Hi Friends,

I need help in completing below trigger.
I have a requirement, Two custom objects Obj A and Obj B which Obj A is Parent and Obj B is child. I am creating a child record based on daysbetween two dates Start Date and End Date in Parent object. This is working fine.
Now, If I edit the end date 
Eg: Start Date = 20/03/2020 and End Date = 22/03/2020. Daysbetween = 3. I will create 3 records in child Obj.
I am editing End Date = 25/03/2020.
Now Daysbetween = 6.
I want to create 3 more records. 
If I delete a date. Eg: End Date = 21/03/2020. Daysbetween = 2. I want to delete 1 record in child obj.
 

trigger insertDailyPractices on Study_Plan__c (after insert) 
{
    System.debug('--- Inside Trigger ---');
    List<Daily_Practice__c> dplist = new List<Daily_Practice__c>();    
    
    for(Study_Plan__c sp : Trigger.New)
    {
        if(String.isNotBlank(sp.Phase_Start_Date__c) && String.isNotBlank(sp.Phase_End_Date__c) {

            Integer daycount = sp.Phase_Start_Date__c.daysBetween(sp.Phase_End_Date__c);
            
            System.debug('--- Inside For Loop ---' + sp.Phase_Start_Date__c);
            System.debug('--- Day Count ---' + daycount);
     
            for(integer i=0; i<=daycount; i++)
            {
                Daily_Practice__c dps = new Daily_Practice__c();
                dps.Due_Date__c = sp.Phase_Start_Date__c.addDays(i) + 1;
                dps.StudyPlan__c = sp.Id;
                dps.Status__c = 'Assigned';
                dplist.add(dps);
            }    
        }
    }
    
    if(dplist.size() > 0)
    {
        insert dplist;
    }    
    system.debug('--- Inserted Daily Practice ---'+ dplist.size());
}

Let me know your suggestions to complete this requirement.

Thanks in advance.

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