How to get the UUID of the FileDocument object stored in Amazon S3 ?

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How to get the UUID of the FileDocument object within Mendix which  is stored in Amazon S3 ?    
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2 answers
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FileDocument objects are stored in the Mendix database, so you can use the ‘getGUID” java action from the CommunityCommons module, just like any other object. When you retrieve a filedocument object, it's binary contents are automatically retrieved from the file storage.

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The GUID of a file document is stored in an internal data field. This field can be used to locate the files on disk. It can be accessed as follows:
 

String guid = (String) fileDocument
    .getMember(getContext(), "__UUID__")
    .getValue(getContext());

or
 

String guid = (String) fileDocument.getValue(getContext(), "__UUID__");

 

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