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Diffstat (limited to 'guides/source/association_basics.md')
| -rw-r--r-- | guides/source/association_basics.md | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/guides/source/association_basics.md b/guides/source/association_basics.md index 78a1f47407..38e46e4bf8 100644 --- a/guides/source/association_basics.md +++ b/guides/source/association_basics.md @@ -1257,8 +1257,8 @@ Controls what happens to the associated object when its owner is destroyed: * `:destroy` causes the associated object to also be destroyed * `:delete` causes the associated object to be deleted directly from the database (so callbacks will not execute) -* `:nullify` causes the foreign key to be set to `NULL`. Callbacks are not executed. -* `:restrict_with_exception` causes an exception to be raised if there is an associated record +* `:nullify` causes the foreign key to be set to `NULL`. Polymorphic type column is also nullified on polymorphic associations. Callbacks are not executed. +* `:restrict_with_exception` causes an `ActiveRecord::DeleteRestrictionError` exception to be raised if there is an associated record * `:restrict_with_error` causes an error to be added to the owner if there is an associated object It's necessary not to set or leave `:nullify` option for those associations @@ -1658,10 +1658,12 @@ Controls what happens to the associated objects when their owner is destroyed: * `:destroy` causes all the associated objects to also be destroyed * `:delete_all` causes all the associated objects to be deleted directly from the database (so callbacks will not execute) -* `:nullify` causes the foreign keys to be set to `NULL`. Callbacks are not executed. -* `:restrict_with_exception` causes an exception to be raised if there are any associated records +* `:nullify` causes the foreign key to be set to `NULL`. Polymorphic type column is also nullified on polymorphic associations. Callbacks are not executed. +* `:restrict_with_exception` causes an `ActiveRecord::DeleteRestrictionError` exception to be raised if there are any associated records * `:restrict_with_error` causes an error to be added to the owner if there are any associated objects +The `:destroy` and `:delete_all` options also affect the semantics of the `collection.delete` and `collection=` methods by causing them to destroy associated objects when they are removed from the collection. + ##### `:foreign_key` By convention, Rails assumes that the column used to hold the foreign key on the other model is the name of this model with the suffix `_id` added. The `:foreign_key` option lets you set the name of the foreign key directly: |