Apex Trigger (Prevent Multiple Primary Contact Creation)

It explains about how to write a trigger for the following scenario.
An shouldn't have more than 1 primary contact.
It should handle on both insert and update on contact.
References:
developer.sale...
developer.sale...
trailhead.sale...

[@krishnaCasukhela]

Hello , I tried this code in my local org. The update functionality is not working as expected..

[@poornarao6554]

Nice video.. Can you please make the video on Maps by giving more examples

[@COLI-UK]

This is amazing, just what I was looking for. But can you implement this without code? Using flows would be ideal for me. Thanks🙏

[@salesforcetechbook]

Mostly yes. Check this one please help.salesforce.com/s/articleView?id=release-notes.rn_automate_flow_builder_create_custom_error_messages_in_record_triggered_flows.htm&release=246&type=5

[@sherba-ig]

How to create a test class for this same scenario?

[@vishnuvardhana2683]

Hi sir - instead of using accountIdSet which stores all accounts' ids with isprimary__c = true and accountid != null can we just use following condition in SOQL which would also satisfy this condition (above) and put values into accountIdContactMap?: for(Contact contObj : [Select id, IsPrimary__c,AccountId from Contact where IsPrimary__c = true and AccountId null]){ accountIdContactMap.put(contObj.AccountId,contObj); } Please advise

[@payeldebku]

very good video

[@Patrickens_Tw]

Please also share the code file for reference.

[@salesforcetechbook]

Hi Pratik, You can get all examples source in Salesforce Techbook GitHub github.com/salesforcetechbook/ExampleCodesofSessions You can figure out this in the first slide of video