2008-04-12
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:dependent => :delete_all vs :destroy_all

:delete_all is much faster than :destroy_all, it doesn't trigger any destroy callbacks on the associated object.        :destroy_all iteratively call the associated objects's destroy method
2008-04-12
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Reloading the Association

关键字: rails
Notice that the second time I invoke the association via user, the object_id remains the same. The related object has been cached. However, passing true to the accessor reloads the relationship and I get a new instance. >> ts = Timesheet.find :first => #<Timesheet:0x3454554 @attributes={“updated ...
2008-04-12
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The difference between << and create

关键字: rails
1. << is transactional, create is not 2. << method triggers the :before_add and :after_add callbacks, but the create method does not 3. << method returns operation_success ? association_proxy : false, while the create method returns the new instance created.
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