How do I update Custom Label's value using apex? Which one would be a better option metadata api or tooling api? Please provide example

Question

I'am working on post deployment automation process in salesforce. I am stuck on how should I update values in custom labels which needs tobe updated manually after a sandbox refresh.

Answer 1

You can use this MetadataService class and follow this example:

public static void updateField()
{
    MetadataService.MetadataPort service = createService();
    MetadataService.CustomField customField = new MetadataService.CustomField();
    customField.fullName = 'Test__c.TestField__c';
    customField.label='New Test Field Label';
    customField.type_x = 'Text';
    customField.length = 52;
    List<MetadataService.SaveResult> results =
        service.updateMetadata(
            new MetadataService.Metadata[] { customField });
    handleSaveResults(results[0]);
}

In your case, you will probably want to use only the fullName and label attributes. Type and length are not relevant for you to set here.

More on how to handle the save results can be viewed in the example class at line 1536.