0
A
回答
6
退房的Ruby on Rails Migration Guide。例如,在迁移中删除表格:
class DropProducts < ActiveRecord::Migration
def self.up
drop_table :products
end
def self.down
raise ActiveRecord::IrreversibleMigration
end
end
1
这可以通过使用与下面的命令迁移来实现: -
def self.up
drop_table :table_name
end
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请格式化所有代码。 – JShoe 2013-07-03 04:44:02