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himanshu huske 7himanshu huske 7 

sfdc

Please help me with simple code...
A trigger that will prevent a user from creating a lead that already exists as a contact. We will use the lead /contact email address to detect duplicates.
Lead is created or updated.
Lead has an email address.
2. Try to find a matching contact based on email address.(Using SOQL)
If a match is found give an error
 If a match is not found do nothing
Best Answer chosen by himanshu huske 7
GovindarajGovindaraj
Hi Himanshu,

Try below code, 
trigger preventDuplicateLead on Lead (before insert) {
	set<string> setEmailId = new set<string>();
	for(Lead leadObj : trigger.new) {
		setEmailId.add(leadObj.email);
	}
	list<Contact> lstContact = [SELECT Email FROM Contact WHERE Email IN : setEmailId];
	map<string,Contact> mapContact = new Map<string,Contact>();
	for(Contact conObj : lstContact) {
		mapContact.put(conObj.Email,conObj);
	}
	for(Lead leadObj : trigger.new) {
		If(mapContact.containsKey(leadObj.Email)) {
			leadObj.addError('Already exist');
		}
	}	
}
I did this in notepad, apologies for any syntax error.

Let us know, if this helps.

Thanks,
Govindaraj.S