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We have a custom object program__c. We have a lookup field on the Tasks object to program under 'Related To'.

Below is my current query. Program__c is pulling the program code, but I want the program Name. I've tried program__c.name and program__r.name but it does not work (see errors below). The 'field name' of the Program Name on the Program__c object is 'name'.

Current Code:

SELECT Salesforce_18_Digit_ID__c, firstName, lastName, email, phone, mobilePhone,
(SELECT program__r.name, Id, CreatedDate FROM Tasks) FROM Contact c

Error for program__c.name

[InvalidFieldFault [ApiQueryFault [ApiFault exceptionCode='INVALID_FIELD' exceptionMessage=' (SELECT program__c.name, ^ ERROR at Row:11:Column:9 Didn't understand relationship 'program__c' in field path. If you are attempting to use a custom relationship, be sure to append the '__r' after the custom relationship name. Please reference your WSDL or the describe call for the appropriate names.' extendedErrorDetails='{[0]}' ] row='11' column='9' ] ]

Error when using program__r.name

[InvalidSObjectFault [ApiQueryFault [ApiFault exceptionCode='INVALID_TYPE' exceptionMessage='sObject type 'Tasks' is not supported. If you are attempting to use a custom object, be sure to append the '__c' after the entity name. Please reference your WSDL or the describe call for the appropriate names.' extendedErrorDetails='{[0]}' ] row='-1' column='-1' ] ]

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  • I m guessing Program__c has a Lookup field to Task, but this is not clear in your question. Please edit your question to add details of the object model. – Phil W Sep 16 '20 at 21:15
  • Also, please don't just repost a question. You should have simply edited the previous one to clarify why the original isn't a duplicate question. – Phil W Sep 16 '20 at 21:17
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    Are you saying that your Tasks are related to custom objects through the out-of-the-box Related To relationship, whose API name is WhatId? – David Reed♦ Sep 16 '20 at 23:32
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It seemed to work fine for me.

I had a plain custom object called Program. To which I created a Lookup relationship from Activity. The API name for that relationship was DFB__Program__c for me (I have the namespace DFB in the org I tested with).

enter image description here

The following SOQL query found a test Task on a Contact and the corresponding related Program for that Task. Note the __r relationship suffix on the lookup fields API name.

 Select Id, (Select Id, DFB__Program__r.Name from Tasks) from Contact

enter image description here

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