Default values for new class attributes

Hi,

I just wonder how to specify a default value for new attributes added to existing class.

Imagine, a class holding a number and a string (version 1).

In version 2, I want to add a bool value to this class, but I don't want the existing records to be updated with the boolean default value.

I use the VSchema to update my customers databases, so that I don't have to deliver the sql script.

Any idea?

Thanks,

Antoine.

Hello Saene,

You can use nullable boolean (bool?) field. Then the old records in the database will get a NULL value in that column instead of a zero. This way you will be able to distinguish between records from version 1 and 2. If you do not want to use nullables, you can create a custom script and have a table column that allows nulls (so the old records will have null there), but in that case the loaded objects will have value false instead of NULL. I think it is better to use nullable booleans.

Kind regards,
Alexander
the Telerik team