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title: Migrations layout: docs_page date: 2014-08-14 09:34:30

Spot comes with a method for running migrations on Entities that will automatically CREATE and ALTER tables based on the current Entity's fields definition.

Running Migrations

To run migrations for an entity, you just need the corresponding mapper for that entity:

$mapper = $spot->mapper('Entity\Post');

Your database should now have the posts table in it, with all the fields you described in your Post entity.

Please note that **re-naming columns is not supported** in migrations because there is no way for spot to know which column you renamed to what - Spot will see a new column that needs to be created, and a column that no longer exists and needs to be dropped. This could result in data loss during an auto-migration.