I have a Junction object name AcctContactAff which creates a many-to-many relationship between Contacts and Accounts and stores (among other things) the title of the person at the account.

AcctContactAff - Contact - Account - Title

Being new to SOQL I am really struggling to get the following to work:

SELECT Id, Name, NPI__c, 
    (SELECT Title__c FROM AcctContactAff__r) 
FROM Contact

When I run this I get the error message: "Didn't understand relationship 'AcctContactAff__r' in FROM part of query call."

I can get the query to work when I do this:

SELECT Contact__r.id, Contact__r.Name, Title__c, Name 
FROM AcctContactAff__c

But I need to run the query from the Parent not the Child object.

Can anyone tell me what is wrong with the first query statement?


You can find the name of the ChildRelationship as follows:

for (ChildRelationship relation : SObjectType.Contact.getChildRelationships())
    if (relation.getChildSObject() == Contact.sObjectType)

Copy this value verbatim and replace AcctContactAff__r in your original query. Often it's pluralized so I would expect the actual name to be AcctContactAffs__r, but you should run the script above in Execute Anonymous to be sure.


You can go to the field's detail page, and you'll see the relationship name. Go to Setup > Customize > (Object) > Fields > (Field Name), or Setup > Create > (Object) > (Field Name), and you'll see the details. In the "Child Relationship Name" field, you'll see the name of the relationship. For custom lookup fields, you have to remember the __r.

Field Detail View

  • It won't give you a verbatim relationship name ever though, and also doesn't include the namespace.
    – Adrian Larson
    Aug 5 '16 at 1:18

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