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Different VF pages based on SOQL query

I am trying to create a VF page that is used to batch add records.  I have our "Special Event" record, on which there is a "Invite Members" button.  This button should add an "Attendance" record for each of a subset of members.  However, in the custom controller, I would like to verify that Attendance records have not been created yet.  If some exist, I would like to have a VF page pop up that asks if the user is sure of the selected action.  Otherwise, there should just be a validation page.


So how can I change which VF page shows up based on certain parameters in the custom controller?




You can place this check in a method in your controller and set a boolean variable therein.

Based on this boolean, you can then do the conditional processing!