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Merge branch 'add-to-docs-info-about-moving-migrations' into 'master'

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Add information about moving migrations

See merge request gitlab-org/gitlab-ce!27159
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Marcia Ramos 2019-04-12 16:42:00 +00:00
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doc/development/migration_style_guide.md
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@ -423,3 +423,9 @@ _namespaces_ that have a `project_id`.
The `path` column for these rows will be renamed to their previous value followed
by an integer. For example: `users` would turn into `users0`
### Moving migrations from EE to CE
When migrations need to be moved from GitLab Enterprise Edition to GitLab Community Edition,
a migration file should be moved from `ee/db/{post_,}migrate` directory in the `gitlab-ee` project to `db/{post_,}migrate` directory in the `gitlab-ce` project. This way
the schema number remains intact, there is no need to modify old migrations, and proper columns, tables or data are added in the Community Edition.