A CFWheels controller that outputs CSV data and sends a file to the user automatically

MailingLists.cfc

<cfcomponent extends="Controller" output="false">
<cfscript>  
  function init(){
    // Let CFWheels know what type of output this controller can 'provide'
    provides("html,xml,json,csv");
  }
  // I've removed all non-related methods for this sample
  function export(){
    if( !structKeyExists(params,"selection") ){
        mailinglist = model("MailingList").findAll(where="exported=0",select="id,emailAddress");
    }
    else{
        mailinglist = model("MailingList").findAll(select="id,emailAddress");
    }
    // now, loop over query and mark each email as exported
    if( !structKeyExists(params,"selection") ){
        for( i=1; i LTE mailinglist.recordCount; i=i+1 ){
            subscriber = model("MailingList").findByKey(mailinglist['id'][i]);
            subscriber.update(exported=1);
        }
    }
    // ah, here's where the magic happens :)!
    if(params.format == 'csv'){
        renderWith(data=mailinglist);
    }
  }
</cfscript>
</cfcomponent>