Ruby on Rails

unknown wrote in post #1137005:
> Yes I know I can set :dependant => :delete_all
>
> but what's resoning behind this default behaviour? Is it just a legacy
> stuff?

> anyone knows why the default behaviour here is to nullify keys?

Actually, the Rails documentation explains this rather clearly, so the
behavior you're seeing is exactly as it was intended.

Excerpt:

delete_all()
Deletes all the records from the collection. For has_many associations,
the deletion is done according to the strategy specified by the
:dependent option. Returns an array with the deleted records.

If no :dependent option is given, then it will follow the default
strategy. The default strategy is :nullify. This sets the foreign keys
to NULL. For, has_many :through, the default strategy is delete_all.

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