salesforce - URLFOR misbehaving with Image attachment? -


trying simple getting strange results. have image stored attachment want display in vf page.

if works fine

 <apex:image  url="{!urlfor($action.attachment.download,'00pr0000008q3ymmak')}"/>

however testing purposes hardcoded id. if try reference id in object fails. though value contained in object same above.

 <apex:image  url="{!urlfor($action.attachment.download,model.previewimageattachid)}"/>

when load page error in urlfor param!!!

i thought problem because model.previewimageattachid string , not id created wrapper return id - same error. decided salesforce must have strange requirement can pass in real object did , passed in model.attach.id , still fails!!

please can explain me , more importantly suggest solution??!?

once again if output page

{!model.previewimageattachid} 00pr0000008q3ymmak

so cant explain this!

thanks!

my bad...

was using apex:repeat , turns out of id values null. hence error


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