Process to verify if Business Object Exist - Do we use a Checker Object now?

[jhuerta3]

Hello all,
I have a question regarding the Exist function. Before we could create a business object(Info or edit) and call the Exist Command to see if the data exist in the database. I think that method is no longer used since the business object does not expose the Exist Command. I believe we now should use a Checker object(ReadOnlyBase). Is that the case? If so why is this a better method? Just curious.
Thank you.

[Chicagoan2016]

I have used command objects for 'Exists' pattern in Csla 4.xx, but I have also used another method in my objects that works perfectly fine with our SQL server database(s).
When I 'fetch' an object, I check for the property that corresponds to the Primary property (identity column) of the (main) table in the SQL server. If it's greater than zero, I know the fetch was successful. If not, I show the appropriate message to the user.
Our objects aren't 1-1 with SQL tables but we always have a 'main' table that corresponds to the object graph.

[jhuerta3]

Thank you @Chicagoan2016

[Chicagoan2016]

Glad to help