Duplicate Prevent Lead Based On Email

Requirement: Write a trigger to prevent duplicate Email on Lead Object

Solution:


trigger leadDuplicatePreventer on Lead (before insert, before update) {
Map<String, Lead> leadMap = new Map<String, Lead>();
for (Lead lead : System.Trigger.new) {
if ((lead.Email != null) &&
    (System.Trigger.isInsert || (lead.Email != System.Trigger.oldMap.get(lead.Id).Email))) {
if (leadMap.containsKey(lead.Email)) {
  lead.Email.addError('Another new lead has the ' + 'same email address.');
} else { 
    leadMap.put(lead.Email, lead); 
}
}
}
for (Lead lead : [SELECT Email FROM Lead WHERE Email IN :leadMap.KeySet()]) {
Lead newLead = leadMap.get(lead.Email);
newLead.Email.addError('A lead with this email ' + 'address already exists.');
}
}

                             Thanks,
                           Sumit Shukla

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