Is there a way to access both before- and after- document metadata during a documentModified handler?
I have a multivalue metadata element on my custom document type. I would like to run code when this information changes, but I need to know which items were added or removed from the list of elements in order to run this code.
Simplified examples:
- Document contains ['item1'] - user adds 'item2' to this list and clicks Save. My handler runs and sees that the value has changed from ['item1'] to ['item1', 'item2'] for this element. It performs work for the new 'item2'.
- Document contains ['item1', 'item2'] - user removes 'item1' from this list and clicks Save. My handler runs and sees that the value has changed from ['item1', 'item2'] to ['item2']. It performs work for the old 'item1'.
There must be several ways to implement this, but it is a simple enough concept that I think there must be a “best” way in the general case. Could someone give a general outline or a pointer to existing code/documentation that handles metadata changes on documentModified?
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Steven Huwig
Member (2.3K) 3 5 6 |
11/20/2013 ( History) |
The better answer is to use the previous document that's already provided to you in the event context for a beforeDocumentModification:
DocumentModel oldDocument = (DocumentModel) context.getProperty(CoreEventConstants.PREVIOUS_DOCUMENT_MODEL);
if (oldDocument != null) {
// beforeDocumentModification
title = oldDocument.getTitle();
// ...
}
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Florent Guillaume
Member (36K) 6 8 8 |
05/02/2014 ( History) |
The answer to this question is to hook into the “before document modification” and retrieve the document from the repository.
public String run(DocumentModel input) throws ClientException {
DocumentModel oldDocument = session.getDocument(input.getRef());
// ...
}
In the above method, “input” contains the new values and “oldDocument” contains the old values.
My original question assumed “documentModified” was the correct event, but it was not.
edit: see the better answer.
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Steven Huwig
Member (2.3K) 3 5 6 |
05/01/2014 ( History) |
You can have access to the origninal document model (the one containing old values, not the one being modified) with:
@{Document.getRef().reference()}
input.getCoreSession().getDocument(input.getRef()) seems to get the same metadata as is on input during documentModified.