Dynamically create TopicsForObjects metadata from Apex

Question

Whenever I am unable to package a certain metadata type in a Managed Page I created them from a Setup page after installation using the Metadata API and this neat Apex Wrapper lib.

But this time I seem to be out of luck. The TopicsForObjects metadata type is not covered by this lib. Any other way to do it (simpler)? Without manually patching the lib?

Answer 1

I see TopicsForObjects in apex-mdapi. This is the below snippet from their code and taken from what's available in their github.

public class TopicsForObjects extends Metadata {
        public String type = 'TopicsForObjects';
        public String fullName;
        private String[] fullName_type_info = new String[]{'fullName',SOAP_M_URI,null,'0','1','false'};
        public Boolean enableTopics;
        public String entityApiName;
        private String[] enableTopics_type_info = new String[]{'enableTopics',SOAP_M_URI,null,'1','1','false'};
        private String[] entityApiName_type_info = new String[]{'entityApiName',SOAP_M_URI,null,'1','1','false'};
        private String[] apex_schema_type_info = new String[]{SOAP_M_URI,'true','false'};
        private String[] type_att_info = new String[]{'xsi:type'};
        private String[] field_order_type_info = new String[]{'fullName', 'enableTopics','entityApiName'};
    }

I was also able to update the TopicsForObjects record for a given object that was disabled. I successfully flipped it to "enabled".

MetadataService.MetadataPort service = new MetadataService.MetadataPort();
service.SessionHeader = new MetadataService.SessionHeader_element();
service.SessionHeader.sessionId = UserInfo.getSessionId();
List<String> objectNames= new List<String>{'Account_Group__c'}; //add your objects api name here

//Get TopicForObject metadata records
List<MetadataService.TopicsForObjects> topicForObjectRecs = (List<MetadataService.TopicsForObjects>) service.readMetadata('TopicsForObjects', objectNames).getRecords();

//enable topics for given object
topicForObjectRecs[0].enableTopics = true;

//update metadata
List<MetadataService.SaveResult> results =
        service.updateMetadata(
                new MetadataService.Metadata[] { topicForObjectRecs[0] });