Error: Invalid field 'size' for SObject 'OpportunityLineItem'

Question

I would like to check the size of the OpportunityLineItem related list in a Visualforce Email Template like below, where relatedTo is an Opportunity

<apex:outputPanel rendered="{!relatedTo.OpportunityLineItems.size != 0}">

But I get error:

Error: Invalid field 'size' for SObject 'OpportunityLineItem'.

What is the correct way to achieve this?

Answer 1

You won't be able to get the size directly in visualforce email template, for that you will have to use the repeat tag to get the count and then you can build further logic based on that variable.

<apex:variable var="sizeOfOpportunityLineItem" value="{!0}"/>
<apex:repeat value="{!relatedTo.OpportunityLineItems}">
    <apex:variable var="sizeOfOpportunityLineItem" value="{!sizeOfOpportunityLineItem + 1}"/>
</apex:repeat>
Number of Opportunity Line Items : {!sizeOfOpportunityLineItem}

Answer 2

Look like your OpportunityLineItems is an OpportunityLineItem instead of a List.