The Tooling API is great - very easy to use from Apex code by making HTTP calls containing straightforward JSON.

Two questions:

  1. Is it still not possible to create a new SObject type e.g. MyNewCustomType__c?
  2. Can a custom field be added to an already existing SObject type?
    • the CustomField documentation lists POST that makes me think the answer is "yes"
  1. You still cannot create Custom Object with REST API, only with METADATA API.
  2. Yes, you can create a Custom Field on existing sObject, request example:
HttpRequest request = new HttpRequest();
request.setHeader('Authorization', 'Bearer ' + UserInfo.getSessionID());
request.setHeader('Content-Type', 'application/json');

String fieldLabel = 'New_Label';
String objectAPIName = 'Account';
String fieldAPIName = fieldLabel + '__c';

request.setBody('{"Metadata" : {"type" : "Text","description" : "", "inlineHelpText" : "","precision" : null,"label":"' + fieldLabel + '","length" : 255,"required" : false}, "FullName" : "'+objectAPIName+'.'+fieldAPIName+'"}');

Http http = new Http();
HTTPResponse res = http.send(request);
  • 1
    That's helpful - thank-you. In fact I want to create a fake object as part of the CI build, so given your answer, I'll use sfdx force:source:deploy of a separate folder containing the object definition instead.
    – Keith C
    Mar 4 '20 at 10:57

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