I'm brand new to Apex and I'm having some trouble displaying aggregate results in a visualforce page. The extension isn't throwing any errors but the visualforce says "Error: Invalid field cv__Opportunity__c for SObject AggregateResult".

The way I read this is, either I'm not calling the fields properly in the visualforce page, or I'm not presenting the aggregate properly in the extension. Any help is of course greatly appreciated!

Here's the extension:

public class AccountDesignationHistoryExtension {
    
    Account CurrentAccount = null;
    List<AggregateResult> AccountDesignationHistory = null;
    
    public AccountDesignationHistoryExtension(ApexPages.StandardController controller) {
        CurrentAccount = (Account)controller.getRecord();
        AccountDesignationHistory = [SELECT COUNT(cv__Opportunity__c), Designation_Name__c, SUM(cv__Amount__c), MAX(Close_Date__c)
        From cv__Donation_Designation_Relationship__c
        WHERE cv__Opportunity__r.AccountId = :CurrentAccount.Id
        AND cv__Opportunity__r.StageName = 'Received'
        AND cv__Opportunity__r.cv__Posted__c = False
        GROUP BY Designation_Name__c];
    }
    
    public List<AggregateResult> getAccountDesignationHistory() { return AccountDesignationHistory; }
    
}

Here's the visualforce:

<apex:page standardController="Account" extensions="AccountDesignationHistoryExtension">
    <apex:pageBlock >
        <apex:pageBlockTable value="{!AccountDesignationHistory}" var="a">
            <apex:column value="{!a.cv__Opportunity__c}" headerValue="Number of Donations" />
            <apex:column value="{!a.Designation_Name__c}" headerValue="Designation Name" />
            <apex:column value="{!a.cv__Amount__c}" headerValue="Total Designated Amount" />
            <apex:column value="{!a.Close_Date__c}" headerValue="Most Recent Donation" />
        </apex:pageBlockTable>
    </apex:pageBlock>
</apex:page>

Hi, All

I have create trigger for  chatter notification on attachment  when file is upload

but getting error like

Error: Apex trigger ChatterNotification caused an unexpected exception, contact your administrator: ChatterNotification: execution of AfterInsert caused by: System.DmlException: Insert failed. First exception on row 0; first error: INVALID_OR_NULL_FOR_RESTRICTED_PICKLIST, Feed Item Type: bad value for restricted picklist field: file:

Plaese suggest me any idea !! or otherr way to chatter notification when attach file !!

Please Help me ASAP

Thank you,

Piyush Parmar