3.1.2 - Integrity Restrict Delete

Integrity Restrict New Feature : Restrict delete of an item when this item is referred by another item.

For using it, simply open the properties of a FK field, and then choose 'Restrict' in the 'FK Integrity' option.

In the following example, if you try to delete China (country), the system will refuse and tell you the related cities:
Integrity Restrict

Just wanted to congratulate you on the J-Cook website / web development tool. In a couple of visits I've had a play around with Cook and have to say I think it is fantastic.  I've played with a number of component builders in the past and yours is certainly looking like the best so far. I'd also like to help you spread the word - I'm really surprised more people aren't excited about this tool. Good luck with the project.
Dean

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