search for: dispatcherinstance1

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2006 May 10
4
validates_uniqueness_of and create atomicity
...ELECT on the underlying table attempting to ensure that a record with ID(s) specified in the validates_uniqueness_of statement is not already present, prior to the INSERT (or UPDATE). However, in between the SELECT and INSERT, an offending record might appear. example race condition scenario: A) dispatcherInstance1 is to perform a create on entity Foo, which has a validates_uniqueness_of B) dispatcherInstance2 is to perform a create on entity Foo with the same parameters as in A C) dispatcherInstance1 enters the validation code and performs its SELECT, it decides everything is OK D) dispatcherInstance2 ent...