0

I have a custom object A, that has a currency field and has a look-up relationship to object B.

Now within object B, I am trying to access the value of the currency field of object 'A'. What is the best way to define a field to capture that calue?

I tried to use a currency type field and performed 'objectA__C.Cost__A', but got an error stating field 'objectA__C' does not exist.

| improve this question | | | | |
  • did you try objectA__r.Cost__A? – m Peixoto Nov 4 '19 at 15:50
  • Thanks Peixoto. Doesnt work :-(. – Spiderman Nov 4 '19 at 15:59
  • 1
    Which object is the parent, and which is the child? The child object is the one that contains the actual relationship field. E.g. Opportunity is a child object of Account because the Opportunity object has the relationship field AccountId. – Derek F Nov 4 '19 at 16:03
  • Also, are you trying to get at this value (these values?) via a formula field/workflow/etc..., or via a trigger? – Derek F Nov 4 '19 at 16:15
  • Thanks Derek and Phil, I am trying to get the values via formula field and not trigger. I am trying to avoid writing triggers to be honest. – Spiderman Nov 4 '19 at 16:17
3

Salesforce automatically creates Child Relationships (effectively "reverse relationships") when you create a lookup field. Where you have a relationship between A__c and B__c having a lookup field on A__c you get the child relationship defined too. The specific name of this relationship is set when you define the lookup field.

So, with A__c having field "Some_B__c" as a lookup to "B__c" you can query the B object and get its related A's like:

SELECT Id, ..., (SELECT Id, Currency_Field__c FROM A__r) FROM B__c WHERE Id = :someId

This will load your B__c instance such that you have an ARRAY of A__c instances (all A__c instances that reference the given B__c instance) that you can access and get the currency field from using something like:

for (B__c b : [SELECT ... ]) { // Using the select from above you will get one match
    for (A__c a : b.A__r) {
        Currency c = a.Currency_Field__c;
        ... // Do something with the related A__c's currency
    }
}
| improve this answer | | | | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.