I have a class that is correctly pulling an AggregateResult in from a child object on a custom object. I'd like to use an pex:pageBlockTable to display the aggregateResults but when trying to setup the header I get an error.

This works per system debug checks:

    public List<AggregateResult> getAggregateList(){
            Parent_Custom_object__c TheCS = (Parent_Custom_object__c)sc.getRecord();
            List<AggregateResult> AggResults = new List <AggregateResult>();

         AggregateResult[] aggQuery = [select
     zone__c zone,
      from Custom_Child_object__c 
      where Parent_of_Custom_Child_object__c =:TheCS.id
      GROUP BY zone__c    

         for(AggregateResult QAR:aggQuery)

Visualforce page:

<apex:pageBlock title="AggregateList">   

     <apex:pageBlockTable value="{!AggregateList}" var="d" id="Zone" title="Aggregate"> 
     <apex:column value="{!d.Zone}" headervalue="Zone" ></apex:column>

Error: Error: Invalid field Zone for SObject AggregateResult


You can only use the dot-notation for "concrete" fields (fields that can be verified through metadata). For example, {!Account.Name} is valid, because the system can verify that Account.Name is a real field. However, AggregateResult is a dynamic object. As such, you need to use the "dynamic" syntax:

<apex:column value="{!d['Zone']}" headerValue="Zone" />

The [field] notation allows you to use a string variable to dynamically access a field that may or may not exist on an sObject or AggregateResult variable.

| improve this answer | |
  • Hmm I am still getting the same error. – jaw999 Nov 11 '19 at 20:33
  • @jaw999 I believe it may be case-sensitive? Make sure the alias and the "field name" match in case. – sfdcfox Nov 11 '19 at 20:36
  • I have matched case and it still shows the same error, <apex:column value="{!d['zone']}" headerValue="zone" /> produces Error: Invalid field zone for SObject AggregateResult – jaw999 Nov 11 '19 at 20:56
  • I tried using the facet idea per this post but I didn't render alokagrawal.com/blog/archives/74 – jaw999 Nov 12 '19 at 14:21
  • OK, not sure what my error was but this is working now, thanks! @sfdcfox – jaw999 Nov 13 '19 at 20:30

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