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Yelper DevYelper Dev 

Primary Contact - Contact Trigger Handler

Hello, Can anyone help me with the following requirements? The even of the trigger is before Insert.

[1] If there is no contact records on the Account, the new contact record should be automatically be the primary contact (Checkbox field)

[2] If 2 Account has no contact records, the 2 new contact records should be automatically be the primary contact.

[3] If the Account has already a contact record that is already a Primary, it should prompt an error message "Already has primary contact"

Contact Trigger:
trigger ContactTrigger on Contact (before insert, before update) {
    if(Trigger.isBefore){
        if(Trigger.isInsert){
             ContactTriggerHandler.doBeforeInsert(Trigger.new);
        }
         if(Trigger.isUpdate){
         ContactTriggerHandler.onBeforeUpdate(Trigger.new, Trigger.oldMap);
        }
    }
}
Thank you.