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Unique attribute in an entity (Core Data)

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Unique attribute in an entity (Core Data)

Subject: Unique attribute in an entity (Core Data)
From: "Tony S. Wu" <email@hidden>
Date: Fri, 17 Jun 2005 15:13:03 +0800

i have an attribute in an entity that i want to leave unique.

so i subclass NSManagedObject, and in -validateKey: error: function i do a fetch and determine if the attribute exists in the entity or not.

is this a good solution?

if the entity already exists, what error should i return?

also, if this entity is related to another entity on a to-many relationship, is it better to create an attribute on that other table to hold an ID, instead of using a reverse relationship?

thanks.

Tony S. Wu

email@hidden

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