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当我尝试生成php app/console propel:migration:generate-diff --connection=control
迁移类,但我得到的错误:删除推进移民
[Propel] Error
Uncommitted migrations have been found. You should either execute or delete them before rerunning the propel:migration:generate-diff command.
我已经生成的迁移类我想删除前一个。什么是删除它的命令?