how to create child records on the basis of parent record field multiselect picklist

Question

how to create child records on the basis of parent record field multiselect picklist,if picklist have 1 value,create single child record.if picklist have 2 values,create 2 records of child

Answer 1

Here is an example with Account and Contact.

Let's say Account has MultiSelectPicklist__c which holds the values like this:

A1;A2;A3;A4

Then it will first create a List splitting the by ';' and then looping through the lstValues create a list on Contacts and then insert the Contact List.

Account acct = [Select Id, MultiSelectPicklist__c FROM Account WHERE Id = '<record Id>'];

String str = acct.MultiSelectPicklist__c;
List<Contact> lstCon = new List<Contact>();

if(str !=null)
{
    List<String> lstValues = str.split(';');
    for(String pkValue: lstValues)
    {
        Contact con = new Contact(AccountId = acct.Id, LastName='LastName ' + pkValue);
        lstCon.add(con);    
    }
    insert lstCon;
}