Apex trigger to count child records -- w3web.net

Apex trigger to create and count the number of child records associated with parent object based on custom field when parent record is created/updated in Salesforce | Count the number of child record using trigger in Salesforce

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Hey guys, today in this post we are going to learn about Apex trigger to create and count the number of child records associated with parent object based on custom field when parent record is created/updated in Salesforce.

Real time scenarios:- Write a trigger on parent object where create a custom field as Employee (Number type).

If user insert the parent record, the child record should be automatic inserted equal to the same value of employee.

Or if user update the value of employee less then the total number of child records, in this case the child records should be exist only equal to value of employee size, rest records of child object should be automatic removed.

Files we used in this post example

EmployeeSizeTrigger2.apxt Apex Class Trigger It will be fired whenever insert or update a record on parent object

Parent Cusotm Object:- parentObjTrigger__c

Custom Field:- EmployeeName__c

Parent Object with Custom Field Trigger on parent object and updae the count of related child records with the custom field value of parent object.

Child Custom Object:- childObjTrigger__c

Custom Field:- childLookup__c : Lookup(parentObjTrigger)

Child Object with Custom Field childLookup__c : Lookup(parentObjTrigger) field it is help to communicate on parent object.

Live Example

Trigger to update parent object value -- w3web.net

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Step 1:- Apex Class Trigger : EmployeeSizeTrigger2.apxt

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

EmployeeSizeTrigger2.apxt [Apex Class Trigger]

 

Apex trigger to count child records -- w3web.net

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FAQ (Frequently Asked Questions)

How do you handle errors in Apex class?

Apex uses the try, catch, and finally block to handle an exception. You “try” to run your code and if an exception occurs you catch it and write the code to handle it in the “catch” block. You write the code that must execute whether an exception occurs or not in the final block.

How do I run an Apex class in developer console?

Follow the steps to execute apex code in developer console. Now go to Debug=>Open execute anonymous window. Use CTRL + E shortcut to open window to execute apex code. Now click on execute button.

What is Apex test class in Salesforce?

The Apex testing framework enables you to write and execute tests for your Apex classes and triggers on the Lightning Platform. Apex unit tests ensure high quality for your Apex code and let you meet requirements for deploying Apex.

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