Doctrine migrations:diff generate new migrations every time?

Question

Doctrine ORM

doctrine:migrations:diff                Generate a migration by comparing your current database to your mapping information.

In theory, it should check the current database and the mapping that is specified in the annotations in my Entity. However, for some reason it generates new migrations to Entity every time. That is, if I have 1 Entity, I already have a migration, nothing has changed in the mapping, then after entering doctrine:migrations:diffthere will be another same new migration. And then, of course, the script doctrine:migrations:migratethrows errors that such fields already exist. For in the first migration there was an insertion of fields, and in the second there is an insertion.

doctrine_migrations:
    dir_name: '%kernel.project_dir%/src/Migrations'
    # namespace is arbitrary but should be different from App\Migrations
    # as migrations classes should NOT be autoloaded
    namespace: App\Migrations

So it will throw an error that there is no such namespace, because it really does not exist.

namespace: DoctrineMigrations\Infrastructure\Migrations

Why does it generate a new migration each time?

Answer 1

Because the first generated migration was not applied. The generator does compare schema and mapping, but it doesn't look at generated but not applied migrations. That is, there must be a doctrine:migrations:migrate between each doctrine:migrations:diff. Or you need to delete unused ones before generation.