How to force lead assignment rule via Apex while updating or adding the Lead

How to force lead assignment rule via Apex while updating or adding the Lead

To enforce Assignment Rules in Apex you will need to perform following steps:

Instantiate the “Database.DMLOptions” class.

Set the “useDefaultRule” property of “assignmentRuleHeader” to True.

Finally call a native method on your Lead called “setOptions”, with the Database.DMLOptions instance as the argument.

Example:

// to turn ON the Assignment Rules in Apex

Database.DMLOptions dmlOptn = new Database.DMLOptions();

dmlOptn.assignmentRuleHeader.useDefaultRule = true;

leadObj.setOptions(dmlOptn);