.0.3
Using zeitwerk 2.4.2
Using activesupport 6.1.0
Using activemodel 6.1.0
Using activerecord 6.1.0
Using bundler 2.1.4
Using mysql2 0.5.3
-- create_table(:users, {:force=>true})
D, [2020-12-16T18:55:22.915787 #49715] DEBUG -- : (12.2ms) DROP TABLE IF EXISTS `users`
D, [2020-12-16T18:55:22.954341 #49715] DEBUG -- : (37.5ms) CREATE TABLE `users` (`id` bigint NOT NULL AUTO_INCREMENT PRIMARY KEY, `name` varchar(255), UNIQUE INDEX `index_users_on_name` (`name`))
-> 0.0754s
D, [2020-12-16T18:55:23.132151 #49715] DEBUG -- : ActiveRecord::InternalMetadata Load (0.7ms) SELECT `ar_internal_metadata`.* FROM `ar_internal_metadata` WHERE `ar_internal_metadata`.`key` = 'environment' LIMIT 1
D, [2020-12-16T18:55:23.147310 #49715] DEBUG -- : TRANSACTION (0.3ms) BEGIN
D, [2020-12-16T18:55:23.151778 #49715] DEBUG -- : User Load (0.8ms) SELECT `users`.* FROM `users` WHERE `users`.`name` = 'foo' LIMIT 1
User<name: "foo"> not found
D, [2020-12-16T18:55:23.283424 #49715] DEBUG -- : TRANSACTION (0.3ms) BEGIN
D, [2020-12-16T18:55:23.287159 #49715] DEBUG -- : User Create (3.5ms) INSERT INTO `users` (`name`) VALUES ('foo')
D, [2020-12-16T18:55:23.290553 #49715] DEBUG -- : TRANSACTION (2.8ms) COMMIT
D, [2020-12-16T18:55:23.359126 #49715] DEBUG -- : TRANSACTION (0.3ms) SAVEPOINT active_record_1
D, [2020-12-16T18:55:23.360585 #49715] DEBUG -- : User Create (1.2ms) INSERT INTO `users` (`name`) VALUES ('foo')
D, [2020-12-16T18:55:23.361383 #49715] DEBUG -- : TRANSACTION (0.3ms) ROLLBACK TO SAVEPOINT active_record_1
D, [2020-12-16T18:55:23.362859 #49715] DEBUG -- : User Load (0.5ms) SELECT `users`.* FROM `users` WHERE `users`.`name` = 'foo' LIMIT 1
D, [2020-12-16T18:55:23.363994 #49715] DEBUG -- : TRANSACTION (0.5ms) ROLLBACK
Traceback (most recent call last):
12: from foo.rb:34:in `<main>'
11: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:209:in `transaction'
10: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `transaction'
9: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:308:in `within_new_transaction'
8: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
7: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
6: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
5: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
4: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
3: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:310:in `block in within_new_transaction'
2: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `block in transaction'
1: from foo.rb:35:in `block in <main>'
/Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/core.rb:366:in `find_by!': Couldn't find User (ActiveRecord::RecordNotFound)
87: from foo.rb:34:in `<main>'
86: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:209:in `transaction'
85: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `transaction'
84: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:308:in `within_new_transaction'
83: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
82: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
81: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
80: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
79: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
78: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:310:in `block in within_new_transaction'
77: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `block in transaction'
76: from foo.rb:35:in `block in <main>'
75: from foo.rb:41:in `rescue in block in <main>'
74: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/querying.rb:22:in `create_or_find_by!'
73: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:218:in `create_or_find_by!'
72: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/delegation.rb:108:in `method_missing'
71: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:406:in `scoping'
70: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:811:in `_scoping'
69: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:406:in `block in scoping'
68: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/delegation.rb:108:in `block in method_missing'
67: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/delegation.rb:108:in `public_send'
66: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:209:in `transaction'
65: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `transaction'
64: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:308:in `within_new_transaction'
63: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
62: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
61: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
60: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
59: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
58: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:310:in `block in within_new_transaction'
57: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `block in transaction'
56: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:218:in `block in create_or_find_by!'
55: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:114:in `create!'
54: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:406:in `scoping'
53: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:811:in `_scoping'
52: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:406:in `block in scoping'
51: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:114:in `block in create!'
50: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:806:in `_create!'
49: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:55:in `create!'
48: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/suppressor.rb:48:in `save!'
47: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:300:in `save!'
46: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:348:in `with_transaction_returning_status'
45: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:318:in `transaction'
44: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:352:in `block in with_transaction_returning_status'
43: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:300:in `block in save!'
42: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/validations.rb:53:in `save!'
41: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:507:in `save!'
40: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/timestamp.rb:126:in `create_or_update'
39: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/callbacks.rb:457:in `create_or_update'
38: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/callbacks.rb:824:in `_run_save_callbacks'
37: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/callbacks.rb:98:in `run_callbacks'
36: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/callbacks.rb:457:in `block in create_or_update'
35: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:900:in `create_or_update'
34: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/timestamp.rb:108:in `_create_record'
33: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/callbacks.rb:461:in `_create_record'
32: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/callbacks.rb:824:in `_run_create_callbacks'
31: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/callbacks.rb:98:in `run_callbacks'
30: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/callbacks.rb:461:in `block in _create_record'
29: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/attribute_methods/dirty.rb:201:in `_create_record'
28: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/locking/optimistic.rb:79:in `_create_record'
27: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/counter_cache.rb:166:in `_create_record'
26: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:929:in `_create_record'
25: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:375:in `_insert_record'
24: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/query_cache.rb:22:in `insert'
23: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:171:in `insert'
22: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `exec_insert'
21: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/mysql/database_statements.rb:55:in `exec_query'
20: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:215:in `execute_and_free'
19: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/mysql/database_statements.rb:50:in `execute'
18: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:204:in `execute'
17: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:688:in `log'
16: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/notifications/instrumenter.rb:24:in `instrument'
15: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:696:in `block in log'
14: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
13: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
12: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
11: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
10: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
9: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:697:in `block (2 levels) in log'
8: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:205:in `block in execute'
7: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/dependencies/interlock.rb:47:in `permit_concurrent_loads'
6: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/share_lock.rb:187:in `yield_shares'
5: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/dependencies/interlock.rb:48:in `block in permit_concurrent_loads'
4: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:206:in `block (2 levels) in execute'
3: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:130:in `query'
2: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:130:in `handle_interrupt'
1: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:131:in `block in query'
/Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:131:in `_query': Duplicate entry 'foo' for key 'users.index_users_on_name' (Mysql2::Error)
87: from foo.rb:34:in `<main>'
86: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:209:in `transaction'
85: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `transaction'
84: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:308:in `within_new_transaction'
83: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
82: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
81: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
80: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
79: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
78: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:310:in `block in within_new_transaction'
77: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `block in transaction'
76: from foo.rb:35:in `block in <main>'
75: from foo.rb:41:in `rescue in block in <main>'
74: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/querying.rb:22:in `create_or_find_by!'
73: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:218:in `create_or_find_by!'
72: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/delegation.rb:108:in `method_missing'
71: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:406:in `scoping'
70: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:811:in `_scoping'
69: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:406:in `block in scoping'
68: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/delegation.rb:108:in `block in method_missing'
67: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/delegation.rb:108:in `public_send'
66: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:209:in `transaction'
65: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `transaction'
64: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:308:in `within_new_transaction'
63: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
62: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
61: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
60: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
59: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
58: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:310:in `block in within_new_transaction'
57: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `block in transaction'
56: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:218:in `block in create_or_find_by!'
55: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:114:in `create!'
54: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:406:in `scoping'
53: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:811:in `_scoping'
52: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:406:in `block in scoping'
51: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:114:in `block in create!'
50: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:806:in `_create!'
49: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:55:in `create!'
48: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/suppressor.rb:48:in `save!'
47: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:300:in `save!'
46: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:348:in `with_transaction_returning_status'
45: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:318:in `transaction'
44: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:352:in `block in with_transaction_returning_status'
43: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:300:in `block in save!'
42: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/validations.rb:53:in `save!'
41: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:507:in `save!'
40: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/timestamp.rb:126:in `create_or_update'
39: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/callbacks.rb:457:in `create_or_update'
38: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/callbacks.rb:824:in `_run_save_callbacks'
37: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/callbacks.rb:98:in `run_callbacks'
36: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/callbacks.rb:457:in `block in create_or_update'
35: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:900:in `create_or_update'
34: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/timestamp.rb:108:in `_create_record'
33: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/callbacks.rb:461:in `_create_record'
32: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/callbacks.rb:824:in `_run_create_callbacks'
31: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/callbacks.rb:98:in `run_callbacks'
30: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/callbacks.rb:461:in `block in _create_record'
29: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/attribute_methods/dirty.rb:201:in `_create_record'
28: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/locking/optimistic.rb:79:in `_create_record'
27: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/counter_cache.rb:166:in `_create_record'
26: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:929:in `_create_record'
25: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/persistence.rb:375:in `_insert_record'
24: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/query_cache.rb:22:in `insert'
23: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:171:in `insert'
22: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `exec_insert'
21: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/mysql/database_statements.rb:55:in `exec_query'
20: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:215:in `execute_and_free'
19: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/mysql/database_statements.rb:50:in `execute'
18: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:204:in `execute'
17: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:688:in `log'
16: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/notifications/instrumenter.rb:24:in `instrument'
15: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:696:in `block in log'
14: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
13: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
12: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
11: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
10: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
9: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:697:in `block (2 levels) in log'
8: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:205:in `block in execute'
7: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/dependencies/interlock.rb:47:in `permit_concurrent_loads'
6: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/share_lock.rb:187:in `yield_shares'
5: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/dependencies/interlock.rb:48:in `block in permit_concurrent_loads'
4: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:206:in `block (2 levels) in execute'
3: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:130:in `query'
2: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:130:in `handle_interrupt'
1: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:131:in `block in query'
/Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:131:in `_query': Mysql2::Error: Duplicate entry 'foo' for key 'users.index_users_on_name' (ActiveRecord::RecordNotUnique)
18: from foo.rb:34:in `<main>'
17: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/transactions.rb:209:in `transaction'
16: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `transaction'
15: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:308:in `within_new_transaction'
14: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
13: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
12: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
11: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
10: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
9: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/transaction.rb:310:in `block in within_new_transaction'
8: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:320:in `block in transaction'
7: from foo.rb:35:in `block in <main>'
6: from foo.rb:41:in `rescue in block in <main>'
5: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/querying.rb:22:in `create_or_find_by!'
4: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:217:in `create_or_find_by!'
3: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation.rb:220:in `rescue in create_or_find_by!'
2: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/finder_methods.rb:87:in `find_by!'
1: from /Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/finder_methods.rb:104:in `take!'
/Users/kamipo/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.0/lib/active_record/relation/finder_methods.rb:354:in `raise_record_not_found_exception!': Couldn't find User with [WHERE `users`.`name` = ?] (ActiveRecord::RecordNotFound)
https://gist.github.com/kamipo/480f9e6fb61bef0f36b1edbccfd30f66
