Ruby-on-rails 删除 rails 中的模型（与“rails g 模型标题...”相反）
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Removing a model in rails (reverse of "rails g model Title...")
提问by Colbern
rails g model Rating user_id:integer message:string value:integer
How can I completely remove this model? Thanks
我怎样才能完全删除这个模型？谢谢
回答by Mikhail Nikalyukin
bundle exec rake db:rollback
rails destroy model <model_name>
When you generate a model, it creates a database migration. If you run 'destroy' on that model, it will delete the migration file, but not the database table. So before run
生成模型时，它会创建数据库迁移。如果在该模型上运行 'destroy'，它将删除迁移文件，但不会删除数据库表。所以在运行之前
bundle exec rake db:rollback
回答by fl00r
Try this
尝试这个
rails destroy model Rating
It will remove model, migration, tests and fixtures
它将删除模型、迁移、测试和夹具
回答by Jenny Lang
For future questioners: If you can't drop the tables from the console, try to create a migration that drops the tables for you. You should create a migration and then in the file note tables you want dropped like this:
对于未来的提问者：如果您无法从控制台删除表，请尝试创建一个为您删除表的迁移。您应该创建一个迁移，然后在您想要删除的文件注释表中，如下所示：
class DropTables < ActiveRecord::Migration
def up
drop_table :table_you_dont_want
end
def down
raise ActiveRecord::IrreversibleMigration
end
end
回答by Govind shaw
To remove migration (if you already migrated the migration)
rake db:migrate:down VERSION="20130417185845" #Your migration versionTo remove Model
rails d model name #name => Your model name
删除迁移（如果您已经迁移了迁移）
rake db:migrate:down VERSION="20130417185845" #Your migration version删除模型
rails d model name #name => Your model name
回答by Powers
Here's a different implementation of Jenny Lang's answer that works for Rails 5.
这是适用于 Rails 5 的 Jenny Lang 答案的不同实现。
First create the migration file:
首先创建迁移文件：
bundle exec be rails g migration DropEpisodes
Then populate the migration file as follows:
然后按如下方式填充迁移文件：
class DropEpisodes < ActiveRecord::Migration[5.1]
def change
drop_table :episodes
end
end
Running rails db:migratewill drop the table. If you run rails db:rollback, Rails will throw a ActiveRecord::IrreversibleMigrationerror.
运行rails db:migrate将删除表。如果你运行rails db:rollback，Rails 会抛出一个ActiveRecord::IrreversibleMigration错误。
