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diff --git a/doc/development/foreign_keys.md b/doc/development/foreign_keys.md index a9edbc68a2e..db8367fe5f5 100644 --- a/doc/development/foreign_keys.md +++ b/doc/development/foreign_keys.md @@ -80,6 +80,12 @@ foreign keys to remove the data as this would result in the file system data being left behind. In such a case you should use a service class instead that takes care of removing non database data. +In cases where the relation spans multiple databases you will have even +further problems using `dependent: :destroy` or the above hooks. You can +read more about alternatives at [Avoid `dependent: :nullify` and +`dependent: :destroy` across +databases](database/multiple_databases.md#avoid-dependent-nullify-and-dependent-destroy-across-databases). + ## Alternative primary keys with has_one associations Sometimes a `has_one` association is used to create a one-to-one relationship: |