How to Assign Task to the User which is located in the Picklist?

Question

i have one requirement regarding Create task Automatically based on the Picklist value and that Picklist value Have some users..

• Opportunity.PICK__c = User1, User2, User3, User4 ..........

• When this Opportunity saved then Automatically Task has to be created with the Assignee of this User (Opportunity.PICK__c)..

• this is working with the Workflow rule but it's a Static and i want it be to working with Dynamically

• just because of in the future if User's are more than 100 then.....

Please Help me out....

Thanks a LOT !!

Answer 1

I coded and tested a apex trigger according to your use case. Hope its help.

    trigger TaskUpdate on Opportunity (After insert,After update) {

//loop through all new opportunities  saved
List<task> tl= new list<task>();
Task T = new Task();
List<User> ul=[Select Id,Name from User];
If(Trigger.IsInsert)
{

    for(Opportunity Op: Trigger.new)
    {

        T.Type = 'Email';
        T.Description = 'DEMO String';
        T.Priority= 'Low';
        T.Subject='demo subject';
        T.Status='Not Started';
        String userN = Op.PICK__c;
        for(integer i=0;i<ul.size();i++)
        {
            If(ul[i].Name == userN )
            {
                T.OwnerId = ul[i].Id;
            }
        }
        //    T.OwnerId = [Select Id from User where Name =:userN Limit 1].Id;
        T.WhatId = Op.Id; 
        tl.add(T);
    }
 insert tl;    
}
If(Trigger.IsUpdate)
{
    // Optional if you want to change assign task owner is picklist vlaue is change.
}
}

You can code what to do in update condition according to your use case.