Rails - 與遷移混淆

我希望有人可以幫助我解決這個問題，而無需重新創建我的整個後端。Rails - 與遷移混淆

我正在使用Rails，並且在部署到Heroku時遇到了問題。當我跑

$ heroku run rake db:migrate

我的遷移失敗，因爲我有一個遷移，刪除了一個不存在的表。發生了什麼是我有一張名爲關係的表，並將其更名爲SchoolCityType（單數）。

這種遷移該刪除的表被丟棄SchoolCityType 小號（複數，因爲它應該是）。

問題：我刪除了遷移文件而不是回滾，但Heroku仍然不會運行該命令。

我該怎麼辦？提前致謝。

的Heroku遷移錯誤消息：

== 20160407014126 DropSchoolDistrictCityTypesTable: migrating ================= 
-- drop_table(:school_district_city_types) 
    (1.7ms) DROP TABLE "school_district_city_types" 
PG::UndefinedTable: ERROR: table "school_district_city_types" does not exist 
: DROP TABLE "school_district_city_types" 
    (1.1ms) ROLLBACK 
rake aborted! 
StandardError: An error has occurred, this and all later migrations canceled:`== 20160407014126 DropSchoolDistrictCityTypesTable: migrating ================= 
-- drop_table(:school_district_city_types) 
    (1.7ms) DROP TABLE "school_district_city_types" 
PG::UndefinedTable: ERROR: table "school_district_city_types" does not exist 
: DROP TABLE "school_district_city_types" 
    (1.1ms) ROLLBACK 
rake aborted! 
StandardError: An error has occurred, this and all later migrations canceled: 

PG::UndefinedTable: ERROR: table "school_district_city_types" does not exist 
: DROP TABLE "school_district_city_types" 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `async_exec' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `block in execute' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log' 
/app/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.2/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:154:in `execute' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/schema_statements.rb:116:in `drop_table' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:662:in `block in method_missing' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:632:in `block in say_with_time' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:632:in `say_with_time' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:652:in `method_missing' 
/app/db/migrate/20160407014126_drop_school_district_city_types_table.rb:3:in `change' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:606:in `exec_migration' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:590:in `block (2 levels) in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:589:in `block in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:588:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:765:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:1041:in `block in ddl_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/transaction.rb:188:in `within_new_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/transactions.rb:220:in `transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:1041:in `ddl_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:994:in `execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:956:in `block in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:952:in `each' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:952:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:820:in `up' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:798:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/tasks/database_tasks.rb:137:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>' 
ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR: table "school_district_city_types" does not exist 
: DROP TABLE "school_district_city_types" 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `async_exec' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `block in execute' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log' 
/app/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.2/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:154:in `execute' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/schema_statements.rb:116:in `drop_table' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:662:in `block in method_missing' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:632:in `block in say_with_time' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:632:in `say_with_time' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:652:in `method_missing' 
/app/db/migrate/20160407014126_drop_school_district_city_types_table.rb:3:in `change' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:606:in `exec_migration' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:590:in `block (2 levels) in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:589:in `block in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:588:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:765:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:1041:in `block in ddl_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/transaction.rb:188:in `within_new_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/transactions.rb:220:in `transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:1041:in `ddl_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:994:in `execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:956:in `block in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:952:in `each' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:952:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:820:in `up' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:798:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/tasks/database_tasks.rb:137:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>' 
PG::UndefinedTable: ERROR: table "school_district_city_types" does not exist 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `async_exec' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `block in execute' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log' 
/app/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.2/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/database_statements.rb:154:in `execute' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql/schema_statements.rb:116:in `drop_table' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:662:in `block in method_missing' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:632:in `block in say_with_time' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:632:in `say_with_time' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:652:in `method_missing' 
/app/db/migrate/20160407014126_drop_school_district_city_types_table.rb:3:in `change' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:606:in `exec_migration' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:590:in `block (2 levels) in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:589:in `block in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:588:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:765:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:1041:in `block in ddl_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/transaction.rb:188:in `within_new_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/transactions.rb:220:in `transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:1041:in `ddl_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:994:in `execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:956:in `block in migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:952:in `each' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:952:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:820:in `up' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/migration.rb:798:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/tasks/database_tasks.rb:137:in `migrate' 
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-4.2.2/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>' 
Tasks: TOP => db:migrate`

來源

2016-05-04 Guilherme Nazareth de Souza

這是不是很清楚你在問什麼。如果您刪除了遷移文件，則應該沒有問題。請包含Heroku日誌中的錯誤消息。 – meagar

我剛剛添加了它。謝謝 –

根據日誌，「20160407014126_drop_school_district_city_types_table」仍然存在，正試圖放下你的桌子。如果該表不再存在於任何數據庫中，則可以簡單地刪除該文件。如果您想維護遷移，因爲您的應用程序的某些實例可能擁有該數據庫，那麼您可以在Heroku上簡單地創建一個名稱正確的空表，以便遷移可以成功完成。 – meagar

如果您刪除遷移仍然可以回滾均勻。

我建議你回滾到一個你感到滿意的位置，並從那裏開始新的遷移。

希望它幫助

來源

2016-05-04 14:05:52 Boltz0r

它看起來像您已刪除它創建「school_district_city_types」遷移文件。您現在正試圖刪除之前不存在/創建的表。只需刪除刪除該表的遷移文件「20160407014126」即可。

來源

2016-05-04 14:37:09

您應該只能刪除遷移文件。在將來寫下你的遷移是這樣的：

drop_table :school_district_city_types if (table_exists? :school_district_city_types)

你將永遠不會再遇到這個問題。

來源

2016-05-04 15:23:33

Rails - 與遷移混淆

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