We use Visualforce binding to display results from different object queries based on user selection. An admin can dynamically define the query we run so Visualforce binding is perfect for this.

Our code has broke in Summer 11. We get errors whenever results for a different object are retrieved. The new field change does not appear to be respected by Visual Force.

I was able to write the following test code to illustrate. When you run you will see 10 accounts in your org. Now change the dropdown to contacts, and you see a binding error.  It looks like Visualforce isn’t refreshing the QueryViewDisplayFields as expected. As mentioned, this functionality worked before but is broken in the Summer release.  If you change the selected option to ‘Contacts’ in the constructor, you’ll see that the contacts display fine. Now if the user changes the options to accounts the binding breaks.

<apex:page controller="BindingTest">
<apex:form >

<apex:outputLabel dir="" value="Showing: " />
                &nbsp;&nbsp;&nbsp;
<apex:selectList multiselect="false" value="{!SelectedOption}" size="1">    
        <apex:selectOptions value="{!OptionsList}" id="recordOptions" />
        <apex:actionSupport event="onchange" status="counterStatus"
            oncomplete="ReadData();" rerender="none"  />                
</apex:selectList>

<apex:actionFunction name="ReadData"
    action="{!ReadData}" rerender="SearchResults" />

<apex:pageBlock id="SearchResults" >
     
        <apex:pageblocktable value="{!QueryViewRecords}" var="viewRow">

        <apex:repeat value="{!QueryViewDisplayFields}" var="myfield" id="innerset">
        <apex:column value="{!viewRow[myfield]}" />
        </apex:repeat>
                                        
        </apex:pageblocktable>                

</apex:pageBlock>

</apex:form>
</apex:page>

public with sharing class BindingTest
{
    public String SelectedOption {get; set;}

    public List<SelectOption> OptionsList {get; set;}
    public List<SObject> QueryViewRecords {get; set;}
    
    public List<String> QueryViewDisplayFields
    {
        get
        {
            List<String> returnResults = new List<String>();    
            
            if( SelectedOption == 'Accounts' )
            {            
                returnResults.add('name');
                returnResults.add('phone');
                returnResults.add('annualrevenue');
            }
            else
            {            
                returnResults.add('firstname');
                returnResults.add('lastname');
            }

            return returnResults;            
        }
    }
    
    public BindingTest()
    {
        OptionsList = new List<SelectOption>();
        OptionsList.add(new SelectOption('Accounts', 'Accounts'));
        OptionsList.add(new SelectOption('Contacts', 'Contacts'));
        
        SelectedOption = 'Contacts';
        ReadData();
    }

    public void ReadData()
    {
         if( SelectedOption == 'Accounts' )
         {
             QueryViewRecords = [select name, phone, annualrevenue from account limit 10];
         }
         else
         {
             QueryViewRecords = [select firstname, lastname from Contact limit 10];         
         }
    }
}