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gaurav arora 33gaurav arora 33 

Apex Metadata API for Field History Tracking

Hi,

We have  and automated code for updating the page layout through Apex Metadata API for example in like in below link.
https://trailhead.salesforce.com/modules/apex_metadata_api/units/apex_metadata_api_updates

Can we have some similar code for enabling the field history tracking of some fields.

Thanks
 
Saroja MuruganSaroja Murugan
Hi,

We can do it using Custom Object and Trigger not with the Standard History Tracking.

Step 1:
       Create an object with the name History Tracking

User-added image

Step 2:
       Create a Trigger on object where you want to track fields.

Below is the sample code:

trigger CampaignMemberAfterTrigger on CampaignMember (after insert, after update) {
    List<History_Tracking__c> hisTrackList = new List<History_Tracking__c>();
    //
    // Iterate through the CampaignMembers and create the History Tracking Record.
    //
    for (Integer i=0; i < Trigger.new.size(); i++) {
        
        CampaignMember newCM = Trigger.new[i];
        if(Trigger.isInsert) {
            hisTrackList.add(new History_Tracking__c(CampaignMember_Record_Id__c = newCM.Id,
                                                    Object_Name__c = 'CampaignMember', 
                                                    Field_Name__c = 'Status',
                                                    Previous_Value__c = '',
                                                    Current_Value__c = newCM.Status,
                                                    Modified_Date_Time__c = System.now(),
                                                    Modified_By__c = UserInfo.getUserId()
                                                    ));  
        } else if(Trigger.old[i].Status != newCM.Status){
            CampaignMember oldCM = Trigger.old[i];            
            hisTrackList.add(new History_Tracking__c(CampaignMember_Record_Id__c = newCM.Id,
                                                    Object_Name__c = 'CampaignMember', 
                                                    Field_Name__c = 'Status',
                                                    Previous_Value__c = oldCM.Status,
                                                    Current_Value__c = newCM.Status,
                                                    Modified_Date_Time__c = System.now(),
                                                    Modified_By__c = UserInfo.getUserId()
                                                    ));
        }
    }
    if(!hisTrackList.isEmpty()) {
        insert hisTrackList;
    }
}

Thanks,
Saroja
SweetPotatoTec