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Association callbacks work with abort instead of exceptions [ci skip]

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To prevent an object from being added/removed from an association an
abort must be thrown, not an Exception.
This commit is contained in:
Petrik 2020-05-08 16:34:56 +02:00
parent bd87b37d4f
commit 6b05b50440
1 changed files with 9 additions and 1 deletions
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10
guides/source/association_basics.md
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@ -2400,8 +2400,16 @@ class Author < ApplicationRecord
end
```
If a `before_add` callback throws an exception, the object does not get added to the collection. Similarly, if a `before_remove` callback throws an exception, the object does not get removed from the collection.
If a `before_add` callback throws `:abort`, the object does not get added to
the collection. Similarly, if a `before_remove` callback throws `:abort`, the
object does not get removed from the collection:
```ruby
# book won't be added if the limit has been reached
def check_credit_limit(book)
throw(:abort) if limit_reached?
end
```
NOTE: These callbacks are called only when the associated objects are added or removed through the association collection:
```ruby