Modeling: User's Guide

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3.3.2 Checking constraints: key by key

To verify a given value for a specific attribute, say on lastName for a Writer object, you use the method validateValueForKey:

    aWriter.validateValueForKey('Cleese', 'lastName')

This check that the value 'Cleese' is a valid value for Writer.lastName. Note that this value is directly given as a parameter and is not stored, nor searched, within the object: the validation can thus be done without actually assigning the value to an attribute (but the ``global'' checks we'll see hereafter do not work that way).

• 3.3.2.1 Return code
• 3.3.2.2 How to define your own validation logic

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Modeling: User's Guide

Previous: 3.3.1 Integrity constraints derived Up: 3.3 Automatic validation of Next: 3.3.2.1 Return code

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Release 0.9, documentation updated on March 4, 2006.

Comments are welcome: Sebastien Bigaret / Modeling Home Page
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