我试着跑:
rake db:migrate VERSION=0
它会恢复除最后一个之外的所有迁移。
然后我试着跑:
rake db:migrate:down VERSION=<timestamp_of_last_migration>
但它也没有恢复。为什么?
有没有一个命令可以一次运行所有的down
方法?
发布于 2010-12-09 13:55:59
如果您的数据库只与此项目相关,并且您正在尝试撤消迁移中的所有操作,那么我只需删除该数据库,然后运行rake :create。
然后你就有了一个空的数据库了。
或者,您尝试运行向下脚本还有其他原因吗?
发布于 2010-12-10 01:27:27
你可以看看这张清单。
也许这能帮到你
rake db:create[:all]: If :all not specified then create the database defined in config/database.yml for the current RAILS_ENV. If :all is specified then create all of the databases defined in config/database.yml.
rake db:fixtures:load: Load fixtures into the current environment's database. Load specific fixtures using FIXTURES=x,y
rake db:migrate [VERSION=n]: Migrate the database through scripts in db/migrate. Target specific version with VERSION=n
rake db:migrate:redo [STEP=n]: (2.0.2) Revert the database by rolling back "STEP" number of VERSIONS and re-applying migrations.
rake db:migrate:reset: (2.0.2) Drop the database, create it and then re-apply all migrations. The considerations outlined in the note to rake db:create apply.
rake db:reset: Drop and re-create database using db/schema.rb. The considerations outlined in the note to rake db:create apply.
rake db:rollback [STEP=N]: (2.0.2) Revert migration 1 or n STEPs back.
rake db:schema:dump: Create a db/schema.rb file that can be portably used against any DB supported by AR
rake db:schema:load: Load a schema.rb file into the database
rake db:sessions:clear: Clear the sessions table
rake db:sessions:create: Creates a sessions table for use with CGI::Session::ActiveRecordStore
rake db:structure:dump: Dump the database structure to a SQL file
rake db:test:clone: Recreate the test database from the current environment's database schema
rake db:test:clone_structure: Recreate the test databases from the development structure
rake db:test:prepare: Prepare the test database and load the schema
rake db:test:purge: Empty the test database
发布于 2013-09-26 19:16:59
还有另一种方法:
rake db:rollback STEP=100
这将恢复最近100次迁移
摘自http://guides.rubyonrails.org/migrations.html#rolling-back
https://stackoverflow.com/questions/4395238
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