w3web.net -- trigger to check for duplicates

Trigger to check duplicate name to custom object in Salesforce

Hey guys, today in this post we are going to learn about How can we prevent duplicate name insert on custom object in Salesforce.

Real time scenarios:- Write a trigger on custom object When a Object (childObjTrigger__c) is being created, if a record exists with the same EmployeeName (EmployeeName__c), the trigger should throw an error.

Create a custom object with custom field name as EmployeeName

Custom Object:- childObjTrigger__c >> custom field:- EmployeeName__c (Text
type)

Files we used in this post example:-

childTriggerhandler.apxt Apex Class Trigger It is used for prevent duplicate record creation with same name
childObjHandler.apxc Apex Class Handler It is call into cildTriggerhandler.apxt file.

Custom Child Object:- childObjTrigger__c

Custom Field:- EmployeeName__c

Custom Child Object with Custom Field It is custom object with custom field used for display an error if same name being inserted.

You can download file directly from github by click here

Final Output

w3web.net -- trigger to check for duplicates

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Step 1:- Apex Class Trigger : childTriggerhandler.apxt

From Developer Console >> File >> New >> Apex Trigger

childTriggerhandler.apxt [Apex Class Trigger]

Step 2:- Apex Class : childObjHandler.apxc

From Developer Console >> File >> New >> Apex Class

childObjHandler.apxc [Apex Class Handler]

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