validateWrite() - form data source methods - in D365 F&O

Question

Accepted Answer

The validateWrite() method is a standard method of a form data source, which is called when a user attempts to save a record to determine whether data is valid and ready to be written.
Example
You have a custom form with a table named TrainingMaster. The table has a date field named TrainingDate. No backdated training data should be allowed.
The following code pattern can be a way to achieve this result:



[DataSource]
class TrainingMaster
    {
        public boolean validateWrite()
        {
            boolean ret;
        
            ret = super() && (TrainingMaster.TrainingDate >= today());
        
            return ret;
        }
    }




Note
You don&rsquo;t want to let the validateWrite() method fail without a message regarding why. A best practice would be to throw an error with a specific message rather than using the Boolean return of the if statement.

validateWrite() - form data source methods - in D365 F&O

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