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Account acc = new account(name='Rahul');
insert acc;
account acc1 = acc.clone();
insert acc1;
Account accc = [select id from account where id =: acc1.id];
system.debug(accc.isClone());//Supposed to display true
But it is being displayed as False. It is supposed to show true as acc1(accc) is a clone of acc.
The purpose of isClone is to validate records in memory, not in the database.
Account acc = new Account(Name = 'Acme');
insert acc;
Account clonedInMemoryAccount = acc.clone();
// Test before committing to DB
System.assertEquals(true, clonedInMemoryAccount.isClone());
insert clonedInMemoryAccount;
Account databaseAccount = [
select id
from Account
where id = :clonedInMemoryAccount.Id];
System.assertEquals(false, databaseAccount.isClone());
In this scenario you can see the difference in the two assertions and how you should expect to use isClone from the SObject class.
isClone()method will only return true for SObject that are clones in memory. So becauseacccis an actual record, loaded from the database,isClone()will return false. If you need this functionality, you will have to keep track of the fact that a record is cloned using a custom field and, for instance, a workflow (see help.salesforce.com/…)