在Rails中销毁/删除数据库

Question

是否可以从现有应用程序中完全删除数据库和所有迁移记录等，以便我可以从头重新设计数据库？

Answer 1

通过发行rake -T您有以下数据库任务：

rake db:create   # Create the database from DATABASE_URL or config/database.yml for the current Rails.env (use db:create:all to create all dbs in the config) 
rake db:drop   # Drops the database using DATABASE_URL or the current Rails.env (use db:drop:all to drop all databases) 
rake db:fixtures:load # Load fixtures into the current environment's database 
rake db:migrate   # Migrate the database (options: VERSION=x, VERBOSE=false) 
rake db:migrate:status # Display status of migrations 
rake db:rollback  # Rolls the schema back to the previous version (specify steps w/ STEP=n) 
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:seed   # Load the seed data from db/seeds.rb 
rake db:setup   # Create the database, load the schema, and initialize with the seed data (use db:reset to also drop the db first) 
rake db:structure:dump # Dump the database structure to db/structure.sql 
rake db:version   # Retrieves the current schema version number 

因此，要发布bundle exec rake db:drop:all，并且如果要删除所有迁移，并且假设你只想删除迁移，删除它们并写入新的迁移。

如果您也想更换模型，请使用rails d model。

Answer 2

这将摆脱分贝：

rake db:drop 

并为每个迁移，你必须：

rails d migration migration_name 

Answer 3

是的，它可能会删除数据库和迁移。

rake db:drop 
rake db:rollback 
rails d migration 'migration name' 
rake db:create 
rake db:migrate 
rake db:seed 
rake db:test:prepare